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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_2a8acf7b-8114-44f7-adc7-82eecb4528b7_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total accumulated amortization of deferred leasing intangibles included in total assets</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember_5763c2de-5dbc-46aa-a933-89cd06194d55_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">309-313 Pierce Street [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember_label_en-US" xlink:label="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Nine to Three One Three Pierce Street [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">309-313 Pierce Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroNinetoThreeOneThreePierceStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:to="lab_fr_ThreeZeroNinetoThreeOneThreePierceStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeFiveThreePerryStreetMember_e798d59d-de94-479e-b8d0-9d2f3e133ae0_terseLabel_en-US" xlink:label="lab_fr_ThreeFiveThreePerryStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">353 Perry Street [Member]</link:label>
    <link:label id="lab_fr_ThreeFiveThreePerryStreetMember_label_en-US" xlink:label="lab_fr_ThreeFiveThreePerryStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Five Three Perry Street [Member]</link:label>
    <link:label id="lab_fr_ThreeFiveThreePerryStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeFiveThreePerryStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Five Three Perry Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeFiveThreePerryStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeFiveThreePerryStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeFiveThreePerryStreetMember" xlink:to="lab_fr_ThreeFiveThreePerryStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyHeldForSale_12c39808-fd0d-4725-afff-df5cdd617d24_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyHeldForSale" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Proceeds from Sales of Investments in Real Estate</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyHeldForSale_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyHeldForSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale, Property, Held-for-Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyHeldForSale" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfPropertyHeldForSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfPropertyHeldForSale" xlink:to="lab_us-gaap_ProceedsFromSaleOfPropertyHeldForSale" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardTmgPredtrmndFlag_terseLabel_en-US" xlink:label="lab_ecd_AwardTmgPredtrmndFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Timing Predetermined</link:label>
    <link:label id="lab_ecd_AwardTmgPredtrmndFlag_label_en-US" xlink:label="lab_ecd_AwardTmgPredtrmndFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Timing Predetermined [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgPredtrmndFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardTmgPredtrmndFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardTmgPredtrmndFlag" xlink:to="lab_ecd_AwardTmgPredtrmndFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_095a25c2-8bb3-4eb0-843f-6b3a1539f994_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_13924c62-ed73-4968-b943-d5adafd3538b_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapitalMember" xlink:to="lab_us-gaap_AdditionalPaidInCapitalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TabularListTableTextBlock_terseLabel_en-US" xlink:label="lab_ecd_TabularListTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tabular List, Table</link:label>
    <link:label id="lab_ecd_TabularListTableTextBlock_label_en-US" xlink:label="lab_ecd_TabularListTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tabular List [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TabularListTableTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TabularListTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TabularListTableTextBlock" xlink:to="lab_ecd_TabularListTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member_bf939558-6114-41f7-bda9-63307a167ad6_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 II Swaps Due December 2025</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member_label_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II - December 2025) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member_documentation_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II - December 2025)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:href="fr-20251231.xsd#fr_InterestRateSwap2022SwapsIIDecember2025Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:to="lab_fr_InterestRateSwap2022SwapsIIDecember2025Member" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember_9eeea4c3-04a6-4f8c-84f0-68ca2b0a0145_terseLabel_en-US" xlink:label="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22300 E 26th Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember_label_en-US" xlink:label="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Three Zero Zero E Twentysixth Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Two Three Zero Zero E Twentysixth Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:to="lab_fr_TwoTwoThreeZeroZeroETwentysixthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineZeroTwoOneSReyesAvenueMember_6cc2b249-7c1e-4613-8309-abf501f6f38e_terseLabel_en-US" xlink:label="lab_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">19021 S. Reyes Ave [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroTwoOneSReyesAvenueMember_label_en-US" xlink:label="lab_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Zero Two One S Reyes Avenue [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroTwoOneSReyesAvenueMember_documentation_en-US" xlink:label="lab_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine zero two one S Reyes Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:href="fr-20251231.xsd#fr_OneNineZeroTwoOneSReyesAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:to="lab_fr_OneNineZeroTwoOneSReyesAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_50221d50-bbfe-4bb8-8df1-4c369589bb5a_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recent Accounting Pronouncements</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember_34d16c84-7dcf-4069-a79d-931cac3c088c_terseLabel_en-US" xlink:label="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3817 Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember_label_en-US" xlink:label="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight One Seven Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember_documentation_en-US" xlink:label="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight One Seven Ocean Ranch Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:href="fr-20251231.xsd#fr_ThreeEightOneSevenOceanRanchBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:to="lab_fr_ThreeEightOneSevenOceanRanchBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourHundredFortyFiveBryantStreetMember_38219ea0-ea1a-489a-a70a-e9b5826e6ba2_terseLabel_en-US" xlink:label="lab_fr_FourHundredFortyFiveBryantStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">445 Bryant Street [Member]</link:label>
    <link:label id="lab_fr_FourHundredFortyFiveBryantStreetMember_label_en-US" xlink:label="lab_fr_FourHundredFortyFiveBryantStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Hundred Forty Five Bryant Street [Member]</link:label>
    <link:label id="lab_fr_FourHundredFortyFiveBryantStreetMember_documentation_en-US" xlink:label="lab_fr_FourHundredFortyFiveBryantStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four hundred forty five Bryant Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourHundredFortyFiveBryantStreetMember" xlink:href="fr-20251231.xsd#fr_FourHundredFortyFiveBryantStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourHundredFortyFiveBryantStreetMember" xlink:to="lab_fr_FourHundredFortyFiveBryantStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded_fa9a39fe-2b0d-4d6e-810a-e54c74f3f821_terseLabel_en-US" xlink:label="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated total investment remaining to be funded</link:label>
    <link:label id="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded_label_en-US" xlink:label="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Estimated Total Investment Remaining To Be Funded</link:label>
    <link:label id="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded_documentation_en-US" xlink:label="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Estimated total investment remaining to be funded of industrial properties under construction.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:href="fr-20251231.xsd#fr_EstimatedTotalInvestmentRemainingToBeFunded"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:to="lab_fr_EstimatedTotalInvestmentRemainingToBeFunded" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember_b54f2a41-3b98-4e87-91de-32effb81b4a5_terseLabel_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2701 Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember_label_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Seven Hundred And One Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember_documentation_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand seven hundred and one commerce drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:href="fr-20251231.xsd#fr_TwoThousandSevenHundredAndOneCommerceDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:to="lab_fr_TwoThousandSevenHundredAndOneCommerceDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_UnrecapturedSectionGainPerShare_f44fdea6-4ddd-41d3-ae79-7d519a10db5b_terseLabel_en-US" xlink:label="lab_fr_UnrecapturedSectionGainPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecaptured Section&#160;1250 Capital Gain</link:label>
    <link:label id="lab_fr_UnrecapturedSectionGainPerShare_label_en-US" xlink:label="lab_fr_UnrecapturedSectionGainPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecaptured Section Gain Per Share</link:label>
    <link:label id="lab_fr_UnrecapturedSectionGainPerShare_documentation_en-US" xlink:label="lab_fr_UnrecapturedSectionGainPerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecaptured section gain per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_UnrecapturedSectionGainPerShare" xlink:href="fr-20251231.xsd#fr_UnrecapturedSectionGainPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_UnrecapturedSectionGainPerShare" xlink:to="lab_fr_UnrecapturedSectionGainPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_11639b82-8103-40aa-932e-596e080f1d67_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis" xlink:to="lab_us-gaap_FairValueByMeasurementBasisAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AdjToCompAxis_terseLabel_en-US" xlink:label="lab_ecd_AdjToCompAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment to Compensation:</link:label>
    <link:label id="lab_ecd_AdjToCompAxis_label_en-US" xlink:label="lab_ecd_AdjToCompAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustment to Compensation [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToCompAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AdjToCompAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AdjToCompAxis" xlink:to="lab_ecd_AdjToCompAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_31f78fc5-74fb-49f3-860b-89737ff4b6c9_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transactions</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transactions Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:to="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFourSevenThreeShaderRoadMember_445600f0-1e84-4be9-bcc6-42548ac5b2f0_terseLabel_en-US" xlink:label="lab_fr_FourFourSevenThreeShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4473 Shader Road [Member]</link:label>
    <link:label id="lab_fr_FourFourSevenThreeShaderRoadMember_label_en-US" xlink:label="lab_fr_FourFourSevenThreeShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Four Seven Three Shader Road [Member]</link:label>
    <link:label id="lab_fr_FourFourSevenThreeShaderRoadMember_documentation_en-US" xlink:label="lab_fr_FourFourSevenThreeShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Four Seven Three Shader Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFourSevenThreeShaderRoadMember" xlink:href="fr-20251231.xsd#fr_FourFourSevenThreeShaderRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFourSevenThreeShaderRoadMember" xlink:to="lab_fr_FourFourSevenThreeShaderRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NamedExecutiveOfficersFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_NamedExecutiveOfficersFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Named Executive Officers, Footnote</link:label>
    <link:label id="lab_ecd_NamedExecutiveOfficersFnTextBlock_label_en-US" xlink:label="lab_ecd_NamedExecutiveOfficersFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Named Executive Officers, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NamedExecutiveOfficersFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NamedExecutiveOfficersFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NamedExecutiveOfficersFnTextBlock" xlink:to="lab_ecd_NamedExecutiveOfficersFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandOneHundredRockCreekBlvdMember_84cf2e9c-c319-46ae-8446-2ce2c42093c0_terseLabel_en-US" xlink:label="lab_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4100 Rock Creek Blvd [Member]</link:label>
    <link:label id="lab_fr_FourThousandOneHundredRockCreekBlvdMember_label_en-US" xlink:label="lab_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand One Hundred Rock Creek Blvd [Member]</link:label>
    <link:label id="lab_fr_FourThousandOneHundredRockCreekBlvdMember_documentation_en-US" xlink:label="lab_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Thousand One Hundred Rock Creek Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:href="fr-20251231.xsd#fr_FourThousandOneHundredRockCreekBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:to="lab_fr_FourThousandOneHundredRockCreekBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeNineEvaStreetMember_c8244477-2382-4346-8c70-b3a49d686e19_terseLabel_en-US" xlink:label="lab_fr_OneThreeNineEvaStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">139 Eva Street [Member]</link:label>
    <link:label id="lab_fr_OneThreeNineEvaStreetMember_label_en-US" xlink:label="lab_fr_OneThreeNineEvaStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Nine Eva Street [Member]</link:label>
    <link:label id="lab_fr_OneThreeNineEvaStreetMember_documentation_en-US" xlink:label="lab_fr_OneThreeNineEvaStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One three nine Eva Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeNineEvaStreetMember" xlink:href="fr-20251231.xsd#fr_OneThreeNineEvaStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeNineEvaStreetMember" xlink:to="lab_fr_OneThreeNineEvaStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_CommonDistributionsPercentage_62f7fff8-f630-47eb-ab6d-39a45b5d3792_totalLabel_en-US" xlink:label="lab_fr_CommonDistributionsPercentage" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Common Distributions Percentage</link:label>
    <link:label id="lab_fr_CommonDistributionsPercentage_label_en-US" xlink:label="lab_fr_CommonDistributionsPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Distributions Percentage</link:label>
    <link:label id="lab_fr_CommonDistributionsPercentage_documentation_en-US" xlink:label="lab_fr_CommonDistributionsPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Common Distributions Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_CommonDistributionsPercentage" xlink:href="fr-20251231.xsd#fr_CommonDistributionsPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_CommonDistributionsPercentage" xlink:to="lab_fr_CommonDistributionsPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements_f474c17a-5895-4bad-aa3b-d741e59eb5be_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Buildings and Improvements</link:label>
    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements_label_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements" xlink:to="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TermLoanBorrowingCapacity_236b2824-c2cc-4282-a74a-a543bd8cd233_terseLabel_en-US" xlink:label="lab_fr_TermLoanBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan Borrowing Capacity</link:label>
    <link:label id="lab_fr_TermLoanBorrowingCapacity_label_en-US" xlink:label="lab_fr_TermLoanBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Borrowing Capacity</link:label>
    <link:label id="lab_fr_TermLoanBorrowingCapacity_documentation_en-US" xlink:label="lab_fr_TermLoanBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan Borrowing Capacity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TermLoanBorrowingCapacity" xlink:href="fr-20251231.xsd#fr_TermLoanBorrowingCapacity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TermLoanBorrowingCapacity" xlink:to="lab_fr_TermLoanBorrowingCapacity" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfStockByClassTable_41baf555-3a9a-4e5d-b9ac-9856df58d306_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfStockByClassTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock, Class of Stock [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfStockByClassTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfStockByClassTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock, Class of Stock [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable" xlink:to="lab_us-gaap_ScheduleOfStockByClassTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InPlaceLeasesandTenantRelationshipsMember_3e4f9d66-f075-454d-81c8-16a1c52886fe_terseLabel_en-US" xlink:label="lab_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">In-Place Leases and Tenant Relationships</link:label>
    <link:label id="lab_fr_InPlaceLeasesandTenantRelationshipsMember_label_en-US" xlink:label="lab_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">In-Place Leases and Tenant Relationships [Member]</link:label>
    <link:label id="lab_fr_InPlaceLeasesandTenantRelationshipsMember_documentation_en-US" xlink:label="lab_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">In-Place Lease and Tenant Relationships</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:href="fr-20251231.xsd#fr_InPlaceLeasesandTenantRelationshipsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:to="lab_fr_InPlaceLeasesandTenantRelationshipsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember_eeb263c2-dba2-4e41-93f1-02821a35f734_terseLabel_en-US" xlink:label="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6320 NW 12th Avenue</link:label>
    <link:label id="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember_label_en-US" xlink:label="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Three Two Zero NW Twelfth Avenue [Member]</link:label>
    <link:label id="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember_documentation_en-US" xlink:label="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Three Two Zero NW Twelfth Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:href="fr-20251231.xsd#fr_SixThreeTwoZeroNWTwelfthAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:to="lab_fr_SixThreeTwoZeroNWTwelfthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember_5a28b99c-214d-4165-a4ab-5239c7e04c9d_terseLabel_en-US" xlink:label="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2406-2416 Walnut Ridge [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember_label_en-US" xlink:label="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Zero Six To Two Four One Six Walnut Ridge [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember_documentation_en-US" xlink:label="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two four zero six to two four one six walnut ridge.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:href="fr-20251231.xsd#fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:to="lab_fr_TwoFourZeroSixToTwoFourOneSixWalnutRidgeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LesseeAccountingPolicyTextBlock_0cb9967e-5035-44cc-9ebf-dd8bb72f03d0_terseLabel_en-US" xlink:label="lab_fr_LesseeAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee Accounting</link:label>
    <link:label id="lab_fr_LesseeAccountingPolicyTextBlock_label_en-US" xlink:label="lab_fr_LesseeAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee Accounting [Policy Text Block]</link:label>
    <link:label id="lab_fr_LesseeAccountingPolicyTextBlock_documentation_en-US" xlink:label="lab_fr_LesseeAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee Accounting</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LesseeAccountingPolicyTextBlock" xlink:href="fr-20251231.xsd#fr_LesseeAccountingPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LesseeAccountingPolicyTextBlock" xlink:to="lab_fr_LesseeAccountingPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AreaOfRealEstateProperty_def52a77-3b2d-43f2-beb2-9bf50bcf5dff_terseLabel_en-US" xlink:label="lab_us-gaap_AreaOfRealEstateProperty" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross leasable area (GLA) of industrial properties owned</link:label>
    <link:label id="lab_us-gaap_AreaOfRealEstateProperty_bafab1dc-4a40-47dd-bc29-773bcbba146e_verboseLabel_en-US" xlink:label="lab_us-gaap_AreaOfRealEstateProperty" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gross leasable area (GLA) of industrial properties</link:label>
    <link:label id="lab_us-gaap_AreaOfRealEstateProperty_label_en-US" xlink:label="lab_us-gaap_AreaOfRealEstateProperty" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Area of Real Estate Property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AreaOfRealEstateProperty" xlink:to="lab_us-gaap_AreaOfRealEstateProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AdjToCompAmt_terseLabel_en-US" xlink:label="lab_ecd_AdjToCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment to Compensation, Amount</link:label>
    <link:label id="lab_ecd_AdjToCompAmt_label_en-US" xlink:label="lab_ecd_AdjToCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustment to Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AdjToCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AdjToCompAmt" xlink:to="lab_ecd_AdjToCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenEightFiveOneAirportHighwayMember_424c9e0a-ac3e-43b3-b56c-ee281f220867_terseLabel_en-US" xlink:label="lab_fr_SevenEightFiveOneAirportHighwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7851 Airport Highway [Member]</link:label>
    <link:label id="lab_fr_SevenEightFiveOneAirportHighwayMember_label_en-US" xlink:label="lab_fr_SevenEightFiveOneAirportHighwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Eight Five One Airport Highway [Member]</link:label>
    <link:label id="lab_fr_SevenEightFiveOneAirportHighwayMember_documentation_en-US" xlink:label="lab_fr_SevenEightFiveOneAirportHighwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven eight five one airport highway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenEightFiveOneAirportHighwayMember" xlink:href="fr-20251231.xsd#fr_SevenEightFiveOneAirportHighwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenEightFiveOneAirportHighwayMember" xlink:to="lab_fr_SevenEightFiveOneAirportHighwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2025UnsecuredTermLoanMember_019c44a7-5f0c-7bb7-8bb4-c7e57eb14369_terseLabel_en-US" xlink:label="lab_fr_A2025UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2025 Unsecured Term Loan</link:label>
    <link:label id="lab_fr_A2025UnsecuredTermLoanMember_label_en-US" xlink:label="lab_fr_A2025UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2025 Unsecured Term Loan [Member]</link:label>
    <link:label id="lab_fr_A2025UnsecuredTermLoanMember_documentation_en-US" xlink:label="lab_fr_A2025UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2025 Unsecured Term Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2025UnsecuredTermLoanMember" xlink:href="fr-20251231.xsd#fr_A2025UnsecuredTermLoanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2025UnsecuredTermLoanMember" xlink:to="lab_fr_A2025UnsecuredTermLoanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember_4842bc7e-fc21-4547-9023-f4467c2bafa4_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029 II Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Twenty Nine II [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Twenty Nine II</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Option</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Option [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOptionMember" xlink:to="lab_us-gaap_EmployeeStockOptionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_5dbc9ba0-9d85-4fa5-af26-3efeceb2dafe_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Property, Plant and Equipment [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember_306893ba-e239-4acb-b252-45d692ced3de_terseLabel_en-US" xlink:label="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8820 W. 116th Circle [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember_label_en-US" xlink:label="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Thousand Eight Hundred Twenty W One Hundred Sixteen Th Street [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember_documentation_en-US" xlink:label="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight thousand eight hundred twenty W one hundred sixteen th Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:href="fr-20251231.xsd#fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:to="lab_fr_EightThousandEightHundredTwentyWOneHundredSixteenThStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_74ca0dd1-a925-4be5-9d98-4da03b7ae05e_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:to="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixTwoZeroOneSNewcastleRoadMember_88886a4a-25c8-4e0b-a035-401753acabe1_terseLabel_en-US" xlink:label="lab_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6201 S. Newcastle Road</link:label>
    <link:label id="lab_fr_SixTwoZeroOneSNewcastleRoadMember_label_en-US" xlink:label="lab_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Two Zero One S Newcastle Road [Member]</link:label>
    <link:label id="lab_fr_SixTwoZeroOneSNewcastleRoadMember_documentation_en-US" xlink:label="lab_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Two Zero One S Newcastle Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:href="fr-20251231.xsd#fr_SixTwoZeroOneSNewcastleRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:to="lab_fr_SixTwoZeroOneSNewcastleRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ExtensionPeriod_7c77081a-50b4-4a27-9594-8a3e1854313d_terseLabel_en-US" xlink:label="lab_fr_ExtensionPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Extension Period</link:label>
    <link:label id="lab_fr_ExtensionPeriod_label_en-US" xlink:label="lab_fr_ExtensionPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Extension Period</link:label>
    <link:label id="lab_fr_ExtensionPeriod_documentation_en-US" xlink:label="lab_fr_ExtensionPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Extension Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ExtensionPeriod" xlink:href="fr-20251231.xsd#fr_ExtensionPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ExtensionPeriod" xlink:to="lab_fr_ExtensionPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DividendsCommonStockCash_4d319141-931d-433f-96ac-62301034df2f_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Common Stock Dividends and Unit Distributions</link:label>
    <link:label id="lab_us-gaap_DividendsCommonStockCash_f8977106-6212-41d4-8e06-8cd40653cdab_verboseLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total Common Stock Dividends / Unit Distributions</link:label>
    <link:label id="lab_us-gaap_DividendsCommonStockCash_label_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends, Common Stock, Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DividendsCommonStockCash" xlink:to="lab_us-gaap_DividendsCommonStockCash" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockholdersEquity_97da5347-7489-48fd-a29a-84edc509f12b_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total First Industrial Realty Trust, Inc.'s Equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity, Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquity" xlink:to="lab_us-gaap_StockholdersEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_de109abc-d78f-4da1-a36d-9a4e8c949d6e_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_802a872e-c2af-42f4-a1c3-d851f36d9a54_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax [Abstract]</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_InsiderTradingPoliciesProcLineItems_label_en-US" xlink:label="lab_ecd_InsiderTradingPoliciesProcLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insider Trading Policies and Procedures [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTradingPoliciesProcLineItems" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTradingPoliciesProcLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_InsiderTradingPoliciesProcLineItems" xlink:to="lab_ecd_InsiderTradingPoliciesProcLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember_081830b4-9b3e-44a6-9b7d-47362988892c_terseLabel_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4436 Mulhauser Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember_label_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand Four Hundred Thirty Six Mulhauser Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember_documentation_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four thousand four hundred thirty six Mulhauser Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:href="fr-20251231.xsd#fr_FourThousandFourHundredThirtySixMulhauserRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:to="lab_fr_FourThousandFourHundredThirtySixMulhauserRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_6da5fefa-b52b-4e81-959e-359e9f25839c_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock, shares authorized</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares Authorized</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized" xlink:to="lab_us-gaap_CommonStockSharesAuthorized" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember_f0e2e9b1-44ef-485b-a1d4-e655f0259b8b_terseLabel_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4438 Mulhauser Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember_label_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand Four Hundred Thirty Eight Mulhauser Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember_documentation_en-US" xlink:label="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four thousand four hundred thirty eight Mulhauser Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:href="fr-20251231.xsd#fr_FourThousandFourHundredThirtyEightMulhauserRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:to="lab_fr_FourThousandFourHundredThirtyEightMulhauserRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourZeroZeroMaddoxRoadMember_6db4c8ae-2019-442f-8746-3910db0e9416_terseLabel_en-US" xlink:label="lab_fr_FourZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">400 Maddox Road</link:label>
    <link:label id="lab_fr_FourZeroZeroMaddoxRoadMember_label_en-US" xlink:label="lab_fr_FourZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Zero Zero Maddox Road [Member]</link:label>
    <link:label id="lab_fr_FourZeroZeroMaddoxRoadMember_documentation_en-US" xlink:label="lab_fr_FourZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Zero Zero Maddox Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourZeroZeroMaddoxRoadMember" xlink:href="fr-20251231.xsd#fr_FourZeroZeroMaddoxRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourZeroZeroMaddoxRoadMember" xlink:to="lab_fr_FourZeroZeroMaddoxRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember_c6260146-d1a2-4ad5-952c-03bbfff74208_terseLabel_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9500 West 49th Street - B [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember_label_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street B [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember_documentation_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street B Member.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:href="fr-20251231.xsd#fr_NineFiveZeroZeroWestFourNinthStreetBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:to="lab_fr_NineFiveZeroZeroWestFourNinthStreetBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroZeroZeroWestCommerceMember_fe72a0d7-7ff4-4354-b67f-9bfb2d52a0c5_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3000 West Commerce [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroZeroZeroWestCommerceMember_label_en-US" xlink:label="lab_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Zero Zero West Commerce [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroZeroZeroWestCommerceMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three zero zero zero west commerce.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroZeroZeroWestCommerceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:to="lab_fr_ThreeZeroZeroZeroWestCommerceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourOneFourFivePhiladelphiaPikeMember_aa2e3531-e636-4d5c-878d-0126f594019a_terseLabel_en-US" xlink:label="lab_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4145 Philadelphia Pike</link:label>
    <link:label id="lab_fr_FourOneFourFivePhiladelphiaPikeMember_label_en-US" xlink:label="lab_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four One Four Five Philadelphia Pike [Member]</link:label>
    <link:label id="lab_fr_FourOneFourFivePhiladelphiaPikeMember_documentation_en-US" xlink:label="lab_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four One Four Five Philadelphia Pike</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:href="fr-20251231.xsd#fr_FourOneFourFivePhiladelphiaPikeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:to="lab_fr_FourOneFourFivePhiladelphiaPikeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_609fc1c6-1e3a-4751-aa2f-fae2394a4a1d_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of Common Stock/Contribution of General Partner Units</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_b89c52a7-5086-405c-8df7-7dd33b769d44_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Recurring</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsRecurringMember" xlink:to="lab_us-gaap_FairValueMeasurementsRecurringMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2b419667-3d0d-4367-b17a-26d9cfe3de46_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND EQUITY/PARTNERS' CAPITAL</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a6f45c0a-4c34-4e8d-92db-a468244afc2d_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND PARTNERS' CAPITAL</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue_b5313979-5d16-4f77-9e33-f82c47c84ff3_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Hedging Instrument, Asset, Fair Value</link:label>
    <link:label id="lab_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue_label_en-US" xlink:label="lab_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow Hedge Derivative Instrument Assets at Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue" xlink:to="lab_us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InvestmentinRealEstateActivityDomain_f5910524-68fe-44c5-bde1-f2421d69bf5e_terseLabel_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Real Estate Activity [Domain]</link:label>
    <link:label id="lab_fr_InvestmentinRealEstateActivityDomain_label_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment in Real Estate Activity [Domain]</link:label>
    <link:label id="lab_fr_InvestmentinRealEstateActivityDomain_documentation_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Investment in Real Estate Activity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InvestmentinRealEstateActivityDomain" xlink:href="fr-20251231.xsd#fr_InvestmentinRealEstateActivityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InvestmentinRealEstateActivityDomain" xlink:to="lab_fr_InvestmentinRealEstateActivityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_810b2168-b306-442f-b231-554b924d68ba_terseLabel_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_0efa2b6e-4b8a-48ce-8829-ea6849bda735_terseLabel_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value</link:label>
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_label_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Portion at Fair Value Measurement [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:to="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MaximumMember_52cfe0bd-ee98-42dc-9c93-1263a7f945b6_terseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_srt_MaximumMember_label_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember" xlink:to="lab_srt_MaximumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_8406044d-216a-4faa-a81a-87d818233f70_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Real Estate:</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Net [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNetAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateInvestmentPropertyNetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateInvestmentPropertyNetAbstract" xlink:to="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixFiveOneFourWarrenDriveMember_7ed7b850-4dbb-447f-8c80-eb3778515959_terseLabel_en-US" xlink:label="lab_fr_SixFiveOneFourWarrenDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6514 Warren Drive [Member]</link:label>
    <link:label id="lab_fr_SixFiveOneFourWarrenDriveMember_label_en-US" xlink:label="lab_fr_SixFiveOneFourWarrenDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Five One Four Warren Drive [Member]</link:label>
    <link:label id="lab_fr_SixFiveOneFourWarrenDriveMember_documentation_en-US" xlink:label="lab_fr_SixFiveOneFourWarrenDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six five one four warren drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixFiveOneFourWarrenDriveMember" xlink:href="fr-20251231.xsd#fr_SixFiveOneFourWarrenDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixFiveOneFourWarrenDriveMember" xlink:to="lab_fr_SixFiveOneFourWarrenDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7898791f-2426-4f20-85d0-6e3a670c2788_negatedLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Net Income Attributable to the Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:to="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtAbstract_65229102-6201-4f93-a288-9bae16d8e7ba_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Indebtedness:</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAbstract_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Unclassified [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAbstract" xlink:to="lab_us-gaap_LongTermDebtAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_stpr_PA_019c49bb-2360-7a1f-8a87-2b9e18ff08dc_terseLabel_en-US" xlink:label="lab_stpr_PA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PENNSYLVANIA</link:label>
    <link:label id="lab_stpr_PA_label_en-US" xlink:label="lab_stpr_PA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PENNSYLVANIA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_PA" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_PA"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_stpr_PA" xlink:to="lab_stpr_PA" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_a6b27298-69c9-4810-b542-ae240ff6b371_verboseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total deferred leasing intangibles, net, included in total assets</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsNet" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LeasesDisclosureTextBlock_32a6ef64-a2de-4f9e-934c-7e730e55f3fe_terseLabel_en-US" xlink:label="lab_fr_LeasesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_fr_LeasesDisclosureTextBlock_label_en-US" xlink:label="lab_fr_LeasesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases Disclosure [Text Block]</link:label>
    <link:label id="lab_fr_LeasesDisclosureTextBlock_documentation_en-US" xlink:label="lab_fr_LeasesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee and Lessor Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LeasesDisclosureTextBlock" xlink:href="fr-20251231.xsd#fr_LeasesDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LeasesDisclosureTextBlock" xlink:to="lab_fr_LeasesDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentCollateralAmount_ce450281-b2b6-4632-bb8d-50e89c303d33_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCollateralAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net carrying value of industrial properties collateralized by mortgage loans</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCollateralAmount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCollateralAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Collateral Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateralAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCollateralAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCollateralAmount" xlink:to="lab_us-gaap_DebtInstrumentCollateralAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember_9e4e7d7f-1c46-450b-b00f-492b5a6e17e5_terseLabel_en-US" xlink:label="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">801-831 S Great Southwest Pkwy [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember_label_en-US" xlink:label="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero One Eight Three One S Great Southwest G [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember_documentation_en-US" xlink:label="lab_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Zero One Eight Three One S Great Southwest G.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroOneEightThreeOneSGreatSouthwestGMember" xlink:href="fr-20251231.xsd#fr_EightZeroOneEightThreeOneSGreatSouthwestGMember"/>
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    <link:label id="lab_us-gaap_RestrictedStockMember_cb8c9b22-566e-44ee-aab7-59bb534c3714_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service Awards/Service Units</link:label>
    <link:label id="lab_us-gaap_RestrictedStockMember_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockMember" xlink:to="lab_us-gaap_RestrictedStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonPeoNeoAvgTotalCompAmt_terseLabel_en-US" xlink:label="lab_ecd_NonPeoNeoAvgTotalCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-PEO NEO Average Total Compensation Amount</link:label>
    <link:label id="lab_ecd_NonPeoNeoAvgTotalCompAmt_label_en-US" xlink:label="lab_ecd_NonPeoNeoAvgTotalCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-PEO NEO Average Total Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoAvgTotalCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonPeoNeoAvgTotalCompAmt"/>
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    <link:label id="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember_35c47c73-e2be-45fb-9d4c-62ae8cb55a25_terseLabel_en-US" xlink:label="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1171 North Cockrell Hill Road [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember_label_en-US" xlink:label="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Seven One North Cockrell Hill Road [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember_documentation_en-US" xlink:label="lab_fr_OneOneSevenOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Seven One North Cockrell Hill Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneSevenOneNorthCockrellHillRoadMember" xlink:href="fr-20251231.xsd#fr_OneOneSevenOneNorthCockrellHillRoadMember"/>
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    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_7b35a635-96b2-4d07-ab23-12c4862c3ae2_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationByPropertyTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate and Accumulated Depreciation, by Property [Table]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationByPropertyTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_3d1bb368-55fc-455a-b4e4-87eb86b704e9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems" xlink:to="lab_us-gaap_DebtInstrumentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_832c2487-f49d-406d-9130-1a3fd6ca678b_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_f8bf7cdf-3bb0-424b-8932-ee130a498438_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Service Award Transactions</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightFourZeroFourNWNinetiethStreetMember_65220926-180f-4fd7-b00b-48b13042e968_terseLabel_en-US" xlink:label="lab_fr_EightFourZeroFourNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8404 NW 90th Street</link:label>
    <link:label id="lab_fr_EightFourZeroFourNWNinetiethStreetMember_label_en-US" xlink:label="lab_fr_EightFourZeroFourNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Four Zero Four NW Ninetieth Street [Member]</link:label>
    <link:label id="lab_fr_EightFourZeroFourNWNinetiethStreetMember_documentation_en-US" xlink:label="lab_fr_EightFourZeroFourNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Four Zero Four NW Ninetieth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightFourZeroFourNWNinetiethStreetMember" xlink:href="fr-20251231.xsd#fr_EightFourZeroFourNWNinetiethStreetMember"/>
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    <link:label id="lab_ecd_AdjToNonPeoNeoCompFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment to Non-PEO NEO Compensation Footnote</link:label>
    <link:label id="lab_ecd_AdjToNonPeoNeoCompFnTextBlock_label_en-US" xlink:label="lab_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustment to Non-PEO NEO Compensation Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AdjToNonPeoNeoCompFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:to="lab_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt_terseLabel_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Disqualification of Tax Benefits, Amount</link:label>
    <link:label id="lab_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt_label_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Disqualification of Tax Benefits, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:to="lab_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroFiveEightSixTamarindAvenueMember_eba4bc86-821a-4eba-9b72-4d993ee6a68b_terseLabel_en-US" xlink:label="lab_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10586 Tamarind Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroFiveEightSixTamarindAvenueMember_label_en-US" xlink:label="lab_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Five Eight Six Tamarind Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroFiveEightSixTamarindAvenueMember_documentation_en-US" xlink:label="lab_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero Five Eight Six Tamarind Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:href="fr-20251231.xsd#fr_OneZeroFiveEightSixTamarindAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:to="lab_fr_OneZeroFiveEightSixTamarindAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneHundredAndFiveSteamboatBlvdMember_9daaf230-c4f4-45fc-9cc5-c256813d7e05_terseLabel_en-US" xlink:label="lab_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">105 Steamboat Blvd [Member]</link:label>
    <link:label id="lab_fr_OneHundredAndFiveSteamboatBlvdMember_label_en-US" xlink:label="lab_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Hundred And Five Steamboat Blvd [Member]</link:label>
    <link:label id="lab_fr_OneHundredAndFiveSteamboatBlvdMember_documentation_en-US" xlink:label="lab_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Hundred And Five Steamboat Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:href="fr-20251231.xsd#fr_OneHundredAndFiveSteamboatBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:to="lab_fr_OneHundredAndFiveSteamboatBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonRule10b51ArrTrmntdFlag_terseLabel_en-US" xlink:label="lab_ecd_NonRule10b51ArrTrmntdFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Terminated</link:label>
    <link:label id="lab_ecd_NonRule10b51ArrTrmntdFlag_label_en-US" xlink:label="lab_ecd_NonRule10b51ArrTrmntdFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Terminated [Flag]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NonRule10b51ArrTrmntdFlag" xlink:to="lab_ecd_NonRule10b51ArrTrmntdFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityShellCompany_98b5f596-7441-45b0-8a7f-735ebaa0be52_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Shell Company</link:label>
    <link:label id="lab_dei_EntityShellCompany_label_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Shell Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
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    <link:label id="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember_82fbd6ae-39b9-4a3b-82d5-0e11522b4873_terseLabel_en-US" xlink:label="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1251 North Cockrell Hill Road [Member]</link:label>
    <link:label id="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember_label_en-US" xlink:label="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Five One North Cockrell Hill Road [Member]</link:label>
    <link:label id="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember_documentation_en-US" xlink:label="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Five One North Cockrell Hill Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:href="fr-20251231.xsd#fr_OneTwoFiveOneNorthCockrellHillRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:to="lab_fr_OneTwoFiveOneNorthCockrellHillRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OrganizationAndFormationOfCompanyLineItems_131545e1-a0bb-4f72-bd2d-6eebde129b40_terseLabel_en-US" xlink:label="lab_fr_OrganizationAndFormationOfCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Organization [Line Items]</link:label>
    <link:label id="lab_fr_OrganizationAndFormationOfCompanyLineItems_label_en-US" xlink:label="lab_fr_OrganizationAndFormationOfCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization And Formation Of Company [Line Items]</link:label>
    <link:label id="lab_fr_OrganizationAndFormationOfCompanyLineItems_documentation_en-US" xlink:label="lab_fr_OrganizationAndFormationOfCompanyLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Organization And Formation Of Company [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OrganizationAndFormationOfCompanyLineItems" xlink:href="fr-20251231.xsd#fr_OrganizationAndFormationOfCompanyLineItems"/>
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    <link:label id="lab_us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock_98bd910e-15f9-41c0-964d-b1f270ffc6d1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Indebtedness at Estimated Fair Value</link:label>
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    <link:label id="lab_us-gaap_AwardTypeAxis_350f1b7a-90c8-4ff6-9a7d-178ac81966d4_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:label id="lab_us-gaap_AwardTypeAxis_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AwardTypeAxis" xlink:to="lab_us-gaap_AwardTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred_fb4f4643-9c33-48f8-aa46-94b1ee4271fa_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization to be reclassified from OCI into income</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:to="lab_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwap2021SwapsMember_41d41fcb-f73c-4cd1-991c-c2a10e6b5eb1_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwap2021SwapsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 Swaps</link:label>
    <link:label id="lab_fr_InterestRateSwap2021SwapsMember_label_en-US" xlink:label="lab_fr_InterestRateSwap2021SwapsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2021 Swaps) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwap2021SwapsMember_documentation_en-US" xlink:label="lab_fr_InterestRateSwap2021SwapsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2021 Swaps)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwap2021SwapsMember" xlink:href="fr-20251231.xsd#fr_InterestRateSwap2021SwapsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwap2021SwapsMember" xlink:to="lab_fr_InterestRateSwap2021SwapsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfDividendsPayableTextBlock_ea0d645b-e364-48fe-aabd-1044e068cb07_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDividendsPayableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Dividends/Distributions</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDividendsPayableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDividendsPayableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Dividends Payable [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDividendsPayableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDividendsPayableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDividendsPayableTextBlock" xlink:to="lab_us-gaap_ScheduleOfDividendsPayableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock_7c056203-5b9f-40d8-b099-ed89e2af6373_terseLabel_en-US" xlink:label="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Useful Lives of Depreciable Assets</link:label>
    <link:label id="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock_label_en-US" xlink:label="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Plant And Equipment Useful Lives Table [Table Text Block]</link:label>
    <link:label id="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock_documentation_en-US" xlink:label="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure which describes the periods of time which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:href="fr-20251231.xsd#fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:to="lab_fr_PropertyPlantAndEquipmentUsefulLivesTableTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions_8439d470-c4e4-43d5-868e-f3d66205d179_terseLabel_en-US" xlink:label="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecaptured Section 1250 Gain as a Percentage of Distributions</link:label>
    <link:label id="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions_label_en-US" xlink:label="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecaptured Section Gain As Percentage Of Distributions</link:label>
    <link:label id="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions_documentation_en-US" xlink:label="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecaptured section gain as percentage of distributions.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:href="fr-20251231.xsd#fr_UnrecapturedSectionGainAsPercentageOfDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:to="lab_fr_UnrecapturedSectionGainAsPercentageOfDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_EquityMethodInvesteeNameDomain_5ef56dd0-bdcd-45af-9999-beb8c96cdeb3_terseLabel_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Method Investee, Name [Domain]</link:label>
    <link:label id="lab_srt_EquityMethodInvesteeNameDomain_label_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_EquityMethodInvesteeNameDomain" xlink:to="lab_srt_EquityMethodInvesteeNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_8a07b013-d308-4d75-b6cc-03337b1a1f88_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Based Compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:to="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_0ee71cde-da6e-4b8b-8847-c6c90ec78d5e_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained Earnings</link:label>
    <link:label id="lab_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_label_en-US" xlink:label="lab_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Distributions in Excess of Net Income [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:to="lab_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeMaturityDates_019c44e4-1d84-7ceb-a52b-357741d60ac2_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeMaturityDates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative, Contract End Date</link:label>
    <link:label id="lab_us-gaap_DerivativeMaturityDates_label_en-US" xlink:label="lab_us-gaap_DerivativeMaturityDates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Contract End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMaturityDates" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeMaturityDates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeMaturityDates" xlink:to="lab_us-gaap_DerivativeMaturityDates" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_TradingSymbol_b3964537-bbe4-45ca-bf54-7ba94461beab_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_label_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol" xlink:to="lab_dei_TradingSymbol" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_0384fb34-2859-4a22-aabf-c783812ad5ca_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember_6bb5c924-e3b4-4cea-bb5b-8bd9aab26eec_terseLabel_en-US" xlink:label="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6150 Sycamore Canyon Blvd [Member]</link:label>
    <link:label id="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember_label_en-US" xlink:label="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six One Five Zero Sycamore Canyon Blvd [Member]</link:label>
    <link:label id="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember_documentation_en-US" xlink:label="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six One Five Zero Sycamore Canyon Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:href="fr-20251231.xsd#fr_SixOneFiveZeroSycamoreCanyonBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:to="lab_fr_SixOneFiveZeroSycamoreCanyonBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_97adfe36-7a8f-4cd4-b355-9e86191c9ce9_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember_4a910a6c-78ae-4c32-811f-f95edf15c25a_terseLabel_en-US" xlink:label="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2500-2530 Fairway Park Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember_label_en-US" xlink:label="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Five Zero Zero to Two Five Three Zero Fairway Park Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember_documentation_en-US" xlink:label="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two five zero zero to two five three zero Fairway Park Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:href="fr-20251231.xsd#fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:to="lab_fr_TwoFiveZeroZerotoTwoFiveThreeZeroFairwayParkDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember_39c1e58f-41d1-4684-8dd5-9c208cff0008_terseLabel_en-US" xlink:label="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2401-2407 Centennial Dr [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember_label_en-US" xlink:label="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Zero One Two Four Zero Seven Centennial [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember_documentation_en-US" xlink:label="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Zero One Two Four Zero Seven Centennial.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:href="fr-20251231.xsd#fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:to="lab_fr_TwoFourZeroOneTwoFourZeroSevenCentennialMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxAssetsNet_019c45ca-fb77-7c64-8629-61d1787b3b84_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Deferred Income Tax Assets</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsNet_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Net of Valuation Allowance</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsNet" xlink:to="lab_us-gaap_DeferredTaxAssetsNet" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonPeoNeoAvgCompActuallyPaidAmt_terseLabel_en-US" xlink:label="lab_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-PEO NEO Average Compensation Actually Paid Amount</link:label>
    <link:label id="lab_ecd_NonPeoNeoAvgCompActuallyPaidAmt_label_en-US" xlink:label="lab_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-PEO NEO Average Compensation Actually Paid Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonPeoNeoAvgCompActuallyPaidAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:to="lab_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_095d71e8-9404-45dd-9df1-8265579104ef_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance RLP Units</link:label>
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock Units (RSUs) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:to="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold_348ba02a-2637-445d-bbd6-a43abaa1303b_negatedLabel_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Disposition of Assets</link:label>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold_label_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAccumulatedDepreciationRealEstateSold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold" xlink:to="lab_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember_cdca38b7-1ad7-4cce-ba99-38e12c9cf61c_terseLabel_en-US" xlink:label="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22718 58th Place [Member]</link:label>
    <link:label id="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember_label_en-US" xlink:label="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Seven One Eight Fifty Eighth Place [Member]</link:label>
    <link:label id="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember_documentation_en-US" xlink:label="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Two Seven One Eight Fifty Eighth Place [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:href="fr-20251231.xsd#fr_TwoTwoSevenOneEightFiftyEighthPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:to="lab_fr_TwoTwoSevenOneEightFiftyEighthPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_CompActuallyPaidVsOtherMeasureTextBlock_terseLabel_en-US" xlink:label="lab_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Other Measure</link:label>
    <link:label id="lab_ecd_CompActuallyPaidVsOtherMeasureTextBlock_label_en-US" xlink:label="lab_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Other Measure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CompActuallyPaidVsOtherMeasureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:to="lab_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_e0a5d41d-6e1b-4a80-9257-1ec814cc6ad3_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany" xlink:to="lab_dei_EntityEmergingGrowthCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember_44071982-f11e-4602-ac7f-ffbaa74c1201_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3060 South Park Blvd [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember_label_en-US" xlink:label="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Six Zero South Park Blvd [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three zero six zero south park blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroSixZeroSouthParkBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:to="lab_fr_ThreeZeroSixZeroSouthParkBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_cb7f75d8-06f4-46d6-ba89-e37e7418b2c8_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineOneEightZeroWBuckeyeRoadMember_860b605e-1584-4cf0-879e-32fabaad4d71_terseLabel_en-US" xlink:label="lab_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9180 W. Buckeye Road [Member]</link:label>
    <link:label id="lab_fr_NineOneEightZeroWBuckeyeRoadMember_label_en-US" xlink:label="lab_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine One Eight Zero W Buckeye Road [Member]</link:label>
    <link:label id="lab_fr_NineOneEightZeroWBuckeyeRoadMember_documentation_en-US" xlink:label="lab_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine One Eight Zero W Buckeye Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:href="fr-20251231.xsd#fr_NineOneEightZeroWBuckeyeRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:to="lab_fr_NineOneEightZeroWBuckeyeRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember_11a5b8a0-2586-49ee-99d3-63f581e4f428_terseLabel_en-US" xlink:label="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">27403 Industrial Boulevard [Member]</link:label>
    <link:label id="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember_label_en-US" xlink:label="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Four Zero Three Industrial Boulevard [Member]</link:label>
    <link:label id="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember_documentation_en-US" xlink:label="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Four Zero Three Industrial Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:href="fr-20251231.xsd#fr_TwoSevenFourZeroThreeIndustrialBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:to="lab_fr_TwoSevenFourZeroThreeIndustrialBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember_terseLabel_en-US" xlink:label="lab_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year</link:label>
    <link:label id="lab_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember_label_en-US" xlink:label="lab_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:to="lab_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_AccumulatedOtherComprehensiveLossAbstract_c8facb12-cbf3-4c9e-b84e-7b73377f3bea_terseLabel_en-US" xlink:label="lab_fr_AccumulatedOtherComprehensiveLossAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Loss [Abstract]</link:label>
    <link:label id="lab_fr_AccumulatedOtherComprehensiveLossAbstract_label_en-US" xlink:label="lab_fr_AccumulatedOtherComprehensiveLossAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Loss [Abstract]</link:label>
    <link:label id="lab_fr_AccumulatedOtherComprehensiveLossAbstract_documentation_en-US" xlink:label="lab_fr_AccumulatedOtherComprehensiveLossAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Loss [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_AccumulatedOtherComprehensiveLossAbstract" xlink:href="fr-20251231.xsd#fr_AccumulatedOtherComprehensiveLossAbstract"/>
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    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_6a3a731e-2349-4db2-8dbe-690c6e8699d0_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash</link:label>
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalents" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_019c49b4-9552-72e9-963a-ba57517790eb_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deferred Income - Investment in Joint Venture</link:label>
    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Tax Deferred Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:to="lab_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LeasesAcquiredInPlaceMember_dc43e37e-f3d8-4452-b259-960c013f65d5_terseLabel_en-US" xlink:label="lab_us-gaap_LeasesAcquiredInPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">In-Place Leases</link:label>
    <link:label id="lab_us-gaap_LeasesAcquiredInPlaceMember_label_en-US" xlink:label="lab_us-gaap_LeasesAcquiredInPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases, Acquired-in-Place [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAcquiredInPlaceMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAcquiredInPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAcquiredInPlaceMember" xlink:to="lab_us-gaap_LeasesAcquiredInPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_79348498-7060-4a54-8b2f-d45dccd954a9_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock, shares outstanding</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_c260f8a2-900f-4aca-81e7-d736a47da298_periodStartLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Common Stock/Units, Outstanding, Beginning Balance</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_02e07f94-f189-482f-b165-5121b7c1f2ad_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Common Stock/Units, Outstanding, Ending Balance</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding" xlink:to="lab_us-gaap_CommonStockSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightFourOneZeroArjonsDriveMember_849fe2f9-84d7-4b89-88bf-7e524acd5943_terseLabel_en-US" xlink:label="lab_fr_EightFourOneZeroArjonsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8410 Arjons Drive</link:label>
    <link:label id="lab_fr_EightFourOneZeroArjonsDriveMember_label_en-US" xlink:label="lab_fr_EightFourOneZeroArjonsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Four One Zero Arjons Drive [Member]</link:label>
    <link:label id="lab_fr_EightFourOneZeroArjonsDriveMember_documentation_en-US" xlink:label="lab_fr_EightFourOneZeroArjonsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Four One Zero Arjons Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightFourOneZeroArjonsDriveMember" xlink:href="fr-20251231.xsd#fr_EightFourOneZeroArjonsDriveMember"/>
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    <link:label id="lab_fr_FourSixFourZeroCummingsParkMember_f3aa2643-c7b9-4973-a285-b8a58b9f9c78_terseLabel_en-US" xlink:label="lab_fr_FourSixFourZeroCummingsParkMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4640 Cummings Park [Member]</link:label>
    <link:label id="lab_fr_FourSixFourZeroCummingsParkMember_label_en-US" xlink:label="lab_fr_FourSixFourZeroCummingsParkMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Six Four Zero Cummings Park [Member]</link:label>
    <link:label id="lab_fr_FourSixFourZeroCummingsParkMember_documentation_en-US" xlink:label="lab_fr_FourSixFourZeroCummingsParkMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four six four zero Cummings Park.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSixFourZeroCummingsParkMember" xlink:href="fr-20251231.xsd#fr_FourSixFourZeroCummingsParkMember"/>
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    <link:label id="lab_us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock_ee3203ee-aa00-4463-bfb6-c39d4eba0686_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock and Units Roll-Forward</link:label>
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    <link:label id="lab_ecd_DvddsOrOthrErngsPdOnEqtyAwrdsNtOthrwsRflctdInTtlCompForCvrdYrMember_terseLabel_en-US" xlink:label="lab_ecd_DvddsOrOthrErngsPdOnEqtyAwrdsNtOthrwsRflctdInTtlCompForCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year</link:label>
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    <link:label id="lab_fr_FiveThreeNineZeroEPonceDeLeonMember_54283a36-7217-49b7-a223-7c58e99f97a6_terseLabel_en-US" xlink:label="lab_fr_FiveThreeNineZeroEPonceDeLeonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5390 E. Ponce De Leon [Member]</link:label>
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    <link:label id="lab_fr_TwoZeroZeroZeroVistaBellaWayMember_3cb01cbb-4c75-4fec-b955-fa1edef371ee_terseLabel_en-US" xlink:label="lab_fr_TwoZeroZeroZeroVistaBellaWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2000 Vista Bella Way [Member]</link:label>
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    <link:label id="lab_fr_ThreeEightNineFiveEastgateBlvdBldgBMember_30fd69dc-69a2-459e-bdb9-eda7e702bf02_terseLabel_en-US" xlink:label="lab_fr_ThreeEightNineFiveEastgateBlvdBldgBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3895 Eastgate Blvd Bldg B [Member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightNineFiveEastgateBlvdBldgBMember" xlink:href="fr-20251231.xsd#fr_ThreeEightNineFiveEastgateBlvdBldgBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightNineFiveEastgateBlvdBldgBMember" xlink:to="lab_fr_ThreeEightNineFiveEastgateBlvdBldgBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_ab4cb61e-a8c9-49a3-91ca-c3472fd6d740_negatedLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Income Tax Provision</link:label>
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_a9552d64-bb72-4328-bf2a-b9641a585e34_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Income Tax (Provision) Benefit</link:label>
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember_ccfafd0e-1b13-468d-abda-8db5032ad4db_terseLabel_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027 Notes</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember_label_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due Two Thousand Twenty Seven Notes [Member]</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember_documentation_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior notes due two thousand twenty seven notes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:href="fr-20251231.xsd#fr_SeniorNotesDueTwoThousandTwentySevenNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:to="lab_fr_SeniorNotesDueTwoThousandTwentySevenNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_49244b96-f9a5-482a-9d6b-2e8d7a217821_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherAssets_79a4ad08-22be-4a98-9ac7-fd6cd142b604_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets</link:label>
    <link:label id="lab_us-gaap_OtherAssets_label_en-US" xlink:label="lab_us-gaap_OtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssets" xlink:to="lab_us-gaap_OtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ReceivableDueFromTheJointVenture_5be37ac0-65c5-4c5b-abb1-912587b1991a_terseLabel_en-US" xlink:label="lab_fr_ReceivableDueFromTheJointVenture" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivable Due From The Joint Venture</link:label>
    <link:label id="lab_fr_ReceivableDueFromTheJointVenture_label_en-US" xlink:label="lab_fr_ReceivableDueFromTheJointVenture" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable Due From The Joint Venture</link:label>
    <link:label id="lab_fr_ReceivableDueFromTheJointVenture_documentation_en-US" xlink:label="lab_fr_ReceivableDueFromTheJointVenture" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Receivable Due From The Joint Venture</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ReceivableDueFromTheJointVenture" xlink:href="fr-20251231.xsd#fr_ReceivableDueFromTheJointVenture"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ReceivableDueFromTheJointVenture" xlink:to="lab_fr_ReceivableDueFromTheJointVenture" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UnsecuredDebt_12bf863f-7958-42a0-856a-7923d0e2aaf3_verboseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebt" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes, Net</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebt_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebt" xlink:to="lab_us-gaap_UnsecuredDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PnsnAdjsSvcCstMember_terseLabel_en-US" xlink:label="lab_ecd_PnsnAdjsSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension Adjustments Service Cost</link:label>
    <link:label id="lab_ecd_PnsnAdjsSvcCstMember_label_en-US" xlink:label="lab_ecd_PnsnAdjsSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension Adjustments Service Cost [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnAdjsSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PnsnAdjsSvcCstMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PnsnAdjsSvcCstMember" xlink:to="lab_ecd_PnsnAdjsSvcCstMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NoncashOperatingActivitiesAbstract_8e09b02e-adf6-41ad-b16c-59848687bbba_terseLabel_en-US" xlink:label="lab_fr_NoncashOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental Schedule of Non-Cash Operating Activities:</link:label>
    <link:label id="lab_fr_NoncashOperatingActivitiesAbstract_label_en-US" xlink:label="lab_fr_NoncashOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncash Operating Activities [Abstract]</link:label>
    <link:label id="lab_fr_NoncashOperatingActivitiesAbstract_documentation_en-US" xlink:label="lab_fr_NoncashOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NoncashOperatingActivities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NoncashOperatingActivitiesAbstract" xlink:href="fr-20251231.xsd#fr_NoncashOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NoncashOperatingActivitiesAbstract" xlink:to="lab_fr_NoncashOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_327a537e-fda4-4bdb-87fb-d0d62163b3ef_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NumberofAcres_3c41afd4-f194-416e-a60c-141b0acbea95_terseLabel_en-US" xlink:label="lab_fr_NumberofAcres" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Acres</link:label>
    <link:label id="lab_fr_NumberofAcres_label_en-US" xlink:label="lab_fr_NumberofAcres" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Acres</link:label>
    <link:label id="lab_fr_NumberofAcres_documentation_en-US" xlink:label="lab_fr_NumberofAcres" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of Acres</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NumberofAcres" xlink:href="fr-20251231.xsd#fr_NumberofAcres"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NumberofAcres" xlink:to="lab_fr_NumberofAcres" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember_9f0154d2-1773-4902-8706-78442fabf526_terseLabel_en-US" xlink:label="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">175 Greenwood Industrial Parkway [Member]</link:label>
    <link:label id="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember_label_en-US" xlink:label="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Five Greenwood Industrial Parkway [Member]</link:label>
    <link:label id="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember_documentation_en-US" xlink:label="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Seven Five Greenwood Industrial Parkway</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:href="fr-20251231.xsd#fr_OneSevenFiveGreenwoodIndustrialParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:to="lab_fr_OneSevenFiveGreenwoodIndustrialParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadEastMember_d365c80c-290f-43c9-b73e-86c322777401_terseLabel_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2175 Cactus Road East</link:label>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadEastMember_label_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One Seven Five Cactus Road East [Member]</link:label>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadEastMember_documentation_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two One Seven Five Cactus Road East</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:href="fr-20251231.xsd#fr_TwoOneSevenFiveCactusRoadEastMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:to="lab_fr_TwoOneSevenFiveCactusRoadEastMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock_terseLabel_en-US" xlink:label="lab_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Company Selected Measure</link:label>
    <link:label id="lab_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock_label_en-US" xlink:label="lab_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Company Selected Measure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:to="lab_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSixNineFiveOneWCamelbackRoadMember_a3d91a88-972f-4744-8491-650f6dc8d9e4_terseLabel_en-US" xlink:label="lab_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">16951 W Camelback Road [Member]</link:label>
    <link:label id="lab_fr_OneSixNineFiveOneWCamelbackRoadMember_label_en-US" xlink:label="lab_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Six Nine Five One W Camelback Road [Member]</link:label>
    <link:label id="lab_fr_OneSixNineFiveOneWCamelbackRoadMember_documentation_en-US" xlink:label="lab_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Six Nine Five One W Camelback Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:href="fr-20251231.xsd#fr_OneSixNineFiveOneWCamelbackRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:to="lab_fr_OneSixNineFiveOneWCamelbackRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember_a946c488-56d6-4efc-b308-901d241fce9c_terseLabel_en-US" xlink:label="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22950 Clawiter Road [Member]</link:label>
    <link:label id="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember_label_en-US" xlink:label="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Nine Five Zero Clawiter Road [Member]</link:label>
    <link:label id="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember_documentation_en-US" xlink:label="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Two Nine Five Zero Clawiter Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:href="fr-20251231.xsd#fr_TwoTwoNineFiveZeroClawiterRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:to="lab_fr_TwoTwoNineFiveZeroClawiterRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019c45e1-0bff-7128-bce2-1712733d439a_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPaidFederalAfterRefundReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Paid, Federal, after Refund Received</link:label>
    <link:label id="lab_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPaidFederalAfterRefundReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Paid, Federal, after Refund Received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidFederalAfterRefundReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived" xlink:to="lab_us-gaap_IncomeTaxPaidFederalAfterRefundReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BuildingAndBuildingImprovementsMember_0f145865-8996-49ff-94bb-47ac4cbb69c4_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingAndBuildingImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Buildings and Improvements</link:label>
    <link:label id="lab_us-gaap_BuildingAndBuildingImprovementsMember_label_en-US" xlink:label="lab_us-gaap_BuildingAndBuildingImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Building and Building Improvements [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BuildingAndBuildingImprovementsMember" xlink:to="lab_us-gaap_BuildingAndBuildingImprovementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AllTradingArrangementsMember_terseLabel_en-US" xlink:label="lab_ecd_AllTradingArrangementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Trading Arrangements</link:label>
    <link:label id="lab_ecd_AllTradingArrangementsMember_label_en-US" xlink:label="lab_ecd_AllTradingArrangementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Trading Arrangements [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllTradingArrangementsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllTradingArrangementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="lab_ecd_AllTradingArrangementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_EqtyAwrdsAdjFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments, Footnote</link:label>
    <link:label id="lab_ecd_EqtyAwrdsAdjFnTextBlock_label_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_EqtyAwrdsAdjFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_EqtyAwrdsAdjFnTextBlock" xlink:to="lab_ecd_EqtyAwrdsAdjFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TotalShareholderRtnVsPeerGroupTextBlock_terseLabel_en-US" xlink:label="lab_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Shareholder Return Vs Peer Group</link:label>
    <link:label id="lab_ecd_TotalShareholderRtnVsPeerGroupTextBlock_label_en-US" xlink:label="lab_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Shareholder Return Vs Peer Group [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TotalShareholderRtnVsPeerGroupTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:to="lab_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract_1ad42084-b3de-4ddc-94c8-a3f8e5ddc59a_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2025ATMMember_019c4590-dd1b-7209-b01b-86a1ec486aaa_terseLabel_en-US" xlink:label="lab_fr_A2025ATMMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2025 ATM</link:label>
    <link:label id="lab_fr_A2025ATMMember_label_en-US" xlink:label="lab_fr_A2025ATMMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2025 ATM [Member]</link:label>
    <link:label id="lab_fr_A2025ATMMember_documentation_en-US" xlink:label="lab_fr_A2025ATMMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2025 ATM</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2025ATMMember" xlink:href="fr-20251231.xsd#fr_A2025ATMMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2025ATMMember" xlink:to="lab_fr_A2025ATMMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember_06a91b67-4f90-4dad-8d21-a907e8d6ef41_terseLabel_en-US" xlink:label="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">900-906 Great Southwest Pkwy [Member]</link:label>
    <link:label id="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember_label_en-US" xlink:label="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Zero Zero To Nine Zero Six Great Southwest Pkwy [Member]</link:label>
    <link:label id="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember_documentation_en-US" xlink:label="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine zero zero to nine zero six great southwest pkwy.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:href="fr-20251231.xsd#fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:to="lab_fr_NineZeroZeroToNineZeroSixGreatSouthwestPkwyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0753f34e-a336-4630-9198-4fd7260da48b_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unvested Service Awards / Performance Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7e8c70cb-0a3c-42a4-8fb4-296736377aff_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding, Beginning Balance, Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_830f79b2-824e-4e74-ab38-8d7e6646838b_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding, Ending Balance, Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_d93a418b-fb16-44cb-9bb2-756530bd7b33_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember_ae47b5be-1643-4ad0-9612-20694397b9cb_terseLabel_en-US" xlink:label="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">18150 E. 32nd Place [Member]</link:label>
    <link:label id="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember_label_en-US" xlink:label="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eighteen Thousand One Hundred Fifty E Thirty Two Nd Street [Member]</link:label>
    <link:label id="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember_documentation_en-US" xlink:label="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eighteen thousand one hundred fifty E thirty two nd Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:href="fr-20251231.xsd#fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:to="lab_fr_EighteenThousandOneHundredFiftyEThirtyTwoNdStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember_773f19f4-a28b-4fab-8bde-e7b6bab5ca08_terseLabel_en-US" xlink:label="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2325 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Two Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three two five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeTwoFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeTwoFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ReceivableDueFromAffiliates_f5ea792c-7148-4edf-b45e-570e55941e34_terseLabel_en-US" xlink:label="lab_fr_ReceivableDueFromAffiliates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivable Due From Affiliates</link:label>
    <link:label id="lab_fr_ReceivableDueFromAffiliates_label_en-US" xlink:label="lab_fr_ReceivableDueFromAffiliates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable Due From Affiliates</link:label>
    <link:label id="lab_fr_ReceivableDueFromAffiliates_documentation_en-US" xlink:label="lab_fr_ReceivableDueFromAffiliates" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Receivable Due From Affiliates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ReceivableDueFromAffiliates" xlink:href="fr-20251231.xsd#fr_ReceivableDueFromAffiliates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ReceivableDueFromAffiliates" xlink:to="lab_fr_ReceivableDueFromAffiliates" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadWestMember_7dff4595-a656-4771-bad7-ee3d49d4937a_terseLabel_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2175 Cactus Road West</link:label>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadWestMember_label_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One Seven Five Cactus Road West [Member]</link:label>
    <link:label id="lab_fr_TwoOneSevenFiveCactusRoadWestMember_documentation_en-US" xlink:label="lab_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two One Seven Five Cactus Road West</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:href="fr-20251231.xsd#fr_TwoOneSevenFiveCactusRoadWestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:to="lab_fr_TwoOneSevenFiveCactusRoadWestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourNineFiveOneCatalinaStreetMember_afb2928f-92e9-4dab-b776-caf019dad23e_terseLabel_en-US" xlink:label="lab_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14951 Catalina Street</link:label>
    <link:label id="lab_fr_OneFourNineFiveOneCatalinaStreetMember_label_en-US" xlink:label="lab_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine Five One Catalina Street [Member]</link:label>
    <link:label id="lab_fr_OneFourNineFiveOneCatalinaStreetMember_documentation_en-US" xlink:label="lab_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine Five One Catalina Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:href="fr-20251231.xsd#fr_OneFourNineFiveOneCatalinaStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:to="lab_fr_OneFourNineFiveOneCatalinaStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a331dcd-d805-4b31-865b-10214cffc422_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Cash Provided by Operating Activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFiveFiveFiveAtwaterCourtMember_48f33312-8871-4824-998a-ea26077945d3_terseLabel_en-US" xlink:label="lab_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4555 Atwater Court [Member]</link:label>
    <link:label id="lab_fr_FourFiveFiveFiveAtwaterCourtMember_label_en-US" xlink:label="lab_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Five Five Five Atwater Court [Member]</link:label>
    <link:label id="lab_fr_FourFiveFiveFiveAtwaterCourtMember_documentation_en-US" xlink:label="lab_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four five five five Atwater Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:href="fr-20251231.xsd#fr_FourFiveFiveFiveAtwaterCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:to="lab_fr_FourFiveFiveFiveAtwaterCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandEightHundredWestGreensRoadMember_0076d655-f0f5-4ea1-a414-775e7ac61c04_terseLabel_en-US" xlink:label="lab_fr_FourThousandEightHundredWestGreensRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4800 West Greens Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandEightHundredWestGreensRoadMember_label_en-US" xlink:label="lab_fr_FourThousandEightHundredWestGreensRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand Eight Hundred West Greens Road [Member]</link:label>
    <link:label id="lab_fr_FourThousandEightHundredWestGreensRoadMember_documentation_en-US" xlink:label="lab_fr_FourThousandEightHundredWestGreensRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Thousand Eight Hundred West Greens Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandEightHundredWestGreensRoadMember" xlink:href="fr-20251231.xsd#fr_FourThousandEightHundredWestGreensRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandEightHundredWestGreensRoadMember" xlink:to="lab_fr_FourThousandEightHundredWestGreensRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_bac7dfe8-726c-43a2-b077-cb5a5494afb8_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment, useful life</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Useful Life</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventMember_24c73c47-f861-462d-bc81-9a359472354c_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_us-gaap_SubsequentEventMember_label_en-US" xlink:label="lab_us-gaap_SubsequentEventMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventMember" xlink:to="lab_us-gaap_SubsequentEventMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_835243ec-c27f-4e61-aecf-44171ccf7762_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Award Valuation Assumptions</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateLineItems_48ed84b1-f782-4d98-be9f-446a565e8a40_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate [Line Items]</link:label>
    <link:label id="lab_us-gaap_RealEstateLineItems_label_en-US" xlink:label="lab_us-gaap_RealEstateLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateLineItems" xlink:to="lab_us-gaap_RealEstateLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_EquityValuationAssumptionDifferenceFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Valuation Assumption Difference, Footnote</link:label>
    <link:label id="lab_ecd_EquityValuationAssumptionDifferenceFnTextBlock_label_en-US" xlink:label="lab_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Valuation Assumption Difference, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_EquityValuationAssumptionDifferenceFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:to="lab_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeoTotalCompAmt_terseLabel_en-US" xlink:label="lab_ecd_PeoTotalCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PEO Total Compensation Amount</link:label>
    <link:label id="lab_ecd_PeoTotalCompAmt_label_en-US" xlink:label="lab_ecd_PeoTotalCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PEO Total Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoTotalCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeoTotalCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeoTotalCompAmt" xlink:to="lab_ecd_PeoTotalCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_71718bf7-e861-4e61-8f63-07fe3b5b9906_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis" xlink:to="lab_us-gaap_LongtermDebtTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Depreciation_197dcfa8-43ba-4582-8d30-f92e8480b5ff_terseLabel_en-US" xlink:label="lab_us-gaap_Depreciation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_us-gaap_Depreciation_label_en-US" xlink:label="lab_us-gaap_Depreciation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Depreciation" xlink:to="lab_us-gaap_Depreciation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenFiveFiveEnterpriseDriveMember_36265437-6ea5-4be9-bccc-4c2a469cd88f_terseLabel_en-US" xlink:label="lab_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1755 Enterprise Drive [Member]</link:label>
    <link:label id="lab_fr_OneSevenFiveFiveEnterpriseDriveMember_label_en-US" xlink:label="lab_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Five Five Enterprise Drive [Member]</link:label>
    <link:label id="lab_fr_OneSevenFiveFiveEnterpriseDriveMember_documentation_en-US" xlink:label="lab_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One seven five five enterprise drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:href="fr-20251231.xsd#fr_OneSevenFiveFiveEnterpriseDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:to="lab_fr_OneSevenFiveFiveEnterpriseDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_e057a787-7c87-4a81-ad80-d0d99910b8af_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assumption of Liabilities in Connection with the Acquisition of Real Estate</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities Assumed</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAssumed1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAssumed1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAssumed1" xlink:to="lab_us-gaap_LiabilitiesAssumed1" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember_9e3ff42b-1aab-4b2a-b9a3-df9f98180f27_terseLabel_en-US" xlink:label="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7367 South Revere Parkway [Member]</link:label>
    <link:label id="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember_label_en-US" xlink:label="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Thousand Three Hundred Sixty Seven South Revere Parkway [Member]</link:label>
    <link:label id="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember_documentation_en-US" xlink:label="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven thousand three hundred sixty seven South Revere Parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:href="fr-20251231.xsd#fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:to="lab_fr_SevenThousandThreeHundredSixtySevenSouthRevereParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeNineZeroOneWestMillerRoadMember_138536c7-6273-4e88-a90c-300b0bea1286_terseLabel_en-US" xlink:label="lab_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3901 W Miller Road [Member]</link:label>
    <link:label id="lab_fr_ThreeNineZeroOneWestMillerRoadMember_label_en-US" xlink:label="lab_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Nine Zero One West Miller Road [Member]</link:label>
    <link:label id="lab_fr_ThreeNineZeroOneWestMillerRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Nine Zero One West Miller Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:href="fr-20251231.xsd#fr_ThreeNineZeroOneWestMillerRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:to="lab_fr_ThreeNineZeroOneWestMillerRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenfivezeroGatewayBlvdMember_be3faca4-9f7e-430f-b131-589ea2c4d3c9_terseLabel_en-US" xlink:label="lab_fr_SevenfivezeroGatewayBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">750 Gateway Blvd [Member]</link:label>
    <link:label id="lab_fr_SevenfivezeroGatewayBlvdMember_label_en-US" xlink:label="lab_fr_SevenfivezeroGatewayBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven five zero Gateway Blvd [Member]</link:label>
    <link:label id="lab_fr_SevenfivezeroGatewayBlvdMember_documentation_en-US" xlink:label="lab_fr_SevenfivezeroGatewayBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven five zero Gateway Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenfivezeroGatewayBlvdMember" xlink:href="fr-20251231.xsd#fr_SevenfivezeroGatewayBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenfivezeroGatewayBlvdMember" xlink:to="lab_fr_SevenfivezeroGatewayBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FairValueOnRecurringBasisLineItems_ac2f05e4-97b2-4f40-8ffd-3ef770518746_terseLabel_en-US" xlink:label="lab_fr_FairValueOnRecurringBasisLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value On Recurring Basis [Line Items]</link:label>
    <link:label id="lab_fr_FairValueOnRecurringBasisLineItems_label_en-US" xlink:label="lab_fr_FairValueOnRecurringBasisLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value On Recurring Basis [Line Items]</link:label>
    <link:label id="lab_fr_FairValueOnRecurringBasisLineItems_documentation_en-US" xlink:label="lab_fr_FairValueOnRecurringBasisLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value On Recurring Basis [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FairValueOnRecurringBasisLineItems" xlink:href="fr-20251231.xsd#fr_FairValueOnRecurringBasisLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FairValueOnRecurringBasisLineItems" xlink:to="lab_fr_FairValueOnRecurringBasisLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_06f5f2e0-f6b2-468c-9dde-9a058a91bcb4_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_label_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementEquityComponentsAxis" xlink:to="lab_us-gaap_StatementEquityComponentsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstatePropertiesLineItems_292c940e-2b02-42a4-a9bc-02e234e27ce4_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstatePropertiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Properties [Line Items]</link:label>
    <link:label id="lab_us-gaap_RealEstatePropertiesLineItems_label_en-US" xlink:label="lab_us-gaap_RealEstatePropertiesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Properties [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstatePropertiesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems" xlink:to="lab_us-gaap_RealEstatePropertiesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_97ee16d7-f545-49c9-a1b9-6e2c8836a652_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Line Items]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonRule10b51ArrAdoptedFlag_terseLabel_en-US" xlink:label="lab_ecd_NonRule10b51ArrAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Adopted</link:label>
    <link:label id="lab_ecd_NonRule10b51ArrAdoptedFlag_label_en-US" xlink:label="lab_ecd_NonRule10b51ArrAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Adopted [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonRule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonRule10b51ArrAdoptedFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NonRule10b51ArrAdoptedFlag" xlink:to="lab_ecd_NonRule10b51ArrAdoptedFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoHundredFiftyOneAirportRoadMember_c7dd59fd-732c-4187-9692-7c2a870b7a52_terseLabel_en-US" xlink:label="lab_fr_TwoHundredFiftyOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">251 Airport Road [Member]</link:label>
    <link:label id="lab_fr_TwoHundredFiftyOneAirportRoadMember_label_en-US" xlink:label="lab_fr_TwoHundredFiftyOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Hundred Fifty One Airport Road [Member]</link:label>
    <link:label id="lab_fr_TwoHundredFiftyOneAirportRoadMember_documentation_en-US" xlink:label="lab_fr_TwoHundredFiftyOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two hundred fifty one Airport Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoHundredFiftyOneAirportRoadMember" xlink:href="fr-20251231.xsd#fr_TwoHundredFiftyOneAirportRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoHundredFiftyOneAirportRoadMember" xlink:to="lab_fr_TwoHundredFiftyOneAirportRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_42bae0c3-fdd1-4063-9b73-2157b3f87b8d_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expenses:</link:label>
    <link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_label_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Costs and Expenses [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpensesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpensesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract" xlink:to="lab_us-gaap_OperatingCostsAndExpensesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember_b1e0ce37-ea08-4a3e-bf3a-21665ea89269_terseLabel_en-US" xlink:label="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">12874 Westmore Avenue [Member]</link:label>
    <link:label id="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember_label_en-US" xlink:label="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Eight Seven Four Westmore Avenue [Member]</link:label>
    <link:label id="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember_documentation_en-US" xlink:label="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One two eight seven four Westmore Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:href="fr-20251231.xsd#fr_OneTwoEightSevenFourWestmoreAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:to="lab_fr_OneTwoEightSevenFourWestmoreAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSixThreeZeroThirtyFirstStreetMember_457a22e8-e4e9-4bd4-bfe5-1d1bf2052116_terseLabel_en-US" xlink:label="lab_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8630 31st Street</link:label>
    <link:label id="lab_fr_EightSixThreeZeroThirtyFirstStreetMember_label_en-US" xlink:label="lab_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Six Three Zero Thirty First Street [Member]</link:label>
    <link:label id="lab_fr_EightSixThreeZeroThirtyFirstStreetMember_documentation_en-US" xlink:label="lab_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Six Three Zero Thirty First Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:href="fr-20251231.xsd#fr_EightSixThreeZeroThirtyFirstStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:to="lab_fr_EightSixThreeZeroThirtyFirstStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember_86184f44-1478-48dc-a0a9-4b21d2dfcdf8_terseLabel_en-US" xlink:label="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1501 NW 64th Street</link:label>
    <link:label id="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember_label_en-US" xlink:label="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Five Zero One NW Sixty Fourth Street [Member]</link:label>
    <link:label id="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember_documentation_en-US" xlink:label="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Five Zero One NW Sixty Fourth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:href="fr-20251231.xsd#fr_OneFiveZeroOneNWSixtyFourthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:to="lab_fr_OneFiveZeroOneNWSixtyFourthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LoansPayable_ca1815c9-114c-477e-9e33-217a980da73d_terseLabel_en-US" xlink:label="lab_us-gaap_LoansPayable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans Payable</link:label>
    <link:label id="lab_us-gaap_LoansPayable_label_en-US" xlink:label="lab_us-gaap_LoansPayable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansPayable" xlink:to="lab_us-gaap_LoansPayable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFiveFiveThreeBandiniBlvdMember_6b6969b6-e853-4e9a-a88b-c179a78dface_terseLabel_en-US" xlink:label="lab_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5553 Bandini Blvd [Member]</link:label>
    <link:label id="lab_fr_FiveFiveFiveThreeBandiniBlvdMember_label_en-US" xlink:label="lab_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Five Five Three Bandini Blvd [Member]</link:label>
    <link:label id="lab_fr_FiveFiveFiveThreeBandiniBlvdMember_documentation_en-US" xlink:label="lab_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Five Five Three Bandini Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:href="fr-20251231.xsd#fr_FiveFiveFiveThreeBandiniBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:to="lab_fr_FiveFiveFiveThreeBandiniBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions_6adafd95-e9a9-43eb-842d-e8fa8edde6d4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">(Increase) Decrease in Escrow Deposits</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Deposits on Real Estate Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions" xlink:to="lab_us-gaap_PaymentsForProceedsFromDepositsOnRealEstateAcquisitions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember_a43fb2d2-7aab-42ee-b294-408cd35ee76f_terseLabel_en-US" xlink:label="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">21301 E. 33rd Drive [Member]</link:label>
    <link:label id="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember_label_en-US" xlink:label="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One Three Zero One East Thirty Third Drive [Member]</link:label>
    <link:label id="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember_documentation_en-US" xlink:label="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two One Three Zero One East Thirty Third Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:href="fr-20251231.xsd#fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:to="lab_fr_TwoOneThreeZeroOneEastThirtyThirdDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AociAttributableToNoncontrollingInterestMember_747bedc5-7c00-4611-8fbd-24dcb54a38d7_terseLabel_en-US" xlink:label="lab_us-gaap_AociAttributableToNoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Comprehensive (Loss) Income Attributable to Noncontrolling Interest</link:label>
    <link:label id="lab_us-gaap_AociAttributableToNoncontrollingInterestMember_label_en-US" xlink:label="lab_us-gaap_AociAttributableToNoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AOCI Attributable to Noncontrolling Interest [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociAttributableToNoncontrollingInterestMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociAttributableToNoncontrollingInterestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AociAttributableToNoncontrollingInterestMember" xlink:to="lab_us-gaap_AociAttributableToNoncontrollingInterestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroZeroMaddoxRoadMember_019c48a2-5af0-7ea5-9940-9194370f2ad2_terseLabel_en-US" xlink:label="lab_fr_EightZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">800 Maddox Road</link:label>
    <link:label id="lab_fr_EightZeroZeroMaddoxRoadMember_label_en-US" xlink:label="lab_fr_EightZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero Zero Maddox Road [Member]</link:label>
    <link:label id="lab_fr_EightZeroZeroMaddoxRoadMember_documentation_en-US" xlink:label="lab_fr_EightZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Zero Zero Maddox Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroZeroMaddoxRoadMember" xlink:href="fr-20251231.xsd#fr_EightZeroZeroMaddoxRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroZeroMaddoxRoadMember" xlink:to="lab_fr_EightZeroZeroMaddoxRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_193f5862-8504-466b-83e1-4478d80190e0_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entities</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:to="lab_us-gaap_VariableInterestEntityDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressStateOrProvince_974e7e9e-35fb-4ca0-9b4f-6518f3bc362c_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:label id="lab_dei_EntityAddressStateOrProvince_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateOtherAcquisitions_0ef2fc3c-22b4-4065-bc39-355dd1e93ecb_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateOtherAcquisitions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition of Real Estate Assets</link:label>
    <link:label id="lab_us-gaap_RealEstateOtherAcquisitions_label_en-US" xlink:label="lab_us-gaap_RealEstateOtherAcquisitions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Acquisition</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherAcquisitions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateOtherAcquisitions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateOtherAcquisitions" xlink:to="lab_us-gaap_RealEstateOtherAcquisitions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember_9d681d16-f643-4f68-bea9-d592f4b78c92_terseLabel_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">200 Cascade Drive, Bldg. 2 [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember_label_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Zero Cascade Drive Bldg Two [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember_documentation_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero zero Cascade Drive, Bldg. Two.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:href="fr-20251231.xsd#fr_TwoZeroZeroCascadeDriveBldgTwoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:to="lab_fr_TwoZeroZeroCascadeDriveBldgTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreenineninesixScientificDriveMember_189db641-f567-4706-98ab-0d97f6c7da3c_terseLabel_en-US" xlink:label="lab_fr_ThreenineninesixScientificDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3996 Scientific Drive [Member]</link:label>
    <link:label id="lab_fr_ThreenineninesixScientificDriveMember_label_en-US" xlink:label="lab_fr_ThreenineninesixScientificDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three nine nine six Scientific Drive [Member]</link:label>
    <link:label id="lab_fr_ThreenineninesixScientificDriveMember_documentation_en-US" xlink:label="lab_fr_ThreenineninesixScientificDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three nine nine six Scientific Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreenineninesixScientificDriveMember" xlink:href="fr-20251231.xsd#fr_ThreenineninesixScientificDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreenineninesixScientificDriveMember" xlink:to="lab_fr_ThreenineninesixScientificDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember_13882a0b-1254-4920-a012-ab5ed62d624f_terseLabel_en-US" xlink:label="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2345 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Four Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three four five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeFourFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeFourFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember_9e08168d-925c-4abc-aa05-35a0fda7363a_terseLabel_en-US" xlink:label="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2900 W. 166th Street [Member]</link:label>
    <link:label id="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember_label_en-US" xlink:label="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Nine Hundred W One Hundred Sixty Six Th Street [Member]</link:label>
    <link:label id="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember_documentation_en-US" xlink:label="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand nine hundred W one hundred sixty six th Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:href="fr-20251231.xsd#fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:to="lab_fr_TwoThousandNineHundredWOneHundredSixtySixThStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_IndividualAxis_terseLabel_en-US" xlink:label="lab_ecd_IndividualAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Individual:</link:label>
    <link:label id="lab_ecd_IndividualAxis_label_en-US" xlink:label="lab_ecd_IndividualAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Individual [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_IndividualAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_IndividualAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_IndividualAxis" xlink:to="lab_ecd_IndividualAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFiveZeroGillsDriveMember_0530dd28-304f-421b-9339-c2a77b741e14_terseLabel_en-US" xlink:label="lab_fr_FourFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">450 Gills Drive [Member]</link:label>
    <link:label id="lab_fr_FourFiveZeroGillsDriveMember_label_en-US" xlink:label="lab_fr_FourFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Five Zero Gills Drive [Member]</link:label>
    <link:label id="lab_fr_FourFiveZeroGillsDriveMember_documentation_en-US" xlink:label="lab_fr_FourFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Five Zero Gills Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFiveZeroGillsDriveMember" xlink:href="fr-20251231.xsd#fr_FourFiveZeroGillsDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFiveZeroGillsDriveMember" xlink:to="lab_fr_FourFiveZeroGillsDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_5e415e8c-fd8a-49d5-bcee-1e28f3cc3046_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxAuthorityDomain_019c45e4-4500-7336-a900-aebc0e02dc68_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxAuthorityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Jurisdiction [Domain]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxAuthorityDomain_label_en-US" xlink:label="lab_us-gaap_IncomeTaxAuthorityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Jurisdiction [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain" xlink:to="lab_us-gaap_IncomeTaxAuthorityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_b8e468d2-1577-44cc-ab24-7d1b3553d6e3_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Common Stock Dividends and Unit Distributions Paid</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Ordinary Dividends, Common Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDividendsCommonStock" xlink:to="lab_us-gaap_PaymentsOfDividendsCommonStock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentAnnualReport_846b6317-3f12-4a84-9e4f-4ce182877dc9_terseLabel_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Annual Report</link:label>
    <link:label id="lab_dei_DocumentAnnualReport_label_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Annual Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAnnualReport" xlink:to="lab_dei_DocumentAnnualReport" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember_1ed0272e-7a94-4be6-9cbc-ad7880f49f52_terseLabel_en-US" xlink:label="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4160-4170 Business Center Drive [Member]</link:label>
    <link:label id="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember_label_en-US" xlink:label="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four One Six Zero through Four One Seven Zero Business Center Drive [Member]</link:label>
    <link:label id="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember_documentation_en-US" xlink:label="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four One Six Zero through Four One Seven Zero Business Center Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:href="fr-20251231.xsd#fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:to="lab_fr_FourOneSixZeroThroughFourOneSevenZeroBusinessCenterDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember_dd5083d7-a6f5-417d-9973-e9ff107f114d_terseLabel_en-US" xlink:label="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">19302-19400 S Laurel Park [Member]</link:label>
    <link:label id="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember_label_en-US" xlink:label="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Three Zero Two through One Nine Four Zero Zero S Laurel Park [Member]</link:label>
    <link:label id="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember_documentation_en-US" xlink:label="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Nine Three Zero Two through One Nine Four Zero Zero S Laurel Park</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:href="fr-20251231.xsd#fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:to="lab_fr_OneNineThreeZeroTwoThroughOneNineFourZeroZeroSLaurelParkMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue_e9be97d5-92b5-4277-a1bf-cb63f71bd416_terseLabel_en-US" xlink:label="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value of Performance Awards/Service Awards issued</link:label>
    <link:label id="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue_label_en-US" xlink:label="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Grant Date Fair Value</link:label>
    <link:label id="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue_documentation_en-US" xlink:label="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value at approval date of non-option equity instruments granted during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:href="fr-20251231.xsd#fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:to="lab_fr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember_f16151ea-59c7-4b18-b4bc-090a4f43821b_terseLabel_en-US" xlink:label="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8201 NW 87th Avenue</link:label>
    <link:label id="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember_label_en-US" xlink:label="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Two Zero One NW Eighty Seventh Avenue [Member]</link:label>
    <link:label id="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember_documentation_en-US" xlink:label="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Two Zero One NW Eighty Seventh Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:href="fr-20251231.xsd#fr_EightTwoZeroOneNWEightySeventhAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:to="lab_fr_EightTwoZeroOneNWEightySeventhAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromMinorityShareholders_1810b170-2e4b-474f-b2dc-c2756dab7577_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMinorityShareholders" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contributions from Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_ProceedsFromMinorityShareholders_label_en-US" xlink:label="lab_us-gaap_ProceedsFromMinorityShareholders" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Noncontrolling Interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromMinorityShareholders" xlink:to="lab_us-gaap_ProceedsFromMinorityShareholders" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock_terseLabel_en-US" xlink:label="lab_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forgone Recovery, Explanation of Impracticability</link:label>
    <link:label id="lab_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock_label_en-US" xlink:label="lab_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forgone Recovery, Explanation of Impracticability [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:to="lab_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherDepreciationAndAmortization_f2ec61fc-2011-45ea-94f1-662f4cac1f96_terseLabel_en-US" xlink:label="lab_us-gaap_OtherDepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Amortization, Including Equity Based Compensation</link:label>
    <link:label id="lab_us-gaap_OtherDepreciationAndAmortization_label_en-US" xlink:label="lab_us-gaap_OtherDepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Depreciation and Amortization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDepreciationAndAmortization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherDepreciationAndAmortization" xlink:to="lab_us-gaap_OtherDepreciationAndAmortization" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_099b89bf-a6a5-4722-82b5-b8ad3e4c1539_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Limited partners' ownership interest in the Operating Partnership</link:label>
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_label_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiary, Ownership Percentage, Noncontrolling Owner</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:to="lab_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_82cf17e6-7598-4137-b52c-5dbbfc621afe_terseLabel_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_label_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent" xlink:to="lab_dei_EntityInteractiveDataCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFiveSevenZeroTulaneDriveDMember_ec46d911-4002-464d-914a-cdd0542464b8_terseLabel_en-US" xlink:label="lab_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5570 Tulane Dr [Member]</link:label>
    <link:label id="lab_fr_FiveFiveSevenZeroTulaneDriveDMember_label_en-US" xlink:label="lab_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Five Seven Zero Tulane Drive D [Member]</link:label>
    <link:label id="lab_fr_FiveFiveSevenZeroTulaneDriveDMember_documentation_en-US" xlink:label="lab_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five five seven zero Tulane Drive D.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:href="fr-20251231.xsd#fr_FiveFiveSevenZeroTulaneDriveDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:to="lab_fr_FiveFiveSevenZeroTulaneDriveDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember_02841020-c4cf-4244-bbb5-9b75d60ce5c9_terseLabel_en-US" xlink:label="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4323 Oscar Nelson Jr. Drive</link:label>
    <link:label id="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember_label_en-US" xlink:label="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Three Two Three Oscar Nelson Jr Drive [Member]</link:label>
    <link:label id="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember_documentation_en-US" xlink:label="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Three Two Three Oscar Nelson Jr Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:href="fr-20251231.xsd#fr_FourThreeTwoThreeOscarNelsonJrDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:to="lab_fr_FourThreeTwoThreeOscarNelsonJrDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnersCapitalAccountContributions_c610965c-33ca-4397-bd3b-3a43d8a2b812_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountContributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contributions from Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_PartnersCapitalAccountContributions_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountContributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital Account, Contributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountContributions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalAccountContributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalAccountContributions" xlink:to="lab_us-gaap_PartnersCapitalAccountContributions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember_791b16d3-85b4-42e1-b0d5-7d0c641d9d17_terseLabel_en-US" xlink:label="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">42555 Merrill Road [Member]</link:label>
    <link:label id="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember_label_en-US" xlink:label="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Two Five Five Five Merrill Road [Member]</link:label>
    <link:label id="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember_documentation_en-US" xlink:label="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four two five five five Merrill Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:href="fr-20251231.xsd#fr_FourTwoFiveFiveFiveMerrillRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:to="lab_fr_FourTwoFiveFiveFiveMerrillRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenTwoOneIrontonStreetMember_70197736-8de6-41f8-8da1-8e11edc9d73a_terseLabel_en-US" xlink:label="lab_fr_FourSevenTwoOneIrontonStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4721 Ironton Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenTwoOneIrontonStreetMember_label_en-US" xlink:label="lab_fr_FourSevenTwoOneIrontonStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Two One Ironton Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenTwoOneIrontonStreetMember_documentation_en-US" xlink:label="lab_fr_FourSevenTwoOneIrontonStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Seven Two One Ironton Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenTwoOneIrontonStreetMember" xlink:href="fr-20251231.xsd#fr_FourSevenTwoOneIrontonStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenTwoOneIrontonStreetMember" xlink:to="lab_fr_FourSevenTwoOneIrontonStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SettlementOfDerivativeInstruments_019c43a2-9190-7ab4-a521-f318de5ce197_terseLabel_en-US" xlink:label="lab_fr_SettlementOfDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Settlement of Derivative Instruments</link:label>
    <link:label id="lab_fr_SettlementOfDerivativeInstruments_label_en-US" xlink:label="lab_fr_SettlementOfDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Settlement of Derivative Instruments</link:label>
    <link:label id="lab_fr_SettlementOfDerivativeInstruments_documentation_en-US" xlink:label="lab_fr_SettlementOfDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Settlement of Derivative Instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SettlementOfDerivativeInstruments" xlink:href="fr-20251231.xsd#fr_SettlementOfDerivativeInstruments"/>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingLiabilities_f5cef5a6-4725-450b-a267-3a6fcf1c59fa_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingLiabilities_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilities" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember_c3bd9f39-41c3-43b9-b32f-5b527eebffe1_terseLabel_en-US" xlink:label="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1385 101st Street [Member]</link:label>
    <link:label id="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember_label_en-US" xlink:label="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Thirteen Eighty Five And One Hundred One St Street [Member]</link:label>
    <link:label id="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember_documentation_en-US" xlink:label="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Thirteen Eighty Five And One Hundred One St Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:href="fr-20251231.xsd#fr_ThirteenEightyFiveAndOneHundredOneStStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:to="lab_fr_ThirteenEightyFiveAndOneHundredOneStStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroFourTwoSGroveAvenueMember_4a150d59-8ac2-4777-9aa7-596033723048_terseLabel_en-US" xlink:label="lab_fr_TwoZeroFourTwoSGroveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2042 S. Grove Avenue</link:label>
    <link:label id="lab_fr_TwoZeroFourTwoSGroveAvenueMember_label_en-US" xlink:label="lab_fr_TwoZeroFourTwoSGroveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Four Two S Grove Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoZeroFourTwoSGroveAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoZeroFourTwoSGroveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Four Two S Grove Avenue</link:label>
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    <link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_4869d017-a287-4c98-8f8a-02930f40608a_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Performance Award Transactions</link:label>
    <link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_label_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:to="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FinitelivedIntangibleLiabilitiesAcquired_d105173d-c56b-49f9-a8cc-659fc9c67e42_negatedTerseLabel_en-US" xlink:label="lab_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Acquired Finite-lived Intangible Liabilities, Fair Value</link:label>
    <link:label id="lab_fr_FinitelivedIntangibleLiabilitiesAcquired_label_en-US" xlink:label="lab_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-lived Intangible Liabilities Acquired</link:label>
    <link:label id="lab_fr_FinitelivedIntangibleLiabilitiesAcquired_documentation_en-US" xlink:label="lab_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finite-lived Intangible Liabilities Acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:href="fr-20251231.xsd#fr_FinitelivedIntangibleLiabilitiesAcquired"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:to="lab_fr_FinitelivedIntangibleLiabilitiesAcquired" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember_a17ed0df-46a5-49ac-bcc4-3cf2cdef31e5_terseLabel_en-US" xlink:label="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1602-1654 Terre Colony [Member]</link:label>
    <link:label id="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember_label_en-US" xlink:label="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Six Zero Two To One Six Five Four Terre Colony [Member]</link:label>
    <link:label id="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember_documentation_en-US" xlink:label="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One six zero two to one six five four Terre Colony.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:href="fr-20251231.xsd#fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:to="lab_fr_OneSixZeroTwoToOneSixFiveFourTerreColonyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourNineNineNineSummitDriveMember_9afe486c-e52c-46f7-af37-6a0fbdadeb56_terseLabel_en-US" xlink:label="lab_fr_OneFourNineNineNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14999 Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineNineNineSummitDriveMember_label_en-US" xlink:label="lab_fr_OneFourNineNineNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine Nine Nine Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineNineNineSummitDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourNineNineNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine Nine Nine Summit Drive [Member]</link:label>
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    <link:label id="lab_fr_SixOneFiveEastSamHoustonParkwayMember_bb9e0be0-164c-4736-a3f5-29203dcd6776_terseLabel_en-US" xlink:label="lab_fr_SixOneFiveEastSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">615 East Sam Houston Parkway [Member]</link:label>
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    <link:label id="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember_9f5cf4c1-78d2-4859-9826-6b12e9087ef4_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3350 North Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember_label_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Five Zero North Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Three Five Zero North Cotton Lane</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7869fe50-8140-4390-b4bb-c00128a1ce16_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstParkMiamiBuilding4Member_019c48b7-062e-7d0f-aec9-70b5bfffd6f9_terseLabel_en-US" xlink:label="lab_fr_FirstParkMiamiBuilding4Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Park Miami Building 4</link:label>
    <link:label id="lab_fr_FirstParkMiamiBuilding4Member_label_en-US" xlink:label="lab_fr_FirstParkMiamiBuilding4Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Park Miami Building 4 [Member]</link:label>
    <link:label id="lab_fr_FirstParkMiamiBuilding4Member_documentation_en-US" xlink:label="lab_fr_FirstParkMiamiBuilding4Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Park Miami Building 4</link:label>
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    <link:label id="lab_srt_OwnershipDomain_31941570-2503-43db-a118-dd9264eb6e1d_terseLabel_en-US" xlink:label="lab_srt_OwnershipDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Domain]</link:label>
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    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand_7e0ad8e9-b285-42f9-9ff2-0bdf528d355d_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land</link:label>
    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand_label_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand" xlink:to="lab_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember_d4881197-4fd9-4744-925b-6c0b98b314ab_terseLabel_en-US" xlink:label="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3737 84th Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember_label_en-US" xlink:label="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Seven Three Seven Eighty Fourth Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember_documentation_en-US" xlink:label="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Seven Three Seven Eighty Fourth Avenue [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeSevenThreeSevenEightyFourthAvenueMember" xlink:to="lab_fr_ThreeSevenThreeSevenEightyFourthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFourFourFourFMOneFourZeroFiveMember_f7a297a6-7786-45e3-bebc-486944d99586_terseLabel_en-US" xlink:label="lab_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4444 FM 1405</link:label>
    <link:label id="lab_fr_FourFourFourFourFMOneFourZeroFiveMember_label_en-US" xlink:label="lab_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Four Four Four FM One Four Zero Five [Member]</link:label>
    <link:label id="lab_fr_FourFourFourFourFMOneFourZeroFiveMember_documentation_en-US" xlink:label="lab_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Four Four Four FM One Four Zero Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:href="fr-20251231.xsd#fr_FourFourFourFourFMOneFourZeroFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:to="lab_fr_FourFourFourFourFMOneFourZeroFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock_ea5e2967-3193-4070-90a9-3db8a7bbb88c_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payments to be Received, Maturity</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedMaturityTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PurchasePriceOfLand_8e9e0327-41fe-4faf-a49f-8546050252c5_terseLabel_en-US" xlink:label="lab_fr_PurchasePriceOfLand" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase Price of Land Parcels Acquired</link:label>
    <link:label id="lab_fr_PurchasePriceOfLand_label_en-US" xlink:label="lab_fr_PurchasePriceOfLand" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price of Land</link:label>
    <link:label id="lab_fr_PurchasePriceOfLand_documentation_en-US" xlink:label="lab_fr_PurchasePriceOfLand" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase Price of Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PurchasePriceOfLand" xlink:href="fr-20251231.xsd#fr_PurchasePriceOfLand"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PurchasePriceOfLand" xlink:to="lab_fr_PurchasePriceOfLand" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveNineSixBonnieValentineMember_3fb6d093-c4aa-4c7f-a45f-db52c3969617_terseLabel_en-US" xlink:label="lab_fr_FiveNineSixBonnieValentineMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">596 Bonnie Valentine [Member]</link:label>
    <link:label id="lab_fr_FiveNineSixBonnieValentineMember_label_en-US" xlink:label="lab_fr_FiveNineSixBonnieValentineMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Nine Six Bonnie Valentine [Member]</link:label>
    <link:label id="lab_fr_FiveNineSixBonnieValentineMember_documentation_en-US" xlink:label="lab_fr_FiveNineSixBonnieValentineMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five nine six bonnie valentine.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveNineSixBonnieValentineMember" xlink:href="fr-20251231.xsd#fr_FiveNineSixBonnieValentineMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveNineSixBonnieValentineMember" xlink:to="lab_fr_FiveNineSixBonnieValentineMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveHundredOldPostRoadMember_3e72920a-035e-4af9-96d2-3595bfa8f1fc_terseLabel_en-US" xlink:label="lab_fr_FiveHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">500 Old Post Road [Member]</link:label>
    <link:label id="lab_fr_FiveHundredOldPostRoadMember_label_en-US" xlink:label="lab_fr_FiveHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Hundred Old Post Road [Member]</link:label>
    <link:label id="lab_fr_FiveHundredOldPostRoadMember_documentation_en-US" xlink:label="lab_fr_FiveHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Hundred Old Post Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveHundredOldPostRoadMember" xlink:href="fr-20251231.xsd#fr_FiveHundredOldPostRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveHundredOldPostRoadMember" xlink:to="lab_fr_FiveHundredOldPostRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSixFourNineKieferBoulevardMember_0f968161-304e-4db0-9305-8403a2ac9fc8_terseLabel_en-US" xlink:label="lab_fr_EightSixFourNineKieferBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8649 Kiefer Boulevard</link:label>
    <link:label id="lab_fr_EightSixFourNineKieferBoulevardMember_label_en-US" xlink:label="lab_fr_EightSixFourNineKieferBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Six Four Nine Kiefer Boulevard [Member]</link:label>
    <link:label id="lab_fr_EightSixFourNineKieferBoulevardMember_documentation_en-US" xlink:label="lab_fr_EightSixFourNineKieferBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Six Four Nine Kiefer Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSixFourNineKieferBoulevardMember" xlink:href="fr-20251231.xsd#fr_EightSixFourNineKieferBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSixFourNineKieferBoulevardMember" xlink:to="lab_fr_EightSixFourNineKieferBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroZeroOneMidwayRoadMember_269d5a84-ed67-45e9-9d28-527fa6a0f319_terseLabel_en-US" xlink:label="lab_fr_TwoZeroZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2001 Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroOneMidwayRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Zero One Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroOneMidwayRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Zero One Midway Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroZeroOneMidwayRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroZeroOneMidwayRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroZeroOneMidwayRoadMember" xlink:to="lab_fr_TwoZeroZeroOneMidwayRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorTable_58b1871d-6160-4e91-bc40-41b3cac0d133_terseLabel_en-US" xlink:label="lab_dei_AuditorTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor [Table]</link:label>
    <link:label id="lab_dei_AuditorTable_label_en-US" xlink:label="lab_dei_AuditorTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorTable" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorTable" xlink:to="lab_dei_AuditorTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_efd70a8f-e5ab-4740-b161-c92748681b83_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeoName_terseLabel_en-US" xlink:label="lab_ecd_PeoName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PEO Name</link:label>
    <link:label id="lab_ecd_PeoName_label_en-US" xlink:label="lab_ecd_PeoName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PEO Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeoName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeoName" xlink:to="lab_ecd_PeoName" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BelowMarketLeaseNet_798f5449-b8b4-4f86-8d21-8fb0cc304ad5_terseLabel_en-US" xlink:label="lab_us-gaap_BelowMarketLeaseNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total deferred leasing intangibles, net, included in total liabilities</link:label>
    <link:label id="lab_us-gaap_BelowMarketLeaseNet_label_en-US" xlink:label="lab_us-gaap_BelowMarketLeaseNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Below Market Lease, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BelowMarketLeaseNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BelowMarketLeaseNet" xlink:to="lab_us-gaap_BelowMarketLeaseNet" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_145a742e-56c0-4551-ab26-238a06296f13_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Maturities</link:label>
    <link:label id="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Maturities of Long-Term Debt [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Revenues_5bd8f18f-ab06-4db4-be0d-79f1a1d87bf7_totalLabel_en-US" xlink:label="lab_us-gaap_Revenues" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Revenues</link:label>
    <link:label id="lab_us-gaap_Revenues_label_en-US" xlink:label="lab_us-gaap_Revenues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues" xlink:to="lab_us-gaap_Revenues" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember_terseLabel_en-US" xlink:label="lab_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year</link:label>
    <link:label id="lab_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember_label_en-US" xlink:label="lab_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:to="lab_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineTwoOneOneOldPikeWayMember_019c4897-05c0-756d-a7eb-69187935c73e_terseLabel_en-US" xlink:label="lab_fr_NineTwoOneOneOldPikeWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9211 Old Pike Way</link:label>
    <link:label id="lab_fr_NineTwoOneOneOldPikeWayMember_label_en-US" xlink:label="lab_fr_NineTwoOneOneOldPikeWayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Two One One Old Pike Way [Member]</link:label>
    <link:label id="lab_fr_NineTwoOneOneOldPikeWayMember_documentation_en-US" xlink:label="lab_fr_NineTwoOneOneOldPikeWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Two One One Old Pike Way</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineTwoOneOneOldPikeWayMember" xlink:href="fr-20251231.xsd#fr_NineTwoOneOneOldPikeWayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineTwoOneOneOldPikeWayMember" xlink:to="lab_fr_NineTwoOneOneOldPikeWayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_QualifiedDividend_3c8b55f9-946e-467d-854a-0fe23e76c1be_terseLabel_en-US" xlink:label="lab_fr_QualifiedDividend" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Qualified Dividend</link:label>
    <link:label id="lab_fr_QualifiedDividend_label_en-US" xlink:label="lab_fr_QualifiedDividend" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Qualified Dividend</link:label>
    <link:label id="lab_fr_QualifiedDividend_documentation_en-US" xlink:label="lab_fr_QualifiedDividend" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Qualified Dividend</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_QualifiedDividend" xlink:href="fr-20251231.xsd#fr_QualifiedDividend"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_QualifiedDividend" xlink:to="lab_fr_QualifiedDividend" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_OutstandingAggtErrCompAmt_terseLabel_en-US" xlink:label="lab_ecd_OutstandingAggtErrCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding Aggregate Erroneous Compensation Amount</link:label>
    <link:label id="lab_ecd_OutstandingAggtErrCompAmt_label_en-US" xlink:label="lab_ecd_OutstandingAggtErrCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Outstanding Aggregate Erroneous Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingAggtErrCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_OutstandingAggtErrCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_OutstandingAggtErrCompAmt" xlink:to="lab_ecd_OutstandingAggtErrCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSixFiveSixZeroWestSellsDriveMember_374e7e52-136e-47b3-9faf-3440af9ca2b5_terseLabel_en-US" xlink:label="lab_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">16560 West Sells Drive [Member]</link:label>
    <link:label id="lab_fr_OneSixFiveSixZeroWestSellsDriveMember_label_en-US" xlink:label="lab_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Six Five Six Zero West Sells Drive [Member]</link:label>
    <link:label id="lab_fr_OneSixFiveSixZeroWestSellsDriveMember_documentation_en-US" xlink:label="lab_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Six Five Six Zero West Sells Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:href="fr-20251231.xsd#fr_OneSixFiveSixZeroWestSellsDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:to="lab_fr_OneSixFiveSixZeroWestSellsDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightSevenZeroSevilleAvenueMember_79c9d804-97a6-45d0-9676-401ee0ab5eea_terseLabel_en-US" xlink:label="lab_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3870 Seville Avenue</link:label>
    <link:label id="lab_fr_ThreeEightSevenZeroSevilleAvenueMember_label_en-US" xlink:label="lab_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Seven Zero Seville Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeEightSevenZeroSevilleAvenueMember_documentation_en-US" xlink:label="lab_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Seven Zero Seville Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:href="fr-20251231.xsd#fr_ThreeEightSevenZeroSevilleAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:to="lab_fr_ThreeEightSevenZeroSevilleAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIIMember_79128be8-8846-467f-8e23-43521f085f43_terseLabel_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Park 33 Building II</link:label>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIIMember_label_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Park Thirty Three Building II [Member]</link:label>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIIMember_documentation_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Park Thirty Three Building II</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FirstParkThirtyThreeBuildingIIMember" xlink:href="fr-20251231.xsd#fr_FirstParkThirtyThreeBuildingIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FirstParkThirtyThreeBuildingIIMember" xlink:to="lab_fr_FirstParkThirtyThreeBuildingIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember_69cd53ad-fd27-4ad5-af75-2c92252b09ec_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3337-3347 Rauch Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember_label_en-US" xlink:label="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Three Seven And Three Three Four Seven Rauch Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three three three seven and three three four seven Rauch Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:to="lab_fr_ThreeThreeThreeSevenAndThreeThreeFourSevenRauchStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardExrcPrice_terseLabel_en-US" xlink:label="lab_ecd_AwardExrcPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise Price</link:label>
    <link:label id="lab_ecd_AwardExrcPrice_label_en-US" xlink:label="lab_ecd_AwardExrcPrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Exercise Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardExrcPrice" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardExrcPrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardExrcPrice" xlink:to="lab_ecd_AwardExrcPrice" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFilerCategory_c308274f-1cf9-467e-b876-772eac1ee1eb_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:label id="lab_dei_EntityFilerCategory_label_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory" xlink:to="lab_dei_EntityFilerCategory" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeOneSevenFiveWilsonAvenueMember_f0c74328-eb2e-4853-9747-290e39aea59e_terseLabel_en-US" xlink:label="lab_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3175 Wilson Avenue</link:label>
    <link:label id="lab_fr_ThreeOneSevenFiveWilsonAvenueMember_label_en-US" xlink:label="lab_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three One Seven Five Wilson Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeOneSevenFiveWilsonAvenueMember_documentation_en-US" xlink:label="lab_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three One Seven Five Wilson Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:href="fr-20251231.xsd#fr_ThreeOneSevenFiveWilsonAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:to="lab_fr_ThreeOneSevenFiveWilsonAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ClassOfStockDomain_0cbdcf61-9f89-4336-a839-1a0ceb762499_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassOfStockDomain_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain" xlink:to="lab_us-gaap_ClassOfStockDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixOneEightFiveKimballAveMember_2a0bd0f8-c380-4e94-86db-f1fe8c74487b_terseLabel_en-US" xlink:label="lab_fr_SixOneEightFiveKimballAveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6185 Kimball Ave [Member]</link:label>
    <link:label id="lab_fr_SixOneEightFiveKimballAveMember_label_en-US" xlink:label="lab_fr_SixOneEightFiveKimballAveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six One Eight Five Kimball Ave [Member]</link:label>
    <link:label id="lab_fr_SixOneEightFiveKimballAveMember_documentation_en-US" xlink:label="lab_fr_SixOneEightFiveKimballAveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six One Eight Five Kimball Ave [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixOneEightFiveKimballAveMember" xlink:href="fr-20251231.xsd#fr_SixOneEightFiveKimballAveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixOneEightFiveKimballAveMember" xlink:to="lab_fr_SixOneEightFiveKimballAveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeSevenFiveRivertownDriveMember_f47b2ec1-24d7-426f-8007-25ee27df28a2_terseLabel_en-US" xlink:label="lab_fr_ThreeSevenFiveRivertownDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">375 Rivertown Drive [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenFiveRivertownDriveMember_label_en-US" xlink:label="lab_fr_ThreeSevenFiveRivertownDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Seven Five Rivertown Drive [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenFiveRivertownDriveMember_documentation_en-US" xlink:label="lab_fr_ThreeSevenFiveRivertownDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">375 Rivertown Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeSevenFiveRivertownDriveMember" xlink:href="fr-20251231.xsd#fr_ThreeSevenFiveRivertownDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeSevenFiveRivertownDriveMember" xlink:to="lab_fr_ThreeSevenFiveRivertownDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventTypeAxis_ad735ed9-78ae-4771-ba6b-2c6dc26c77d7_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTypeAxis_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTypeAxis" xlink:to="lab_us-gaap_SubsequentEventTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFourOneZeroOswegoStreetMember_ed7c1f2b-6608-4ee1-98e5-cf7cd7060a04_terseLabel_en-US" xlink:label="lab_fr_FiveFourOneZeroOswegoStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5401 Oswego [Member]</link:label>
    <link:label id="lab_fr_FiveFourOneZeroOswegoStreetMember_label_en-US" xlink:label="lab_fr_FiveFourOneZeroOswegoStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Four One Zero Oswego Street [Member]</link:label>
    <link:label id="lab_fr_FiveFourOneZeroOswegoStreetMember_documentation_en-US" xlink:label="lab_fr_FiveFourOneZeroOswegoStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Four One Zero Oswego Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFourOneZeroOswegoStreetMember" xlink:href="fr-20251231.xsd#fr_FiveFourOneZeroOswegoStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFourOneZeroOswegoStreetMember" xlink:to="lab_fr_FiveFourOneZeroOswegoStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember_ab77e7f7-f8e2-404e-9075-c63522c56dd2_terseLabel_en-US" xlink:label="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2355 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Five Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three five five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeFiveFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeFiveFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_e843f13d-9891-4601-abf3-77c368f5da81_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember_terseLabel_en-US" xlink:label="lab_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year</link:label>
    <link:label id="lab_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember_label_en-US" xlink:label="lab_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:to="lab_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NumberOfStatesInWhichEntityOperates_d660d028-61af-4399-8fd9-0b987d1b5728_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfStatesInWhichEntityOperates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of states in which industrial properties are located</link:label>
    <link:label id="lab_us-gaap_NumberOfStatesInWhichEntityOperates_label_en-US" xlink:label="lab_us-gaap_NumberOfStatesInWhichEntityOperates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of States in which Entity Operates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfStatesInWhichEntityOperates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfStatesInWhichEntityOperates" xlink:to="lab_us-gaap_NumberOfStatesInWhichEntityOperates" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_17ede248-e2c7-48bd-b673-89684ef5ce6c_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fcc2041d-2564-497a-b779-6a68478bff29_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_9e35ec07-b664-440d-91ba-391ef7431cc4_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total for Company</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AOCI Attributable to Parent [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredChargesPolicyTextBlock_1160fa76-b1fb-43bf-9276-0427ec05b9fa_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredChargesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs</link:label>
    <link:label id="lab_us-gaap_DeferredChargesPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_DeferredChargesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Charges, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredChargesPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredChargesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredChargesPolicyTextBlock" xlink:to="lab_us-gaap_DeferredChargesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenSevenZeroGillsDriveMember_f0c1eebf-15f7-4c8c-93c2-a78445dc1b23_terseLabel_en-US" xlink:label="lab_fr_SevenSevenZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">770 Gills Drive [Member]</link:label>
    <link:label id="lab_fr_SevenSevenZeroGillsDriveMember_label_en-US" xlink:label="lab_fr_SevenSevenZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Seven Zero Gills Drive [Member]</link:label>
    <link:label id="lab_fr_SevenSevenZeroGillsDriveMember_documentation_en-US" xlink:label="lab_fr_SevenSevenZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Seven Zero Gills Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenSevenZeroGillsDriveMember" xlink:href="fr-20251231.xsd#fr_SevenSevenZeroGillsDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenSevenZeroGillsDriveMember" xlink:to="lab_fr_SevenSevenZeroGillsDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_bd5001f5-40df-4382-8f0b-3ef7a8f320fd_negatedLabel_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repurchase and Retirement of Restricted Stock/Awards</link:label>
    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_label_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:to="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroOneFiveMckenzieDriveMember_b0475d2e-d0f4-4fea-b077-aed5c694076f_terseLabel_en-US" xlink:label="lab_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015 McKenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroOneFiveMckenzieDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero One Five Mckenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroOneFiveMckenzieDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero one five mckenzie drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroOneFiveMckenzieDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:to="lab_fr_TwoZeroOneFiveMckenzieDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock_2fe4cf4b-c362-42e9-9120-e7c3fe17e06a_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Acquisition Purchase Price Allocation</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Real Estate Properties [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_OwnershipAxis_7e77ba73-6d4c-4b8d-a7c9-7beb16f0bf9b_terseLabel_en-US" xlink:label="lab_srt_OwnershipAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:label id="lab_srt_OwnershipAxis_label_en-US" xlink:label="lab_srt_OwnershipAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_OwnershipAxis" xlink:to="lab_srt_OwnershipAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_a444ef35-5cfb-4199-bf95-f1a4fdb50863_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments and Hedging Activities Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:to="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NumberofLandParcels_1132f96c-49e7-4018-bf15-6970ce48c141_terseLabel_en-US" xlink:label="lab_fr_NumberofLandParcels" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Land Parcels</link:label>
    <link:label id="lab_fr_NumberofLandParcels_label_en-US" xlink:label="lab_fr_NumberofLandParcels" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Land Parcels</link:label>
    <link:label id="lab_fr_NumberofLandParcels_documentation_en-US" xlink:label="lab_fr_NumberofLandParcels" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of Land Parcels</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NumberofLandParcels" xlink:href="fr-20251231.xsd#fr_NumberofLandParcels"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NumberofLandParcels" xlink:to="lab_fr_NumberofLandParcels" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_ea4b6f8e-d420-4735-92c0-263e8b6b650a_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Property [Domain]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Name of Property [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardGrantDateFairValue_terseLabel_en-US" xlink:label="lab_ecd_AwardGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value as of Grant Date</link:label>
    <link:label id="lab_ecd_AwardGrantDateFairValue_label_en-US" xlink:label="lab_ecd_AwardGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Grant Date Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardGrantDateFairValue" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardGrantDateFairValue" xlink:to="lab_ecd_AwardGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember_1cea7f25-fcef-456c-9e74-7f9296396907_terseLabel_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">200 Cascade Drive, Bldg. 1 [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember_label_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Zero Cascade Drive Bldg One [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember_documentation_en-US" xlink:label="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero zero Cascade Drive, Bldg. One.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:href="fr-20251231.xsd#fr_TwoZeroZeroCascadeDriveBldgOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:to="lab_fr_TwoZeroZeroCascadeDriveBldgOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PurchasePriceOfIndustrialProperties_c44f9530-a84c-4a08-b08a-ff2e7d9e0fe5_terseLabel_en-US" xlink:label="lab_fr_PurchasePriceOfIndustrialProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase Price of Industrial Properties Acquired</link:label>
    <link:label id="lab_fr_PurchasePriceOfIndustrialProperties_label_en-US" xlink:label="lab_fr_PurchasePriceOfIndustrialProperties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price of Industrial Properties</link:label>
    <link:label id="lab_fr_PurchasePriceOfIndustrialProperties_documentation_en-US" xlink:label="lab_fr_PurchasePriceOfIndustrialProperties" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase Price of Industrial Properties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PurchasePriceOfIndustrialProperties" xlink:href="fr-20251231.xsd#fr_PurchasePriceOfIndustrialProperties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PurchasePriceOfIndustrialProperties" xlink:to="lab_fr_PurchasePriceOfIndustrialProperties" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember_a2f61d3d-a118-4c24-9e55-e0c6b3d8494d_terseLabel_en-US" xlink:label="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4955 Oakley Industrial Blvd [Member]</link:label>
    <link:label id="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember_label_en-US" xlink:label="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Nine Five Five Oakley Industrial Blvd [Member]</link:label>
    <link:label id="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember_documentation_en-US" xlink:label="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Nine Five Five Oakley Industrial Blvd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:href="fr-20251231.xsd#fr_FourNineFiveFiveOakleyIndustrialBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:to="lab_fr_FourNineFiveFiveOakleyIndustrialBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_8b525f9c-0651-4448-aa5a-b18380eda606_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected volatility - weighted average</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_a916062d-7cc5-4d91-bb91-8e4c0f404a32_terseLabel_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Units/Performance Units and certain Performance RLP Units</link:label>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_label_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:to="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeZeroOneNCottonLaneMember_019c48af-9d03-7f94-8021-14a4110016f5_terseLabel_en-US" xlink:label="lab_fr_FiveThreeZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5301 N. Cotton Lane</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneNCottonLaneMember_label_en-US" xlink:label="lab_fr_FiveThreeZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Zero One N Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneNCottonLaneMember_documentation_en-US" xlink:label="lab_fr_FiveThreeZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Three Zero One N Cotton Lane</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeZeroOneNCottonLaneMember" xlink:href="fr-20251231.xsd#fr_FiveThreeZeroOneNCottonLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeZeroOneNCottonLaneMember" xlink:to="lab_fr_FiveThreeZeroOneNCottonLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3485e9ee-a3c4-4d3e-8ef5-98305c31ac89_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of Restricted Stock/Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_aebc75f7-22a5-4ef6-a494-559cd33a3cf0_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Issued, Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership_7987621b-b33e-4c29-adc9-fa0797561717_terseLabel_en-US" xlink:label="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Joint Venture Partnership Ownership</link:label>
    <link:label id="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership_label_en-US" xlink:label="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Joint Venture Partnership Ownership</link:label>
    <link:label id="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership_documentation_en-US" xlink:label="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Joint Venture Partnership Ownership</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:href="fr-20251231.xsd#fr_EquityMethodInvestmentJointVenturePartnershipOwnership"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:to="lab_fr_EquityMethodInvestmentJointVenturePartnershipOwnership" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_c79d8f69-483c-4115-a98e-f289c618954d_terseLabel_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title and Position [Domain]</link:label>
    <link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_label_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title and Position [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CostsAndExpenses_1aa1f31c-5269-44c0-820d-226febfe480a_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpenses_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostsAndExpenses" xlink:to="lab_us-gaap_CostsAndExpenses" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_75691304-c0b6-4c9e-8b14-8fff52386377_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Forfeited, Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_69f6cbf7-b179-43b8-87f0-2f54f4ff6131_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized compensation related to unvested Performance Awards</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_QualifiedDividendAsPercentageOfDistributions_4936f8f0-6c10-4129-b733-fd68109025f6_terseLabel_en-US" xlink:label="lab_fr_QualifiedDividendAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Qualified Dividend as a Percentage Of Distributions</link:label>
    <link:label id="lab_fr_QualifiedDividendAsPercentageOfDistributions_label_en-US" xlink:label="lab_fr_QualifiedDividendAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Qualified Dividend As Percentage Of Distributions</link:label>
    <link:label id="lab_fr_QualifiedDividendAsPercentageOfDistributions_documentation_en-US" xlink:label="lab_fr_QualifiedDividendAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Qualified Dividend As Percentage Of Distributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_QualifiedDividendAsPercentageOfDistributions" xlink:href="fr-20251231.xsd#fr_QualifiedDividendAsPercentageOfDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_QualifiedDividendAsPercentageOfDistributions" xlink:to="lab_fr_QualifiedDividendAsPercentageOfDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneOneParrBoulevardMember_92059220-5252-45f0-a8f1-dcf2e0396b31_terseLabel_en-US" xlink:label="lab_fr_TwoOneOneParrBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">211 Parr Boulevard</link:label>
    <link:label id="lab_fr_TwoOneOneParrBoulevardMember_label_en-US" xlink:label="lab_fr_TwoOneOneParrBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One One Parr Boulevard [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneParrBoulevardMember_documentation_en-US" xlink:label="lab_fr_TwoOneOneParrBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two One One Parr Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneOneParrBoulevardMember" xlink:href="fr-20251231.xsd#fr_TwoOneOneParrBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneOneParrBoulevardMember" xlink:to="lab_fr_TwoOneOneParrBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtFairValue_338c9dfe-699c-4de0-86f6-8b43fab282f0_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_LongTermDebtFairValue_label_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtFairValue" xlink:to="lab_us-gaap_LongTermDebtFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ChangedPeerGroupFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_ChangedPeerGroupFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changed Peer Group, Footnote</link:label>
    <link:label id="lab_ecd_ChangedPeerGroupFnTextBlock_label_en-US" xlink:label="lab_ecd_ChangedPeerGroupFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Changed Peer Group, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChangedPeerGroupFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ChangedPeerGroupFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ChangedPeerGroupFnTextBlock" xlink:to="lab_ecd_ChangedPeerGroupFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember_8ac208f0-3a3a-49bc-837b-6ddf15281ffd_terseLabel_en-US" xlink:label="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4720 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Two Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven two zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenTwoZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourSevenTwoZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFourZeroOneShaderRoadMember_c773ed45-983c-4e5a-be5a-9d0c94a2b0cd_terseLabel_en-US" xlink:label="lab_fr_FourFourZeroOneShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4401 Shader Road [Member]</link:label>
    <link:label id="lab_fr_FourFourZeroOneShaderRoadMember_label_en-US" xlink:label="lab_fr_FourFourZeroOneShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Four Zero One Shader Road [Member]</link:label>
    <link:label id="lab_fr_FourFourZeroOneShaderRoadMember_documentation_en-US" xlink:label="lab_fr_FourFourZeroOneShaderRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Four Zero One Shader Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFourZeroOneShaderRoadMember" xlink:href="fr-20251231.xsd#fr_FourFourZeroOneShaderRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFourZeroOneShaderRoadMember" xlink:to="lab_fr_FourFourZeroOneShaderRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_475a15b6-9ec9-4dea-b51d-2880749fd259_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AdjToPeoCompFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_AdjToPeoCompFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment To PEO Compensation, Footnote</link:label>
    <link:label id="lab_ecd_AdjToPeoCompFnTextBlock_label_en-US" xlink:label="lab_ecd_AdjToPeoCompFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustment To PEO Compensation, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToPeoCompFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AdjToPeoCompFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AdjToPeoCompFnTextBlock" xlink:to="lab_ecd_AdjToPeoCompFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_3b121c36-3c0e-48a1-8ca8-380db8da8c46_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements and Changes in Accounting Principles [Abstract]</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Standards Update and Change in Accounting Principle [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:to="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember_2dd26c01-914e-40c9-8257-ab9010880a36_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027 Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Twenty Seven Two Notes [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Twenty Seven Two Notes [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandTwentySevenTwoNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrIndTitle_terseLabel_en-US" xlink:label="lab_ecd_TrdArrIndTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title</link:label>
    <link:label id="lab_ecd_TrdArrIndTitle_label_en-US" xlink:label="lab_ecd_TrdArrIndTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement, Individual Title</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrIndTitle" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrIndTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrIndTitle" xlink:to="lab_ecd_TrdArrIndTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeerGroupTotalShareholderRtnAmt_terseLabel_en-US" xlink:label="lab_ecd_PeerGroupTotalShareholderRtnAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Peer Group Total Shareholder Return Amount</link:label>
    <link:label id="lab_ecd_PeerGroupTotalShareholderRtnAmt_label_en-US" xlink:label="lab_ecd_PeerGroupTotalShareholderRtnAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Peer Group Total Shareholder Return Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeerGroupTotalShareholderRtnAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeerGroupTotalShareholderRtnAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeerGroupTotalShareholderRtnAmt" xlink:to="lab_ecd_PeerGroupTotalShareholderRtnAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LandAcquisitionActivityMember_969012ef-744a-4344-9a2f-2b0177866af9_terseLabel_en-US" xlink:label="lab_fr_LandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land Acquisition Activity</link:label>
    <link:label id="lab_fr_LandAcquisitionActivityMember_label_en-US" xlink:label="lab_fr_LandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land Acquisition Activity [Member]</link:label>
    <link:label id="lab_fr_LandAcquisitionActivityMember_documentation_en-US" xlink:label="lab_fr_LandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Land Acquisition Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LandAcquisitionActivityMember" xlink:href="fr-20251231.xsd#fr_LandAcquisitionActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LandAcquisitionActivityMember" xlink:to="lab_fr_LandAcquisitionActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_CapitalGainasPercentageofDistributions_43ed6847-83d0-4430-8755-33c2947d5c93_terseLabel_en-US" xlink:label="lab_fr_CapitalGainasPercentageofDistributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital Gain as a Percentage of Distributions</link:label>
    <link:label id="lab_fr_CapitalGainasPercentageofDistributions_label_en-US" xlink:label="lab_fr_CapitalGainasPercentageofDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Gain as Percentage of Distributions</link:label>
    <link:label id="lab_fr_CapitalGainasPercentageofDistributions_documentation_en-US" xlink:label="lab_fr_CapitalGainasPercentageofDistributions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Gain as Percentage of Distributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_CapitalGainasPercentageofDistributions" xlink:href="fr-20251231.xsd#fr_CapitalGainasPercentageofDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_CapitalGainasPercentageofDistributions" xlink:to="lab_fr_CapitalGainasPercentageofDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding_706a04c9-63b5-4afc-981c-1d8a9931bc34_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General Partner Units, units outstanding</link:label>
    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding_label_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General Partners' Capital Account, Units Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding" xlink:to="lab_us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroOneHeinzWayMember_9393b366-63dd-434c-bb9e-74c03edf43cc_terseLabel_en-US" xlink:label="lab_fr_EightZeroOneHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">801 Heinz Way [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneHeinzWayMember_label_en-US" xlink:label="lab_fr_EightZeroOneHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero One Heinz Way [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneHeinzWayMember_documentation_en-US" xlink:label="lab_fr_EightZeroOneHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Zero One Heinz Way [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroOneHeinzWayMember" xlink:href="fr-20251231.xsd#fr_EightZeroOneHeinzWayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroOneHeinzWayMember" xlink:to="lab_fr_EightZeroOneHeinzWayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssets_82622ac0-6bb6-417f-b284-df17dee0fd8b_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid Expenses and Other Assets, Net</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssets_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense and Other Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssets" xlink:to="lab_us-gaap_PrepaidExpenseAndOtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonPeoNeoMember_terseLabel_en-US" xlink:label="lab_ecd_NonPeoNeoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-PEO NEO</link:label>
    <link:label id="lab_ecd_NonPeoNeoMember_label_en-US" xlink:label="lab_ecd_NonPeoNeoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-PEO NEO [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonPeoNeoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NonPeoNeoMember" xlink:to="lab_ecd_NonPeoNeoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_e9c37c1c-8da8-4471-adea-4c0167eb6ae6_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding amount of letters of credit and performance bonds in the aggregate</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureLandMember_019c457b-c11d-757e-b7f4-88a6092d44a7_terseLabel_en-US" xlink:label="lab_fr_JointVentureLandMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Land</link:label>
    <link:label id="lab_fr_JointVentureLandMember_label_en-US" xlink:label="lab_fr_JointVentureLandMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Land [Member]</link:label>
    <link:label id="lab_fr_JointVentureLandMember_documentation_en-US" xlink:label="lab_fr_JointVentureLandMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureLandMember" xlink:href="fr-20251231.xsd#fr_JointVentureLandMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureLandMember" xlink:to="lab_fr_JointVentureLandMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_4a1978c3-8a08-4e3b-bd3c-02ee0868ab52_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsidiarySaleOfStockAxis_a02da69a-bfdf-405a-99a4-c7b864a48a63_terseLabel_en-US" xlink:label="lab_us-gaap_SubsidiarySaleOfStockAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of Stock [Axis]</link:label>
    <link:label id="lab_us-gaap_SubsidiarySaleOfStockAxis_label_en-US" xlink:label="lab_us-gaap_SubsidiarySaleOfStockAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale of Stock [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis" xlink:to="lab_us-gaap_SubsidiarySaleOfStockAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d3834f5a-8309-41d9-86d2-41a9e87c9b25_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type [Domain]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
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    <link:label id="lab_fr_OneFourNineSixNineSummitDriveMember_fb83a3b4-d997-42dd-bbdb-54424a6bb021_terseLabel_en-US" xlink:label="lab_fr_OneFourNineSixNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14969 Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineSixNineSummitDriveMember_label_en-US" xlink:label="lab_fr_OneFourNineSixNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine Six Nine Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineSixNineSummitDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourNineSixNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine Six Nine Summit Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourNineSixNineSummitDriveMember" xlink:href="fr-20251231.xsd#fr_OneFourNineSixNineSummitDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourNineSixNineSummitDriveMember" xlink:to="lab_fr_OneFourNineSixNineSummitDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_47bb608a-bea0-48ee-afc8-87c8f0f01aae_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterest_592c3a28-45a4-402a-bd3c-8dc002ef42fa_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_MinorityInterest_label_en-US" xlink:label="lab_us-gaap_MinorityInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity, Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterest" xlink:to="lab_us-gaap_MinorityInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_EqtyAwrdsAdjsMember_terseLabel_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments</link:label>
    <link:label id="lab_ecd_EqtyAwrdsAdjsMember_label_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_EqtyAwrdsAdjsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_EqtyAwrdsAdjsMember" xlink:to="lab_ecd_EqtyAwrdsAdjsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightZeroOneNorthAndrewsMember_8cb65050-d16b-4473-ba03-a448cd73e82f_terseLabel_en-US" xlink:label="lab_fr_OneEightZeroOneNorthAndrewsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1801 North Andrews</link:label>
    <link:label id="lab_fr_OneEightZeroOneNorthAndrewsMember_label_en-US" xlink:label="lab_fr_OneEightZeroOneNorthAndrewsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight Zero One North Andrews [Member]</link:label>
    <link:label id="lab_fr_OneEightZeroOneNorthAndrewsMember_documentation_en-US" xlink:label="lab_fr_OneEightZeroOneNorthAndrewsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Eight Zero One North Andrews</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightZeroOneNorthAndrewsMember" xlink:href="fr-20251231.xsd#fr_OneEightZeroOneNorthAndrewsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightZeroOneNorthAndrewsMember" xlink:to="lab_fr_OneEightZeroOneNorthAndrewsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PnsnBnftsAdjFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_PnsnBnftsAdjFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension Benefits Adjustments, Footnote</link:label>
    <link:label id="lab_ecd_PnsnBnftsAdjFnTextBlock_label_en-US" xlink:label="lab_ecd_PnsnBnftsAdjFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension Benefits Adjustments, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnBnftsAdjFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PnsnBnftsAdjFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PnsnBnftsAdjFnTextBlock" xlink:to="lab_ecd_PnsnBnftsAdjFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_OutstandingRecoveryCompAmt_terseLabel_en-US" xlink:label="lab_ecd_OutstandingRecoveryCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Compensation Amount</link:label>
    <link:label id="lab_ecd_OutstandingRecoveryCompAmt_label_en-US" xlink:label="lab_ecd_OutstandingRecoveryCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Outstanding Recovery Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingRecoveryCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_OutstandingRecoveryCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_OutstandingRecoveryCompAmt" xlink:to="lab_ecd_OutstandingRecoveryCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_c0ef3fb1-1ff6-4f6d-97dc-cfd2b9ca982e_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred:</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineZeroSixSevenReyesAvenueMember_118c331f-8fb4-4812-99d7-00779a2a797b_terseLabel_en-US" xlink:label="lab_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">19067 Reyes Avenue [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroSixSevenReyesAvenueMember_label_en-US" xlink:label="lab_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Zero Six Seven Reyes Avenue [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroSixSevenReyesAvenueMember_documentation_en-US" xlink:label="lab_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine zero six seven Reyes Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:href="fr-20251231.xsd#fr_OneNineZeroSixSevenReyesAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:to="lab_fr_OneNineZeroSixSevenReyesAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_1379ef0c-4431-4785-82dc-048587c40170_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="lab_us-gaap_DebtInstrumentNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember_afa8b328-44d4-4c5d-8fdc-f43391fd3c6b_terseLabel_en-US" xlink:label="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7035 Winnetka Avene North [Member]</link:label>
    <link:label id="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember_label_en-US" xlink:label="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Zero Three Five Winnetka Avenue North [Member]</link:label>
    <link:label id="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember_documentation_en-US" xlink:label="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Zero Three Five Winnetka Avenue North [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:href="fr-20251231.xsd#fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:to="lab_fr_SevenZeroThreeFiveWinnetkaAvenueNorthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_DevelopmentActivityMember_4307916f-c56b-4355-86c4-13029cc8ec9c_terseLabel_en-US" xlink:label="lab_fr_DevelopmentActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Development Activity</link:label>
    <link:label id="lab_fr_DevelopmentActivityMember_label_en-US" xlink:label="lab_fr_DevelopmentActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Development Activity [Member]</link:label>
    <link:label id="lab_fr_DevelopmentActivityMember_documentation_en-US" xlink:label="lab_fr_DevelopmentActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Development Activity [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_DevelopmentActivityMember" xlink:href="fr-20251231.xsd#fr_DevelopmentActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_DevelopmentActivityMember" xlink:to="lab_fr_DevelopmentActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_e2200a63-5d30-449f-9143-52077181df77_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected dividend yield</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateDisclosureTextBlock_02510ac2-376c-40ac-922a-355c30eb13e4_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Real Estate</link:label>
    <link:label id="lab_us-gaap_RealEstateDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_RealEstateDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateDisclosureTextBlock" xlink:to="lab_us-gaap_RealEstateDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_RecoveryOfErrCompDisclosureLineItems_label_en-US" xlink:label="lab_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Recovery of Erroneously Awarded Compensation Disclosure [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_RecoveryOfErrCompDisclosureLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="lab_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_MnpiDiscTimedForCompValFlag_terseLabel_en-US" xlink:label="lab_ecd_MnpiDiscTimedForCompValFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">MNPI Disclosure Timed for Compensation Value</link:label>
    <link:label id="lab_ecd_MnpiDiscTimedForCompValFlag_label_en-US" xlink:label="lab_ecd_MnpiDiscTimedForCompValFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MNPI Disclosure Timed for Compensation Value [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MnpiDiscTimedForCompValFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_MnpiDiscTimedForCompValFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_MnpiDiscTimedForCompValFlag" xlink:to="lab_ecd_MnpiDiscTimedForCompValFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_945cceaa-a97a-4634-b670-c9b587fa9f7a_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Denominator:</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding Reconciliation [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember_a4fab149-bad1-4398-a499-6ee7d43e705f_terseLabel_en-US" xlink:label="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">225 Cross Farm Lane [Member]</link:label>
    <link:label id="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember_label_en-US" xlink:label="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Hundred And Twenty Five Cross Farm Lane [Member]</link:label>
    <link:label id="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember_documentation_en-US" xlink:label="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two hundred and twenty five cross farm lane.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:href="fr-20251231.xsd#fr_TwoHundredAndTwentyFiveCrossFarmLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:to="lab_fr_TwoHundredAndTwentyFiveCrossFarmLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenuesAbstract_f75eb1d9-5983-4422-ab24-e1a9d181ee92_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:label id="lab_us-gaap_RevenuesAbstract_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenuesAbstract" xlink:to="lab_us-gaap_RevenuesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentsIncorporatedByReferenceTextBlock_b36c941c-370a-46f2-b211-09adc069b57f_terseLabel_en-US" xlink:label="lab_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Documents Incorporated by Reference</link:label>
    <link:label id="lab_dei_DocumentsIncorporatedByReferenceTextBlock_label_en-US" xlink:label="lab_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Documents Incorporated by Reference [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:to="lab_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances_8c8ce437-1135-4241-b7d5-667c837e6fb9_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Encumbrances</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_19ba95e5-3437-4409-bfa6-6819d29b555d_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_0a2d38b2-0193-43ae-bbc7-19f26697bd9e_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilities_019c49b4-9552-7368-941a-5005bc86943c_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Total Deferred Income Tax Liabilities</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilities_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities" xlink:to="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_11bb9505-7d78-4934-bb11-fe9e897355e6_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PerformanceSharesMember_1e4cb858-5f97-4f3c-a4a4-9065c5a240dd_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Awards/Performance Units</link:label>
    <link:label id="lab_us-gaap_PerformanceSharesMember_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance Shares [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PerformanceSharesMember" xlink:to="lab_us-gaap_PerformanceSharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AggtPnsnAdjsSvcCstMember_terseLabel_en-US" xlink:label="lab_ecd_AggtPnsnAdjsSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Pension Adjustments Service Cost</link:label>
    <link:label id="lab_ecd_AggtPnsnAdjsSvcCstMember_label_en-US" xlink:label="lab_ecd_AggtPnsnAdjsSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Pension Adjustments Service Cost [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AggtPnsnAdjsSvcCstMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:to="lab_ecd_AggtPnsnAdjsSvcCstMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveZeroSouthFiveSixStreetMember_98024597-0ce0-42a3-a39c-9ccfebb1280b_terseLabel_en-US" xlink:label="lab_fr_FiveZeroSouthFiveSixStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">50 South 56th Street [Member]</link:label>
    <link:label id="lab_fr_FiveZeroSouthFiveSixStreetMember_label_en-US" xlink:label="lab_fr_FiveZeroSouthFiveSixStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Zero South Five Six Street [Member]</link:label>
    <link:label id="lab_fr_FiveZeroSouthFiveSixStreetMember_documentation_en-US" xlink:label="lab_fr_FiveZeroSouthFiveSixStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five zero south five six street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveZeroSouthFiveSixStreetMember" xlink:href="fr-20251231.xsd#fr_FiveZeroSouthFiveSixStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveZeroSouthFiveSixStreetMember" xlink:to="lab_fr_FiveZeroSouthFiveSixStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_04c29765-25be-4fc5-b100-e8fed2efca59_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember_ed347b86-73ae-4bd3-a9ed-f1689053c19d_terseLabel_en-US" xlink:label="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4701 Valley Industrial Blvd S [Member]</link:label>
    <link:label id="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember_label_en-US" xlink:label="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Zero One Valley Industrial Blvd S [Member]</link:label>
    <link:label id="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember_documentation_en-US" xlink:label="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven zero one Valley Industrial Blvd S.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:href="fr-20251231.xsd#fr_FourSevenZeroOneValleyIndustrialBlvdSMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:to="lab_fr_FourSevenZeroOneValleyIndustrialBlvdSMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3d9da8d9-074b-4a3e-87cc-4cdded98f9a8_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MinimumMember_40290813-3c3e-496f-9b31-5722d92686b6_terseLabel_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_srt_MinimumMember_label_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember" xlink:to="lab_srt_MinimumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoEightThreeFiveEastAnaStreetMember_7e1feafb-f837-4a90-9d5c-f50af6095e37_terseLabel_en-US" xlink:label="lab_fr_TwoEightThreeFiveEastAnaStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2835 East Ana Street [Member]</link:label>
    <link:label id="lab_fr_TwoEightThreeFiveEastAnaStreetMember_label_en-US" xlink:label="lab_fr_TwoEightThreeFiveEastAnaStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Eight Three Five East Ana Street [Member]</link:label>
    <link:label id="lab_fr_TwoEightThreeFiveEastAnaStreetMember_documentation_en-US" xlink:label="lab_fr_TwoEightThreeFiveEastAnaStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two eight three five east ana street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoEightThreeFiveEastAnaStreetMember" xlink:href="fr-20251231.xsd#fr_TwoEightThreeFiveEastAnaStreetMember"/>
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    <link:label id="lab_ecd_CoSelectedMeasureName_terseLabel_en-US" xlink:label="lab_ecd_CoSelectedMeasureName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Company Selected Measure Name</link:label>
    <link:label id="lab_ecd_CoSelectedMeasureName_label_en-US" xlink:label="lab_ecd_CoSelectedMeasureName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Company Selected Measure Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CoSelectedMeasureName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CoSelectedMeasureName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CoSelectedMeasureName" xlink:to="lab_ecd_CoSelectedMeasureName" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_150729f0-9914-464f-a64e-dfd3ef2aab18_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:to="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InvestmentinRealEstateActivityAxis_e9f28048-fdcb-4585-bfc2-3fb09a7e0aa4_terseLabel_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Real Estate Activity [Axis]</link:label>
    <link:label id="lab_fr_InvestmentinRealEstateActivityAxis_label_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment in Real Estate Activity [Axis]</link:label>
    <link:label id="lab_fr_InvestmentinRealEstateActivityAxis_documentation_en-US" xlink:label="lab_fr_InvestmentinRealEstateActivityAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment in Real Estate Activity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InvestmentinRealEstateActivityAxis" xlink:href="fr-20251231.xsd#fr_InvestmentinRealEstateActivityAxis"/>
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    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_def8e14b-5651-445c-a9fa-6d63c55d9cd9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Indebtedness</link:label>
    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureTextBlock" xlink:to="lab_us-gaap_DebtDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrSecuritiesAggAvailAmt_terseLabel_en-US" xlink:label="lab_ecd_TrdArrSecuritiesAggAvailAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Available</link:label>
    <link:label id="lab_ecd_TrdArrSecuritiesAggAvailAmt_label_en-US" xlink:label="lab_ecd_TrdArrSecuritiesAggAvailAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement, Securities Aggregate Available Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrSecuritiesAggAvailAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrSecuritiesAggAvailAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrSecuritiesAggAvailAmt" xlink:to="lab_ecd_TrdArrSecuritiesAggAvailAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest_488efdc6-a05f-4bd3-8c92-d7af034b1aa5_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General partners' minimum ownership interest in the Other Real Estate Partnerships</link:label>
    <link:label id="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest_label_en-US" xlink:label="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest"/>
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    <link:label id="lab_us-gaap_OperatingLeasePayments_e43c2bc6-d5c4-486b-80ed-2821fe729801_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash Paid for Operating Lease Liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeasePayments_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeasePayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments" xlink:to="lab_us-gaap_OperatingLeasePayments" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_terseLabel_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Appreciation Rights (SARs)</link:label>
    <link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_label_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Appreciation Rights (SARs) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockAppreciationRightsSARSMember" xlink:to="lab_us-gaap_StockAppreciationRightsSARSMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DividendsPayableCurrentAndNoncurrent_dd990eeb-ba82-47ed-b6d6-948f6d200988_terseLabel_en-US" xlink:label="lab_us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends and Distributions Payable</link:label>
    <link:label id="lab_us-gaap_DividendsPayableCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:to="lab_us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_0237d98e-fe08-4ad6-8067-25dc8fd77b2b_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note [Abstract]</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract" xlink:to="lab_us-gaap_StockholdersEquityNoteAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_89182ebf-1eb4-4654-8d03-40822807cfe9_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_ccec54c5-bde9-4bbf-96d5-c175817c638b_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourNineThreeNineSummitDriveMember_eae6dd83-4922-431c-841d-fee2638e6c4f_terseLabel_en-US" xlink:label="lab_fr_OneFourNineThreeNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14939 Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineThreeNineSummitDriveMember_label_en-US" xlink:label="lab_fr_OneFourNineThreeNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine Three Nine Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineThreeNineSummitDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourNineThreeNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine Three Nine Summit Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourNineThreeNineSummitDriveMember" xlink:href="fr-20251231.xsd#fr_OneFourNineThreeNineSummitDriveMember"/>
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    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_00eb252f-11ad-4baa-8f31-f00b57cd53c5_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting</link:label>
    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:to="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_3b2389c2-a06a-4768-93fb-6915d5a8994a_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Units converted to common stock</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_c9aba837-61ec-4e7d-8dce-8cdd5313d269_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion of Limited Partner Units</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Conversion of Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_NonGaapMeasureDescriptionTextBlock_terseLabel_en-US" xlink:label="lab_ecd_NonGaapMeasureDescriptionTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-GAAP Measure Description</link:label>
    <link:label id="lab_ecd_NonGaapMeasureDescriptionTextBlock_label_en-US" xlink:label="lab_ecd_NonGaapMeasureDescriptionTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-GAAP Measure Description [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonGaapMeasureDescriptionTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonGaapMeasureDescriptionTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_NonGaapMeasureDescriptionTextBlock" xlink:to="lab_ecd_NonGaapMeasureDescriptionTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourSixSixFiveNandinaAvenueMember_d50f569d-6815-48f5-a656-875985d1d3ca_terseLabel_en-US" xlink:label="lab_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24665 Nandina Avenue</link:label>
    <link:label id="lab_fr_TwoFourSixSixFiveNandinaAvenueMember_label_en-US" xlink:label="lab_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Six Six Five Nandina Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoFourSixSixFiveNandinaAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Six Six Five Nandina Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoFourSixSixFiveNandinaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:to="lab_fr_TwoFourSixSixFiveNandinaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeTable_400f9e70-56b2-45e1-9d67-122ec053fb1e_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:label id="lab_us-gaap_DerivativeTable_label_en-US" xlink:label="lab_us-gaap_DerivativeTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeTable" xlink:to="lab_us-gaap_DerivativeTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember_9c6d1b0d-d63d-4011-b694-5f46c5d52251_terseLabel_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9500 West 49th Street - C [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember_label_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street C [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember_documentation_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street C.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:href="fr-20251231.xsd#fr_NineFiveZeroZeroWestFourNinthStreetCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:to="lab_fr_NineFiveZeroZeroWestFourNinthStreetCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember_18fcdd19-fd5f-41bc-9595-3d448355ba9e_terseLabel_en-US" xlink:label="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9001 NW 87th Street</link:label>
    <link:label id="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember_label_en-US" xlink:label="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Zero Zero One NW Eighty Seventh Street [Member]</link:label>
    <link:label id="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember_documentation_en-US" xlink:label="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Zero Zero One NW Eighty Seventh Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:href="fr-20251231.xsd#fr_NineZeroZeroOneNWEightySeventhStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:to="lab_fr_NineZeroZeroOneNWEightySeventhStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember_019c4878-38c8-7ce6-bb5e-139159b592f5_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 Swaps II Due August 2027 and 2025 Swaps</link:label>
    <link:label id="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember_label_en-US" xlink:label="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swaps (2022 Swaps II and 2025 Swaps) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember_documentation_en-US" xlink:label="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swaps (2022 Swaps II and 2025 Swaps)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:href="fr-20251231.xsd#fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:to="lab_fr_InterestRateSwaps2022SwapsIIAnd2025SwapsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember_42487dbb-c25c-4c82-8d78-1099eaa45b28_terseLabel_en-US" xlink:label="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5055 Oakley Industrial Boulevard</link:label>
    <link:label id="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember_label_en-US" xlink:label="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Zero Five Five Oakley Industrial Boulevard [Member]</link:label>
    <link:label id="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember_documentation_en-US" xlink:label="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Zero Five Five Oakley Industrial Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:href="fr-20251231.xsd#fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:to="lab_fr_FiveZeroFiveFiveOakleyIndustrialBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntitySmallBusiness_ca07ae5d-db59-4900-80cf-fc2f1d657633_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Small Business</link:label>
    <link:label id="lab_dei_EntitySmallBusiness_label_en-US" xlink:label="lab_dei_EntitySmallBusiness" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Small Business</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitySmallBusiness" xlink:to="lab_dei_EntitySmallBusiness" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember_fdb97e3e-6f48-4074-a754-b5e13e2f8540_terseLabel_en-US" xlink:label="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4750 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Five Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven five zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenFiveZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourSevenFiveZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_b565583a-b9d7-4ef4-8b2c-48d3ab49fc2d_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Limited Partner Units, units outstanding</link:label>
    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_label_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account, Units Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:to="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineThreeFiveAldrinDriveMember_83841dfa-bc1f-46d0-9a64-12be45f22d3e_terseLabel_en-US" xlink:label="lab_fr_NineThreeFiveAldrinDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">935 Aldrin Drive [Member]</link:label>
    <link:label id="lab_fr_NineThreeFiveAldrinDriveMember_label_en-US" xlink:label="lab_fr_NineThreeFiveAldrinDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Three Five Aldrin Drive [Member]</link:label>
    <link:label id="lab_fr_NineThreeFiveAldrinDriveMember_documentation_en-US" xlink:label="lab_fr_NineThreeFiveAldrinDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">935 Aldrin Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineThreeFiveAldrinDriveMember" xlink:href="fr-20251231.xsd#fr_NineThreeFiveAldrinDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineThreeFiveAldrinDriveMember" xlink:to="lab_fr_NineThreeFiveAldrinDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_a3e5f94a-623f-4b02-a703-5c097ef99d57_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:to="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeFourEightFourColombardCourtMember_63bd002c-95bf-4141-8820-bbce6a4011f4_terseLabel_en-US" xlink:label="lab_fr_OneThreeFourEightFourColombardCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">13484 Colombard Court</link:label>
    <link:label id="lab_fr_OneThreeFourEightFourColombardCourtMember_label_en-US" xlink:label="lab_fr_OneThreeFourEightFourColombardCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Four Eight Four Colombard Court [Member]</link:label>
    <link:label id="lab_fr_OneThreeFourEightFourColombardCourtMember_documentation_en-US" xlink:label="lab_fr_OneThreeFourEightFourColombardCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Four Eight Four Colombard Court</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeFourEightFourColombardCourtMember" xlink:href="fr-20251231.xsd#fr_OneThreeFourEightFourColombardCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeFourEightFourColombardCourtMember" xlink:to="lab_fr_OneThreeFourEightFourColombardCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember_7305aa47-5d40-438a-b8a6-c2abea44e575_terseLabel_en-US" xlink:label="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2365 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Six Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three six five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeSixFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeSixFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember_7dcf1153-c82d-4269-946a-bcbd6fb43190_terseLabel_en-US" xlink:label="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1815-1957 South 4650 West [Member]</link:label>
    <link:label id="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember_label_en-US" xlink:label="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight One Five To One Nine Five Seven South Four Six Five Zero West [Member]</link:label>
    <link:label id="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember_documentation_en-US" xlink:label="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight one five to one nine five seven south four six five zero west.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:href="fr-20251231.xsd#fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:to="lab_fr_OneEightOneFiveToOneNineFiveSevenSouthFourSixFiveZeroWestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_08f3f69f-ad9b-464b-a6c2-2c62bb2f5e83_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">State</link:label>
    <link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_label_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current State and Local Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:to="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentTransitionReport_7a89164e-5873-4ca5-837b-23304ed42bfe_terseLabel_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Transition Report</link:label>
    <link:label id="lab_dei_DocumentTransitionReport_label_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Transition Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
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    <link:label id="lab_fr_FirstParkOneTwoOneBuildingFMember_documentation_en-US" xlink:label="lab_fr_FirstParkOneTwoOneBuildingFMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Park One Two One Building F</link:label>
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    <link:label id="lab_fr_OneFourNineFourZeroSummitDriveMember_a271402f-d0ac-4ec8-87f0-b9d5045bbc99_terseLabel_en-US" xlink:label="lab_fr_OneFourNineFourZeroSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14940 Summit Drive [Member]</link:label>
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    <link:label id="lab_fr_FourThreeFourThreeOscarNelsonJrDriveMember_2bfeb268-63f7-4091-9eb7-eaabbd33a150_terseLabel_en-US" xlink:label="lab_fr_FourThreeFourThreeOscarNelsonJrDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4343 Oscar Nelson Jr. Drive</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel3Member" xlink:to="lab_us-gaap_FairValueInputsLevel3Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_84dd5041-1c4d-4ef9-9998-edae203a973e_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings Per Share / Unit (EPS / EPU)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareTextBlock" xlink:to="lab_us-gaap_EarningsPerShareTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_OutstandingRecoveryIndName_terseLabel_en-US" xlink:label="lab_ecd_OutstandingRecoveryIndName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name</link:label>
    <link:label id="lab_ecd_OutstandingRecoveryIndName_label_en-US" xlink:label="lab_ecd_OutstandingRecoveryIndName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Outstanding Recovery, Individual Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingRecoveryIndName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_OutstandingRecoveryIndName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_OutstandingRecoveryIndName" xlink:to="lab_ecd_OutstandingRecoveryIndName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember_81321232-43c2-4335-9ca3-fb7e78f0678f_terseLabel_en-US" xlink:label="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4434 FM 1405</link:label>
    <link:label id="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember_label_en-US" xlink:label="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Four Three Four FM One Four Zero Five [Member]</link:label>
    <link:label id="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember_documentation_en-US" xlink:label="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Four Three Four FM One Four Zero Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:href="fr-20251231.xsd#fr_FourFourThreeFourFMOneFourZeroFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:to="lab_fr_FourFourThreeFourFMOneFourZeroFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdditionalPaidInCapital_e34074bf-8e8a-4713-a9bf-609cc6a88208_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapital_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid in Capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapital" xlink:to="lab_us-gaap_AdditionalPaidInCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember_f23ce4b0-a038-43f7-bceb-e13f96a9ec3a_terseLabel_en-US" xlink:label="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1701-1737 Flora Boulevard</link:label>
    <link:label id="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember_label_en-US" xlink:label="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Zero One through One Seven Three Seven Flora Boulevard [Member]</link:label>
    <link:label id="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember_documentation_en-US" xlink:label="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Seven Zero One through One Seven Three Seven Flora Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:href="fr-20251231.xsd#fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:to="lab_fr_OneSevenZeroOneThroughOneSevenThreeSevenFloraBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OrdinaryIncomeAsPercentageOfDistributions_ced90ef9-d44b-4ab7-846f-e80b4bee366f_terseLabel_en-US" xlink:label="lab_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ordinary Income as a Percentage of Distributions</link:label>
    <link:label id="lab_fr_OrdinaryIncomeAsPercentageOfDistributions_label_en-US" xlink:label="lab_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ordinary Income As Percentage Of Distributions</link:label>
    <link:label id="lab_fr_OrdinaryIncomeAsPercentageOfDistributions_documentation_en-US" xlink:label="lab_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ordinary Income as percentage of distributions.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:href="fr-20251231.xsd#fr_OrdinaryIncomeAsPercentageOfDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:to="lab_fr_OrdinaryIncomeAsPercentageOfDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeFiveZeroZeroChannahonRoadMember_5d94b395-b9a7-4adf-b07a-3622d11a3409_terseLabel_en-US" xlink:label="lab_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3500 Channahon Road [Member]</link:label>
    <link:label id="lab_fr_ThreeFiveZeroZeroChannahonRoadMember_label_en-US" xlink:label="lab_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Five Zero Zero Channahon Road [Member]</link:label>
    <link:label id="lab_fr_ThreeFiveZeroZeroChannahonRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Five Zero Zero Channahon Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:href="fr-20251231.xsd#fr_ThreeFiveZeroZeroChannahonRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:to="lab_fr_ThreeFiveZeroZeroChannahonRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1_a71bb6a7-b776-4d9e-bc3f-ead6a033d2f9_terseLabel_en-US" xlink:label="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-lived Intangible Assets Acquired</link:label>
    <link:label id="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1_9c3a46dc-483a-434f-95eb-5304d8ef0612_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Acquired finite lived intangible assets, fair value</link:label>
    <link:label id="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1_label_en-US" xlink:label="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets Acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:to="lab_us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeAxis_f9ba8c58-fa53-4d13-85c2-7f7e7f3937bd_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_label_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis" xlink:to="lab_srt_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember_d7486d89-5f86-4e55-98a1-36bf110b110a_terseLabel_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9500 West 49th Street - A [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember_label_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember_documentation_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:href="fr-20251231.xsd#fr_NineFiveZeroZeroWestFourNinthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:to="lab_fr_NineFiveZeroZeroWestFourNinthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseVariableLeaseIncome_53511ff9-8674-424c-a08f-5ba282f25018_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseVariableLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease, Variable Lease Income</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseVariableLeaseIncome_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseVariableLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Variable Lease Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseVariableLeaseIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseVariableLeaseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseVariableLeaseIncome" xlink:to="lab_us-gaap_OperatingLeaseVariableLeaseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember_47e58da5-0832-4f60-b05e-4a3ebc079044_terseLabel_en-US" xlink:label="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14518 Santa Ana Avenue [Member]</link:label>
    <link:label id="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember_label_en-US" xlink:label="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Five One Eight Santa Ana Avenue [Member]</link:label>
    <link:label id="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember_documentation_en-US" xlink:label="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Five One Eight Santa Ana Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:href="fr-20251231.xsd#fr_OneFourFiveOneEightSantaAnaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:to="lab_fr_OneFourFiveOneEightSantaAnaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember_78d4b1e1-84bb-4acf-81c3-177b37d7db7f_terseLabel_en-US" xlink:label="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3841 Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember_label_en-US" xlink:label="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Four One Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember_documentation_en-US" xlink:label="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Four One Ocean Ranch Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:href="fr-20251231.xsd#fr_ThreeEightFourOneOceanRanchBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:to="lab_fr_ThreeEightFourOneOceanRanchBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_4e0d8396-157d-4080-8805-2a36b8034f41_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Realized Gain (Loss) on Disposal</link:label>
    <link:label id="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Realized Gain (Loss) on Disposal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:to="lab_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveHundredEightySlawinCourtMember_3b477d47-38ea-4feb-b222-bd0d22fb1603_terseLabel_en-US" xlink:label="lab_fr_FiveHundredEightySlawinCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">580 Slawin Court [Member]</link:label>
    <link:label id="lab_fr_FiveHundredEightySlawinCourtMember_label_en-US" xlink:label="lab_fr_FiveHundredEightySlawinCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Hundred Eighty Slawin Court [Member]</link:label>
    <link:label id="lab_fr_FiveHundredEightySlawinCourtMember_documentation_en-US" xlink:label="lab_fr_FiveHundredEightySlawinCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five hundred eighty Slawin Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveHundredEightySlawinCourtMember" xlink:href="fr-20251231.xsd#fr_FiveHundredEightySlawinCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveHundredEightySlawinCourtMember" xlink:to="lab_fr_FiveHundredEightySlawinCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ProceedsFromUnsecuredTermLoans_eb710635-1f8b-4eaa-b96b-db0706ed387d_terseLabel_en-US" xlink:label="lab_fr_ProceedsFromUnsecuredTermLoans" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Unsecured Term Loans</link:label>
    <link:label id="lab_fr_ProceedsFromUnsecuredTermLoans_label_en-US" xlink:label="lab_fr_ProceedsFromUnsecuredTermLoans" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Unsecured Term Loans</link:label>
    <link:label id="lab_fr_ProceedsFromUnsecuredTermLoans_documentation_en-US" xlink:label="lab_fr_ProceedsFromUnsecuredTermLoans" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds from Unsecured Term Loans</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ProceedsFromUnsecuredTermLoans" xlink:href="fr-20251231.xsd#fr_ProceedsFromUnsecuredTermLoans"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ProceedsFromUnsecuredTermLoans" xlink:to="lab_fr_ProceedsFromUnsecuredTermLoans" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember_80a11714-260f-488b-a882-13d0c774adbc_terseLabel_en-US" xlink:label="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2610 &amp; 2660 Columbia [Member]</link:label>
    <link:label id="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember_label_en-US" xlink:label="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Six One Zero And Two Six Six Zero Columbia [Member]</link:label>
    <link:label id="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember_documentation_en-US" xlink:label="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two six one zero and two six six zero Columbia.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:href="fr-20251231.xsd#fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:to="lab_fr_TwoSixOneZeroAndTwoSixSixZeroColumbiaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember_2bbba7b0-e7ba-430f-a104-012d50d511df_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">302 Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember_label_en-US" xlink:label="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Two Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Zero Two Bordentown Hedding Road [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroTwoBordentownHeddingRoadMember" xlink:to="lab_fr_ThreeZeroTwoBordentownHeddingRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AggtErrCompAmt_terseLabel_en-US" xlink:label="lab_ecd_AggtErrCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Erroneous Compensation Amount</link:label>
    <link:label id="lab_ecd_AggtErrCompAmt_label_en-US" xlink:label="lab_ecd_AggtErrCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Erroneous Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtErrCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AggtErrCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AggtErrCompAmt" xlink:to="lab_ecd_AggtErrCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember_188855fc-6533-4888-a96b-c741a6d55131_terseLabel_en-US" xlink:label="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2777 Loker Avenue West [Member]</link:label>
    <link:label id="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember_label_en-US" xlink:label="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Seven Seven Loker Avenue West [Member]</link:label>
    <link:label id="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember_documentation_en-US" xlink:label="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Seven Seven Loker Avenue West [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:href="fr-20251231.xsd#fr_TwoSevenSevenSevenLokerAvenueWestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:to="lab_fr_TwoSevenSevenSevenLokerAvenueWestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_32985530-5276-45f3-982d-0a98d3f4c8f2_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Income Taxes Paid on Vested Equity Compensation</link:label>
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment, Tax Withholding, Share-Based Payment Arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember_2c20ec4e-da12-49d8-a0f4-9282428dc7bf_terseLabel_en-US" xlink:label="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1172-84 113th Street [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember_label_en-US" xlink:label="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Seven Two Eight Four One One Three Th Street D [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember_documentation_en-US" xlink:label="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Seven Two Eight Four One One Three th Street D.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:href="fr-20251231.xsd#fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:to="lab_fr_OneOneSevenTwoEightFourOneOneThreeThStreetDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroZeroNineMckenzieDriveMember_b382a8dc-c52f-4dbb-a462-b13aefafc665_terseLabel_en-US" xlink:label="lab_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2009 McKenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroNineMckenzieDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Zero Nine Mckenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroZeroNineMckenzieDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero zero nine mckenzie drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroZeroNineMckenzieDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:to="lab_fr_TwoZeroZeroNineMckenzieDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember_41303aec-b43f-4431-9324-7641725b160b_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030 II Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty II [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty II</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember_3e12c2b6-beb9-418b-9cc5-bb32525815c5_terseLabel_en-US" xlink:label="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1250 Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember_label_en-US" xlink:label="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Five Zero Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember_documentation_en-US" xlink:label="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One two five zero rancho Conejo Blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:href="fr-20251231.xsd#fr_OneTwoFiveZeroRanchoConejoBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:to="lab_fr_OneTwoFiveZeroRanchoConejoBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember_b36e5983-dc56-44b1-9b0b-80f33ec6f9a8_terseLabel_en-US" xlink:label="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7250-7260 Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember_label_en-US" xlink:label="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Two Five Zero To Seven Two Six Zero Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember_documentation_en-US" xlink:label="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7250-7260 Wynnwood.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:href="fr-20251231.xsd#fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:to="lab_fr_SevenTwoFiveZeroToSevenTwoSixZeroWynnwoodMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeerGroupIssuersFnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_PeerGroupIssuersFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Peer Group Issuers, Footnote</link:label>
    <link:label id="lab_ecd_PeerGroupIssuersFnTextBlock_label_en-US" xlink:label="lab_ecd_PeerGroupIssuersFnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Peer Group Issuers, Footnote [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeerGroupIssuersFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeerGroupIssuersFnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeerGroupIssuersFnTextBlock" xlink:to="lab_ecd_PeerGroupIssuersFnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroFiveSequoiaAvenueMember_bc79145b-a203-40f6-819b-bd032f9d79b3_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">305 Sequoia Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFiveSequoiaAvenueMember_label_en-US" xlink:label="lab_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Five Sequoia Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFiveSequoiaAvenueMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Zero Five Sequoia Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroFiveSequoiaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:to="lab_fr_ThreeZeroFiveSequoiaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_87074086-1ff0-46c6-9ed6-457fe6d6ba13_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders / Unitholders</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_da0779bb-1bfc-4642-b734-5d4c271af00b_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders / Unitholders</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInformationLineItems_bfc127c1-0098-4ad7-8a16-746b76b8e991_terseLabel_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:label id="lab_dei_EntityInformationLineItems_label_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInformationLineItems" xlink:to="lab_dei_EntityInformationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember_bdac6dbb-8dd3-4391-a7c9-dc039d1bf689_terseLabel_en-US" xlink:label="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4740 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Four Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven four zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenFourZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourSevenFourZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember_541302bb-2008-40ea-8ee9-5e0eb40c607b_terseLabel_en-US" xlink:label="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2375 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Seven Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three seven five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeSevenFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeSevenFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightFiveZeroFiveNLoopEastMember_f56537d1-c7bb-483e-ab1f-8f0f8b4bd476_terseLabel_en-US" xlink:label="lab_fr_EightFiveZeroFiveNLoopEastMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8505 N Loop East [Member]</link:label>
    <link:label id="lab_fr_EightFiveZeroFiveNLoopEastMember_label_en-US" xlink:label="lab_fr_EightFiveZeroFiveNLoopEastMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Five Zero Five N Loop East [Member]</link:label>
    <link:label id="lab_fr_EightFiveZeroFiveNLoopEastMember_documentation_en-US" xlink:label="lab_fr_EightFiveZeroFiveNLoopEastMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight five zero five N Loop East.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightFiveZeroFiveNLoopEastMember" xlink:href="fr-20251231.xsd#fr_EightFiveZeroFiveNLoopEastMember"/>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ea973ce6-f813-4796-9bf9-e8d33a848e84_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Current Period Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member_a1b9a5ac-37c7-4080-a518-68d264ec8836_terseLabel_en-US" xlink:label="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1281 Highway 155 S. [Member]</link:label>
    <link:label id="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member_label_en-US" xlink:label="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Eight One Highway One Five Five S. [Member]</link:label>
    <link:label id="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member_documentation_en-US" xlink:label="lab_fr_OneTwoEightOneHighwayOneFiveFiveS.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Eight One Highway One Five Five S. [Member]</link:label>
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    <link:label id="lab_fr_ThreeZeroOneFiveEastAnaMember_e81ee347-aa33-4efa-8bd6-00c3951a45fe_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroOneFiveEastAnaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3015 East Ana [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroOneFiveEastAnaMember_label_en-US" xlink:label="lab_fr_ThreeZeroOneFiveEastAnaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero One Five East Ana [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroOneFiveEastAnaMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroOneFiveEastAnaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three zero one five east ana.</link:label>
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    <link:label id="lab_fr_IncomeTaxLineItems_218fdb3d-c997-4614-b4b5-9ae0a31ca151_terseLabel_en-US" xlink:label="lab_fr_IncomeTaxLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax [Line Items]</link:label>
    <link:label id="lab_fr_IncomeTaxLineItems_label_en-US" xlink:label="lab_fr_IncomeTaxLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax [Line Items]</link:label>
    <link:label id="lab_fr_IncomeTaxLineItems_documentation_en-US" xlink:label="lab_fr_IncomeTaxLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income Tax [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncomeTaxLineItems" xlink:href="fr-20251231.xsd#fr_IncomeTaxLineItems"/>
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    <link:label id="lab_fr_ThirtyEightLovetonCircleMember_417432a3-12ca-4a37-a22f-9029867e95f9_terseLabel_en-US" xlink:label="lab_fr_ThirtyEightLovetonCircleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">38 Loveton Circle [Member]</link:label>
    <link:label id="lab_fr_ThirtyEightLovetonCircleMember_label_en-US" xlink:label="lab_fr_ThirtyEightLovetonCircleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Thirty Eight Loveton Circle [Member]</link:label>
    <link:label id="lab_fr_ThirtyEightLovetonCircleMember_documentation_en-US" xlink:label="lab_fr_ThirtyEightLovetonCircleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Thirty eight Loveton Circle.</link:label>
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    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_0ac94890-4234-4248-8d16-5a19a5d56d97_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Quoted Prices in Active Markets for Identical Assets (Level 1)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member" xlink:to="lab_us-gaap_FairValueInputsLevel1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCredit_98382146-2d0f-4eba-916b-e0f5d2b5b17d_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Credit Facility</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_label_en-US" xlink:label="lab_us-gaap_LineOfCredit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Line of Credit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
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    <link:label id="lab_fr_TwoZeroTwoOneWoodhavenRoadMember_8e524d22-5984-4ad3-a162-2d7932644811_terseLabel_en-US" xlink:label="lab_fr_TwoZeroTwoOneWoodhavenRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 Woodhaven Road</link:label>
    <link:label id="lab_fr_TwoZeroTwoOneWoodhavenRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroTwoOneWoodhavenRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Two One Woodhaven Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoOneWoodhavenRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroTwoOneWoodhavenRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Two One Woodhaven Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroTwoOneWoodhavenRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroTwoOneWoodhavenRoadMember"/>
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    <link:label id="lab_us-gaap_EarningsPerShareDiluted_455aa2b6-8aed-4440-afb2-bceb5bb15530_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders/Unitholders</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_31c0c950-e10e-460b-aec7-f6c1c6569c5e_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders/Unitholders</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
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    <link:label id="lab_fr_ThreeZeroHookMountainRoadMember_1b00a028-0821-45f4-b0c5-43f24520e1fe_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">30 Hook Mountain Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroHookMountainRoadMember_label_en-US" xlink:label="lab_fr_ThreeZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Hook Mountain Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroHookMountainRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three zero Hook Mountain Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroHookMountainRoadMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroHookMountainRoadMember"/>
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    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_2ca9b275-50b8-4f6c-acab-d45a9affe4fb_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSixZeroSixWestLudlowDriveMember_7ad30f14-6eac-48ce-80ee-1f41fc2bf21b_terseLabel_en-US" xlink:label="lab_fr_EightSixZeroSixWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8606 West Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSixZeroSixWestLudlowDriveMember_label_en-US" xlink:label="lab_fr_EightSixZeroSixWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Six Zero Six West Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSixZeroSixWestLudlowDriveMember_documentation_en-US" xlink:label="lab_fr_EightSixZeroSixWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Six Zero Six West Ludlow Drive [Member]</link:label>
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    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_da3284f5-5615-4e7b-803a-1b8ab623bbe3_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Axis]</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
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    <link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_d28f9ba8-9510-4b49-86fd-b93466c3b44b_totalLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Partners' Capital</link:label>
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    <link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:to="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFiveSevenZeroIvyStreetMember_ba4fb08b-eb44-446d-937a-3746ca82a1bf_terseLabel_en-US" xlink:label="lab_fr_FourFiveSevenZeroIvyStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4570 Ivy Street [Member]</link:label>
    <link:label id="lab_fr_FourFiveSevenZeroIvyStreetMember_label_en-US" xlink:label="lab_fr_FourFiveSevenZeroIvyStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Five Seven Zero Ivy Street [Member]</link:label>
    <link:label id="lab_fr_FourFiveSevenZeroIvyStreetMember_documentation_en-US" xlink:label="lab_fr_FourFiveSevenZeroIvyStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Five Seven Zero Ivy Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFiveSevenZeroIvyStreetMember" xlink:href="fr-20251231.xsd#fr_FourFiveSevenZeroIvyStreetMember"/>
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    <link:label id="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember_4d617844-b4f8-451a-bf06-e92e79b33a53_terseLabel_en-US" xlink:label="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">20 World's Fair Drive Lot 13 [Member]</link:label>
    <link:label id="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember_label_en-US" xlink:label="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Worlds Fair Drive Lot One Three [Member]</link:label>
    <link:label id="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember_documentation_en-US" xlink:label="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero Worlds Fair Drive Lot one three.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:href="fr-20251231.xsd#fr_TwoZeroWorldsFairDriveLotOneThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:to="lab_fr_TwoZeroWorldsFairDriveLotOneThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember_40c38107-27c5-45d4-b8ba-367339775f47_terseLabel_en-US" xlink:label="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">16522 Hunters Green Parkway [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember_label_en-US" xlink:label="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sixteen Thousand And Five Hundred And Twenty Two Hunters Green Parkway [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember_documentation_en-US" xlink:label="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sixteen thousand and five hundred and twenty two hunters green parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:href="fr-20251231.xsd#fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:to="lab_fr_SixteenThousandAndFiveHundredAndTwentyTwoHuntersGreenParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember_1fb135b0-1c97-41ed-9d17-08fbe50ef914_terseLabel_en-US" xlink:label="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1260 Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember_label_en-US" xlink:label="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Six Zero Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember_documentation_en-US" xlink:label="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One two six zero rancho Conejo Blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:href="fr-20251231.xsd#fr_OneTwoSixZeroRanchoConejoBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:to="lab_fr_OneTwoSixZeroRanchoConejoBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroLibertyIndustrialParkwayMember_63e56941-e6fd-4b69-b150-18651e2e1dcc_terseLabel_en-US" xlink:label="lab_fr_EightZeroLibertyIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">80 Liberty Industrial Parkway [Member]</link:label>
    <link:label id="lab_fr_EightZeroLibertyIndustrialParkwayMember_label_en-US" xlink:label="lab_fr_EightZeroLibertyIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero Liberty Industrial Parkway [Member]</link:label>
    <link:label id="lab_fr_EightZeroLibertyIndustrialParkwayMember_documentation_en-US" xlink:label="lab_fr_EightZeroLibertyIndustrialParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight zero liberty industrial parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroLibertyIndustrialParkwayMember" xlink:href="fr-20251231.xsd#fr_EightZeroLibertyIndustrialParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroLibertyIndustrialParkwayMember" xlink:to="lab_fr_EightZeroLibertyIndustrialParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019c45e3-2e7b-7767-b02f-118177e27c25_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Paid, State and Local, after Refund Received</link:label>
    <link:label id="lab_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Paid, State and Local, after Refund Received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived" xlink:to="lab_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationLineItems_193cd929-7b7a-477e-827a-44f5dd5bf7a2_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate and Accumulated Depreciation [Line Items]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationLineItems_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationLineItems" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorLocation_c06ff6b8-703d-4338-a15b-fdd14c8a0b2f_terseLabel_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Location</link:label>
    <link:label id="lab_dei_AuditorLocation_label_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Location</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLocation" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLocation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorLocation" xlink:to="lab_dei_AuditorLocation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureAcquisitionActivityMember_019c4499-326f-7794-8152-340dcf371d39_terseLabel_en-US" xlink:label="lab_fr_JointVentureAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Acquisition Activity</link:label>
    <link:label id="lab_fr_JointVentureAcquisitionActivityMember_label_en-US" xlink:label="lab_fr_JointVentureAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Acquisition Activity [Member]</link:label>
    <link:label id="lab_fr_JointVentureAcquisitionActivityMember_documentation_en-US" xlink:label="lab_fr_JointVentureAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Acquisition Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureAcquisitionActivityMember" xlink:href="fr-20251231.xsd#fr_JointVentureAcquisitionActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureAcquisitionActivityMember" xlink:to="lab_fr_JointVentureAcquisitionActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeSixFiveESlausonMember_dc58accc-d286-4bd5-9c1a-036409387dd9_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeSixFiveESlausonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3365 E. Slauson [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeSixFiveESlausonMember_label_en-US" xlink:label="lab_fr_ThreeThreeSixFiveESlausonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Six Five E Slauson [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeSixFiveESlausonMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeSixFiveESlausonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three three six five e Slauson.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeSixFiveESlausonMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeSixFiveESlausonMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeSixFiveESlausonMember" xlink:to="lab_fr_ThreeThreeSixFiveESlausonMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember_019c489f-eaf8-78d2-a515-16ac5cc4fd06_terseLabel_en-US" xlink:label="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2551 NW 19th Street</link:label>
    <link:label id="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember_label_en-US" xlink:label="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Five Five One NW Nineteenth Street [Member]</link:label>
    <link:label id="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember_documentation_en-US" xlink:label="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Five Five One NW Nineteenth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:href="fr-20251231.xsd#fr_TwoFiveFiveOneNWNineteenthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:to="lab_fr_TwoFiveFiveOneNWNineteenthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightOneFiveWWashingtonStreetMember_b84ab83e-cc29-4d06-89ab-7446be3a2e72_terseLabel_en-US" xlink:label="lab_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3815 W. Washington St. [Member]</link:label>
    <link:label id="lab_fr_ThreeEightOneFiveWWashingtonStreetMember_label_en-US" xlink:label="lab_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight One Five W Washington Street [Member]</link:label>
    <link:label id="lab_fr_ThreeEightOneFiveWWashingtonStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three eight one five W Washington Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeEightOneFiveWWashingtonStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:to="lab_fr_ThreeEightOneFiveWWashingtonStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroOneNineMckenzieDriveMember_c3e3dbd7-92d5-4c9e-9acd-19ea94a578d3_terseLabel_en-US" xlink:label="lab_fr_TwoZeroOneNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019 McKenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroOneNineMckenzieDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroOneNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero One Nine Mckenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroOneNineMckenzieDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroOneNineMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero one nine mckenzie drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroOneNineMckenzieDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroOneNineMckenzieDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroOneNineMckenzieDriveMember" xlink:to="lab_fr_TwoZeroOneNineMckenzieDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineFourAvenueandBuckeyeRoadMember_739e3542-cb6a-411d-b3bc-59cb8765f8fe_terseLabel_en-US" xlink:label="lab_fr_NineFourAvenueandBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">94th Avenue and Buckeye Road [Member]</link:label>
    <link:label id="lab_fr_NineFourAvenueandBuckeyeRoadMember_label_en-US" xlink:label="lab_fr_NineFourAvenueandBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Four Avenue and Buckeye Road [Member]</link:label>
    <link:label id="lab_fr_NineFourAvenueandBuckeyeRoadMember_documentation_en-US" xlink:label="lab_fr_NineFourAvenueandBuckeyeRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Four Avenue and Buckeye Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineFourAvenueandBuckeyeRoadMember" xlink:href="fr-20251231.xsd#fr_NineFourAvenueandBuckeyeRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineFourAvenueandBuckeyeRoadMember" xlink:to="lab_fr_NineFourAvenueandBuckeyeRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EconomicShareOfGainLossOnJointVentureSale_cf1a6163-5bfd-46f5-9cb9-f7b81b83557d_terseLabel_en-US" xlink:label="lab_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Economic Share of Gain (Loss) on Joint Venture Sale</link:label>
    <link:label id="lab_fr_EconomicShareOfGainLossOnJointVentureSale_label_en-US" xlink:label="lab_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Economic Share of Gain (Loss) on Joint Venture Sale</link:label>
    <link:label id="lab_fr_EconomicShareOfGainLossOnJointVentureSale_documentation_en-US" xlink:label="lab_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Economic Share of Gain (Loss) on Joint Venture Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:href="fr-20251231.xsd#fr_EconomicShareOfGainLossOnJointVentureSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:to="lab_fr_EconomicShareOfGainLossOnJointVentureSale" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstArlingtonCommerceCenterIIIMember_019c48b7-a5e4-78ba-a7ee-2ffc03c394f5_terseLabel_en-US" xlink:label="lab_fr_FirstArlingtonCommerceCenterIIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Arlington Commerce Center III</link:label>
    <link:label id="lab_fr_FirstArlingtonCommerceCenterIIIMember_label_en-US" xlink:label="lab_fr_FirstArlingtonCommerceCenterIIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Arlington Commerce Center III [Member]</link:label>
    <link:label id="lab_fr_FirstArlingtonCommerceCenterIIIMember_documentation_en-US" xlink:label="lab_fr_FirstArlingtonCommerceCenterIIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Arlington Commerce Center III</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FirstArlingtonCommerceCenterIIIMember" xlink:href="fr-20251231.xsd#fr_FirstArlingtonCommerceCenterIIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FirstArlingtonCommerceCenterIIIMember" xlink:to="lab_fr_FirstArlingtonCommerceCenterIIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5f43d77f-a66c-4e1b-9584-dd0339e17a5e_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LinesOfCreditFairValueDisclosure_6182fede-72c6-4d54-ab1c-0d7ba656f6e3_terseLabel_en-US" xlink:label="lab_us-gaap_LinesOfCreditFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Credit Facility</link:label>
    <link:label id="lab_us-gaap_LinesOfCreditFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_LinesOfCreditFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lines of Credit, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LinesOfCreditFairValueDisclosure" xlink:to="lab_us-gaap_LinesOfCreditFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember_96066309-8550-4f0b-abc6-0d7612bbf612_terseLabel_en-US" xlink:label="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5909-5915 N. Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember_label_en-US" xlink:label="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Thousand Nine Hundred Nine And Five Thousand Nine Hundred Fifteen Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember_documentation_en-US" xlink:label="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five thousand nine hundred nine and five thousand nine hundred fifteen N Broadway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:href="fr-20251231.xsd#fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:to="lab_fr_FiveThousandNineHundredNineAndFiveThousandNineHundredFifteenBroadwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember_c3627f32-638a-4965-a2c6-96dfdb7bdbf4_terseLabel_en-US" xlink:label="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8725 31st Street [Member]</link:label>
    <link:label id="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember_label_en-US" xlink:label="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Seven Two Five Thirty First Street [Member]</link:label>
    <link:label id="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember_documentation_en-US" xlink:label="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Seven Two Five Thirty First Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:href="fr-20251231.xsd#fr_EightSevenTwoFiveThirtyFirstStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:to="lab_fr_EightSevenTwoFiveThirtyFirstStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_548738e5-7f7b-4d37-acb9-874d1fb32914_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes Paid</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaidNet" xlink:to="lab_us-gaap_IncomeTaxesPaidNet" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroFiveOneE.MariaStreetMember_385f14f9-d42f-4309-a349-8301306a955b_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3051 E. Maria Street [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFiveOneE.MariaStreetMember_label_en-US" xlink:label="lab_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Five One E. Maria Street [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFiveOneE.MariaStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Zero Five One E. Maria Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroFiveOneE.MariaStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:to="lab_fr_ThreeZeroFiveOneE.MariaStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_4a904fba-6b5a-4e15-9ecb-b57630188f4f_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember_bc2dc1c0-54fb-4d1f-9bfc-ab2f71c82231_terseLabel_en-US" xlink:label="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">603 East Sam Houston Parkway S</link:label>
    <link:label id="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember_label_en-US" xlink:label="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Zero Three East Sam Houston Parkway S [Member]</link:label>
    <link:label id="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember_documentation_en-US" xlink:label="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Zero Three East Sam Houston Parkway S</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:href="fr-20251231.xsd#fr_SixZeroThreeEastSamHoustonParkwaySMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:to="lab_fr_SixZeroThreeEastSamHoustonParkwaySMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_44e8528d-dde6-439c-9058-40f9eb24ab78_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Gross</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_666cd49e-e3d2-4b62-bbe1-5fe0cb8ebe82_totalLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount" xlink:to="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_0bc9478b-3be1-4863-a7c8-d0b716ba5548_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_label_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityWellKnownSeasonedIssuer" xlink:to="lab_dei_EntityWellKnownSeasonedIssuer" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroFiveZeroEastParkDriveMember_b46bb11d-0e28-418d-a367-981be8255414_terseLabel_en-US" xlink:label="lab_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2050 East Park Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroFiveZeroEastParkDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Five Zero East Park Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroFiveZeroEastParkDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero five zero east park drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroFiveZeroEastParkDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:to="lab_fr_TwoZeroFiveZeroEastParkDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveOneZeroOneNCottonLaneMember_019c48ae-201b-7cb9-950e-7890526d6167_terseLabel_en-US" xlink:label="lab_fr_FiveOneZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5101 N. Cotton Lane</link:label>
    <link:label id="lab_fr_FiveOneZeroOneNCottonLaneMember_label_en-US" xlink:label="lab_fr_FiveOneZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five One Zero One N Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_FiveOneZeroOneNCottonLaneMember_documentation_en-US" xlink:label="lab_fr_FiveOneZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five One Zero One N Cotton Lane</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveOneZeroOneNCottonLaneMember" xlink:href="fr-20251231.xsd#fr_FiveOneZeroOneNCottonLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveOneZeroOneNCottonLaneMember" xlink:to="lab_fr_FiveOneZeroOneNCottonLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_407c9588-35f3-4839-beee-2a425d0614cf_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Lease Payments</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NetIncomeOfTheJointVentures_3511c8aa-a264-4e7b-a6be-5631c288ab99_terseLabel_en-US" xlink:label="lab_fr_NetIncomeOfTheJointVentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income of the Joint Ventures</link:label>
    <link:label id="lab_fr_NetIncomeOfTheJointVentures_label_en-US" xlink:label="lab_fr_NetIncomeOfTheJointVentures" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income of the Joint Ventures</link:label>
    <link:label id="lab_fr_NetIncomeOfTheJointVentures_documentation_en-US" xlink:label="lab_fr_NetIncomeOfTheJointVentures" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net Income of the Joint Ventures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NetIncomeOfTheJointVentures" xlink:href="fr-20251231.xsd#fr_NetIncomeOfTheJointVentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NetIncomeOfTheJointVentures" xlink:to="lab_fr_NetIncomeOfTheJointVentures" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember_f5d70ba7-10e2-4dd7-a850-a00fb455cf87_terseLabel_en-US" xlink:label="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4200 Business Center Drive [Member]</link:label>
    <link:label id="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember_label_en-US" xlink:label="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Two Zero Zero Business Center Drive [Member]</link:label>
    <link:label id="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember_documentation_en-US" xlink:label="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Two Zero Zero Business Center Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:href="fr-20251231.xsd#fr_FourTwoZeroZeroBusinessCenterDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:to="lab_fr_FourTwoZeroZeroBusinessCenterDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_23998954-9782-4afa-8523-3d3d96cafa85_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, current borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:to="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_f76963c3-df31-4eed-a965-e65d5690aa50_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Distributions to Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_label_en-US" xlink:label="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:to="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_VariableInterestEntitiesAbstract_b23be2a4-a648-4455-b7b9-8b9674527ee2_terseLabel_en-US" xlink:label="lab_fr_VariableInterestEntitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Abstract]</link:label>
    <link:label id="lab_fr_VariableInterestEntitiesAbstract_label_en-US" xlink:label="lab_fr_VariableInterestEntitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Abstract]</link:label>
    <link:label id="lab_fr_VariableInterestEntitiesAbstract_documentation_en-US" xlink:label="lab_fr_VariableInterestEntitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_VariableInterestEntitiesAbstract" xlink:href="fr-20251231.xsd#fr_VariableInterestEntitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_VariableInterestEntitiesAbstract" xlink:to="lab_fr_VariableInterestEntitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineEightZeroChicagoMember_6b5cba51-17b6-44cb-898d-4933c0f589f1_terseLabel_en-US" xlink:label="lab_fr_NineEightZeroChicagoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">980 Chicago [Member]</link:label>
    <link:label id="lab_fr_NineEightZeroChicagoMember_label_en-US" xlink:label="lab_fr_NineEightZeroChicagoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Eight Zero Chicago [Member]</link:label>
    <link:label id="lab_fr_NineEightZeroChicagoMember_documentation_en-US" xlink:label="lab_fr_NineEightZeroChicagoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine eight zero Chicago.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineEightZeroChicagoMember" xlink:href="fr-20251231.xsd#fr_NineEightZeroChicagoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineEightZeroChicagoMember" xlink:to="lab_fr_NineEightZeroChicagoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyManagementFeeRevenue_a8838857-fc9f-4b85-ae5b-20ed1b71c7c0_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyManagementFeeRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Management Fee</link:label>
    <link:label id="lab_us-gaap_PropertyManagementFeeRevenue_label_en-US" xlink:label="lab_us-gaap_PropertyManagementFeeRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Management Fee Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyManagementFeeRevenue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyManagementFeeRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyManagementFeeRevenue" xlink:to="lab_us-gaap_PropertyManagementFeeRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenSevenSevenOneNinetiethStreetMember_d3cca3d7-9e2b-495f-a5a7-51607b4ab5e4_terseLabel_en-US" xlink:label="lab_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">777 190th Street</link:label>
    <link:label id="lab_fr_SevenSevenSevenOneNinetiethStreetMember_label_en-US" xlink:label="lab_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Seven Seven One Ninetieth Street [Member]</link:label>
    <link:label id="lab_fr_SevenSevenSevenOneNinetiethStreetMember_documentation_en-US" xlink:label="lab_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Seven Seven One Ninetieth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:href="fr-20251231.xsd#fr_SevenSevenSevenOneNinetiethStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:to="lab_fr_SevenSevenSevenOneNinetiethStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember_a1b6ae7f-5347-4e5f-a908-87935e2ae0f0_terseLabel_en-US" xlink:label="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">19014 64th Avenue South [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember_label_en-US" xlink:label="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Zero One Four Six Four Avenue South [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember_documentation_en-US" xlink:label="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine zero one four six four avenue south.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:href="fr-20251231.xsd#fr_OneNineZeroOneFourSixFourAvenueSouthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:to="lab_fr_OneNineZeroOneFourSixFourAvenueSouthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrExpirationDate_terseLabel_en-US" xlink:label="lab_ecd_TrdArrExpirationDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expiration Date</link:label>
    <link:label id="lab_ecd_TrdArrExpirationDate_label_en-US" xlink:label="lab_ecd_TrdArrExpirationDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement Expiration Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrExpirationDate" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrExpirationDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrExpirationDate" xlink:to="lab_ecd_TrdArrExpirationDate" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightOneNineTurningBasinDrMember_ed25ef5e-64b7-410c-8346-3926fb735ccf_terseLabel_en-US" xlink:label="lab_fr_OneEightOneNineTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1819 Turning Basin Dr [Member]</link:label>
    <link:label id="lab_fr_OneEightOneNineTurningBasinDrMember_label_en-US" xlink:label="lab_fr_OneEightOneNineTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight One Nine Turning Basin Dr [Member]</link:label>
    <link:label id="lab_fr_OneEightOneNineTurningBasinDrMember_documentation_en-US" xlink:label="lab_fr_OneEightOneNineTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight one nine Turning Basin Dr.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightOneNineTurningBasinDrMember" xlink:href="fr-20251231.xsd#fr_OneEightOneNineTurningBasinDrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightOneNineTurningBasinDrMember" xlink:to="lab_fr_OneEightOneNineTurningBasinDrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherCommitmentsDomain_b61908c8-22c4-4b1a-bacf-a106243ef437_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Domain]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsDomain_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentsDomain" xlink:to="lab_us-gaap_OtherCommitmentsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciation_e0139c21-43f7-4656-b360-9dc486c6ecf2_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">(c) Accumulated Depreciation 12/31/2025</link:label>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciation_dd964a40-37a7-4131-a960-283c91cf9e49_periodStartLabel_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance, Beginning of Year</link:label>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciation_279d26f1-b88d-4ecc-81bb-d0846b97a4a5_periodEndLabel_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance, End of Year Including Real Estate Held for Sale</link:label>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciation_label_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAccumulatedDepreciation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAccumulatedDepreciation" xlink:to="lab_us-gaap_RealEstateAccumulatedDepreciation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2026InterestRateSwapsMember_019c4860-9dd1-7ced-abcb-4ee9a3e7fae0_terseLabel_en-US" xlink:label="lab_fr_A2026InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026 Swaps</link:label>
    <link:label id="lab_fr_A2026InterestRateSwapsMember_label_en-US" xlink:label="lab_fr_A2026InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2026 Interest Rate Swaps [Member]</link:label>
    <link:label id="lab_fr_A2026InterestRateSwapsMember_documentation_en-US" xlink:label="lab_fr_A2026InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2026 Interest Rate Swaps</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2026InterestRateSwapsMember" xlink:href="fr-20251231.xsd#fr_A2026InterestRateSwapsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2026InterestRateSwapsMember" xlink:to="lab_fr_A2026InterestRateSwapsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_0354f9e8-2fcf-49df-b618-ebc10a0778cf_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_930c0a42-8eed-4f96-b4db-2e2242cc7a09_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity/Partners' Capital:</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateCostOfRealEstateSold_adc45f89-4559-42e0-a2d0-8775067ecb0b_negatedLabel_en-US" xlink:label="lab_us-gaap_RealEstateCostOfRealEstateSold" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Disposition of Real Estate Assets</link:label>
    <link:label id="lab_us-gaap_RealEstateCostOfRealEstateSold_label_en-US" xlink:label="lab_us-gaap_RealEstateCostOfRealEstateSold" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateCostOfRealEstateSold" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateCostOfRealEstateSold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateCostOfRealEstateSold" xlink:to="lab_us-gaap_RealEstateCostOfRealEstateSold" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightOneSixOneOneOneStreetMember_9a8e67f4-7a67-414c-9242-a75bea728ac1_terseLabel_en-US" xlink:label="lab_fr_EightOneSixOneOneOneStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">816 111th Street [Member]</link:label>
    <link:label id="lab_fr_EightOneSixOneOneOneStreetMember_label_en-US" xlink:label="lab_fr_EightOneSixOneOneOneStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight One Six One One One Street [Member]</link:label>
    <link:label id="lab_fr_EightOneSixOneOneOneStreetMember_documentation_en-US" xlink:label="lab_fr_EightOneSixOneOneOneStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight one six one one one street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightOneSixOneOneOneStreetMember" xlink:href="fr-20251231.xsd#fr_EightOneSixOneOneOneStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightOneSixOneOneOneStreetMember" xlink:to="lab_fr_EightOneSixOneOneOneStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeZeroOneFloraBoulevardMember_10d1bfc4-7b65-49a0-931a-30f18b7baf55_terseLabel_en-US" xlink:label="lab_fr_OneThreeZeroOneFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1301 Flora Boulevard</link:label>
    <link:label id="lab_fr_OneThreeZeroOneFloraBoulevardMember_label_en-US" xlink:label="lab_fr_OneThreeZeroOneFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Zero One Flora Boulevard [Member]</link:label>
    <link:label id="lab_fr_OneThreeZeroOneFloraBoulevardMember_documentation_en-US" xlink:label="lab_fr_OneThreeZeroOneFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Zero One Flora Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeZeroOneFloraBoulevardMember" xlink:href="fr-20251231.xsd#fr_OneThreeZeroOneFloraBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeZeroOneFloraBoulevardMember" xlink:to="lab_fr_OneThreeZeroOneFloraBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_CompActuallyPaidVsNetIncomeTextBlock_terseLabel_en-US" xlink:label="lab_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Net Income</link:label>
    <link:label id="lab_ecd_CompActuallyPaidVsNetIncomeTextBlock_label_en-US" xlink:label="lab_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Net Income [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CompActuallyPaidVsNetIncomeTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:to="lab_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCurrentReportingStatus_183cfbbd-719e-487a-94f7-5352d0bbee5e_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:label id="lab_dei_EntityCurrentReportingStatus_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus" xlink:to="lab_dei_EntityCurrentReportingStatus" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeLineItems_5471ceb1-dc66-4ced-aa6a-bb7f619e1ca2_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativeLineItems_label_en-US" xlink:label="lab_us-gaap_DerivativeLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLineItems" xlink:to="lab_us-gaap_DerivativeLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardsCloseToMnpiDiscTable_terseLabel_en-US" xlink:label="lab_ecd_AwardsCloseToMnpiDiscTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Awards Close in Time to MNPI Disclosures</link:label>
    <link:label id="lab_ecd_AwardsCloseToMnpiDiscTable_label_en-US" xlink:label="lab_ecd_AwardsCloseToMnpiDiscTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Awards Close in Time to MNPI Disclosures [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardsCloseToMnpiDiscTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:to="lab_ecd_AwardsCloseToMnpiDiscTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateHeldforsale_bab02520-f52c-4f30-a93d-8ed2fef85542_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateHeldforsale" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate, Held-for-Sale</link:label>
    <link:label id="lab_us-gaap_RealEstateHeldforsale_label_en-US" xlink:label="lab_us-gaap_RealEstateHeldforsale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate, Held-for-Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateHeldforsale" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateHeldforsale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateHeldforsale" xlink:to="lab_us-gaap_RealEstateHeldforsale" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember_b74d2d9a-cd19-456e-9371-f7694b563037_terseLabel_en-US" xlink:label="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24200 Clawiter Road</link:label>
    <link:label id="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember_label_en-US" xlink:label="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Two Zero Zero Clawiter Road [Member]</link:label>
    <link:label id="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember_documentation_en-US" xlink:label="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Two Zero Zero Clawiter Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:href="fr-20251231.xsd#fr_TwoFourTwoZeroZeroClawiterRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:to="lab_fr_TwoFourTwoZeroZeroClawiterRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember_87102f40-7ea2-4ace-ac19-203cd40e3521_terseLabel_en-US" xlink:label="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1200-16 Avenue H [Member]</link:label>
    <link:label id="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember_label_en-US" xlink:label="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Zero Zero One Six Avenue H D [Member]</link:label>
    <link:label id="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember_documentation_en-US" xlink:label="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Zero Zero One Six Avenue H D [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:href="fr-20251231.xsd#fr_OneTwoZeroZeroOneSixAvenueHDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:to="lab_fr_OneTwoZeroZeroOneSixAvenueHDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PropertyExpensesPolicyTextBlock_6b90b6cd-a904-45be-920e-f18c29448d7b_terseLabel_en-US" xlink:label="lab_fr_PropertyExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Expenses</link:label>
    <link:label id="lab_fr_PropertyExpensesPolicyTextBlock_label_en-US" xlink:label="lab_fr_PropertyExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Expenses [Policy Text Block]</link:label>
    <link:label id="lab_fr_PropertyExpensesPolicyTextBlock_documentation_en-US" xlink:label="lab_fr_PropertyExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Property Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PropertyExpensesPolicyTextBlock" xlink:href="fr-20251231.xsd#fr_PropertyExpensesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PropertyExpensesPolicyTextBlock" xlink:to="lab_fr_PropertyExpensesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LeasesTermsMaximum_1af827e1-928c-45df-aea3-b69eb84b7f9c_terseLabel_en-US" xlink:label="lab_fr_LeasesTermsMaximum" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining Ground Lease Terms, Maximum</link:label>
    <link:label id="lab_fr_LeasesTermsMaximum_label_en-US" xlink:label="lab_fr_LeasesTermsMaximum" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases Terms Maximum</link:label>
    <link:label id="lab_fr_LeasesTermsMaximum_documentation_en-US" xlink:label="lab_fr_LeasesTermsMaximum" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leases Terms Maximum</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LeasesTermsMaximum" xlink:href="fr-20251231.xsd#fr_LeasesTermsMaximum"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LeasesTermsMaximum" xlink:to="lab_fr_LeasesTermsMaximum" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_76aa368c-727b-46a4-a3de-ad26177c7a99_terseLabel_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ExecutiveCategoryAxis_terseLabel_en-US" xlink:label="lab_ecd_ExecutiveCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Executive Category:</link:label>
    <link:label id="lab_ecd_ExecutiveCategoryAxis_label_en-US" xlink:label="lab_ecd_ExecutiveCategoryAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Executive Category [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ExecutiveCategoryAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ExecutiveCategoryAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ExecutiveCategoryAxis" xlink:to="lab_ecd_ExecutiveCategoryAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember_892ad362-8212-4d56-8ccf-9be338c0f279_terseLabel_en-US" xlink:label="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2401-2419 Walnut Ridge [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember_label_en-US" xlink:label="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Zero One To Two Four One Nine Walnut Ridge [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember_documentation_en-US" xlink:label="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two four zero one to two four one nine walnut ridge.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:href="fr-20251231.xsd#fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:to="lab_fr_TwoFourZeroOneToTwoFourOneNineWalnutRidgeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFiveZeroGillsDriveMember_0505cea6-748e-4600-bca0-1c5eb7c8ec2b_terseLabel_en-US" xlink:label="lab_fr_FiveFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">550 Gills Drive [Member]</link:label>
    <link:label id="lab_fr_FiveFiveZeroGillsDriveMember_label_en-US" xlink:label="lab_fr_FiveFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Five Zero Gills Drive [Member]</link:label>
    <link:label id="lab_fr_FiveFiveZeroGillsDriveMember_documentation_en-US" xlink:label="lab_fr_FiveFiveZeroGillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Five Zero Gills Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFiveZeroGillsDriveMember" xlink:href="fr-20251231.xsd#fr_FiveFiveZeroGillsDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFiveZeroGillsDriveMember" xlink:to="lab_fr_FiveFiveZeroGillsDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenEightFiveElatiMember_fa1b1d6e-98b1-4ec6-aee0-b446a754ba56_terseLabel_en-US" xlink:label="lab_fr_FourSevenEightFiveElatiMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4785 Elati Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenEightFiveElatiMember_label_en-US" xlink:label="lab_fr_FourSevenEightFiveElatiMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Eight Five Elati [Member]</link:label>
    <link:label id="lab_fr_FourSevenEightFiveElatiMember_documentation_en-US" xlink:label="lab_fr_FourSevenEightFiveElatiMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Seven Eight Five Elati.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenEightFiveElatiMember" xlink:href="fr-20251231.xsd#fr_FourSevenEightFiveElatiMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenEightFiveElatiMember" xlink:to="lab_fr_FourSevenEightFiveElatiMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_faecd781-5a73-4d45-95d1-8aa318c5d105_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:to="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourMcfaddenRoadMember_ee7bafff-66b4-45c9-80ab-6ad21ff33f4e_terseLabel_en-US" xlink:label="lab_fr_OneFourMcfaddenRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14 McFadden Road [Member]</link:label>
    <link:label id="lab_fr_OneFourMcfaddenRoadMember_label_en-US" xlink:label="lab_fr_OneFourMcfaddenRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Mcfadden Road [Member]</link:label>
    <link:label id="lab_fr_OneFourMcfaddenRoadMember_documentation_en-US" xlink:label="lab_fr_OneFourMcfaddenRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One four McFadden Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourMcfaddenRoadMember" xlink:href="fr-20251231.xsd#fr_OneFourMcfaddenRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourMcfaddenRoadMember" xlink:to="lab_fr_OneFourMcfaddenRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestExpense_735da8a7-2392-4e8b-933e-13005c5a5987_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Expense - Amortization of IRPAs</link:label>
    <link:label id="lab_us-gaap_InterestExpense_label_en-US" xlink:label="lab_us-gaap_InterestExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Operating and Nonoperating</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpense" xlink:to="lab_us-gaap_InterestExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_5b56b1eb-9d43-46de-a890-b47613f404b7_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Partnership's minimum ownership interest in the Other Real Estate Partnerships</link:label>
    <link:label id="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_label_en-US" xlink:label="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:to="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_7e208c11-e115-4d1a-8661-09d5f189d4aa_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate" xlink:to="lab_dei_CurrentFiscalYearEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourHundredOneAirportRoadMember_5f73315e-7ec4-461d-8b77-b590a06cbea4_terseLabel_en-US" xlink:label="lab_fr_FourHundredOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">401 Airport Road [Member]</link:label>
    <link:label id="lab_fr_FourHundredOneAirportRoadMember_label_en-US" xlink:label="lab_fr_FourHundredOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Hundred One Airport Road [Member]</link:label>
    <link:label id="lab_fr_FourHundredOneAirportRoadMember_documentation_en-US" xlink:label="lab_fr_FourHundredOneAirportRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Hundred One Airport Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourHundredOneAirportRoadMember" xlink:href="fr-20251231.xsd#fr_FourHundredOneAirportRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourHundredOneAirportRoadMember" xlink:to="lab_fr_FourHundredOneAirportRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_de441fdc-7454-423e-a294-becd4450208f_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LimitedPartnersCapitalAccountUnitsRetired_80e00b6b-f880-4c35-876c-a34ecef04e8b_terseLabel_en-US" xlink:label="lab_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account, Units Retired</link:label>
    <link:label id="lab_fr_LimitedPartnersCapitalAccountUnitsRetired_label_en-US" xlink:label="lab_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account, Units Retired</link:label>
    <link:label id="lab_fr_LimitedPartnersCapitalAccountUnitsRetired_documentation_en-US" xlink:label="lab_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account, Units Retired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:href="fr-20251231.xsd#fr_LimitedPartnersCapitalAccountUnitsRetired"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:to="lab_fr_LimitedPartnersCapitalAccountUnitsRetired" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember_42328af0-830a-4ec7-b727-038508599e70_terseLabel_en-US" xlink:label="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10100 58th Place [Member]</link:label>
    <link:label id="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember_label_en-US" xlink:label="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ten Thousand One Hundred Fifty Eight Th Place [Member]</link:label>
    <link:label id="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember_documentation_en-US" xlink:label="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ten Thousand One Hundred Fifty Eight Th Place [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:href="fr-20251231.xsd#fr_TenThousandOneHundredFiftyEightThPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:to="lab_fr_TenThousandOneHundredFiftyEightThPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e8dc523f-44c7-4c29-bbe2-64e5c341131f_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares available under the Stock Incentive Plan</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeFiveZeroOdessaWayMember_9c20ecab-07f1-4352-acef-42d4cef89a81_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3350 Odessa Way</link:label>
    <link:label id="lab_fr_ThreeThreeFiveZeroOdessaWayMember_label_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Five Zero Odessa Way [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeFiveZeroOdessaWayMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Three Five Zero Odessa Way</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeFiveZeroOdessaWayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:to="lab_fr_ThreeThreeFiveZeroOdessaWayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits_7de377fa-13ee-4fe0-92f2-8af42f896c06_terseLabel_en-US" xlink:label="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Partnership, aggregate cash payment</link:label>
    <link:label id="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits_label_en-US" xlink:label="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment in Cash for Redemption of Operating Partnership Units</link:label>
    <link:label id="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits_documentation_en-US" xlink:label="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment in Cash for Redemption of Operating Partnership Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:href="fr-20251231.xsd#fr_PaymentinCashforRedemptionofOperatingPartnershipUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:to="lab_fr_PaymentinCashforRedemptionofOperatingPartnershipUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfRealEstatePropertiesTable_278b18bf-91d6-4b02-9147-f20f43192135_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Property, Ownership [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRealEstatePropertiesTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Property, Ownership [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRealEstatePropertiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="lab_us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock_dad04d53-1f59-4c73-8e41-4c8a3f1f5a4b_terseLabel_en-US" xlink:label="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Industrial Property Dispositions</link:label>
    <link:label id="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock_label_en-US" xlink:label="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Dispositions of Industrial Properties [Table Text Block]</link:label>
    <link:label id="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock_documentation_en-US" xlink:label="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of Dispositions of Industrial Properties [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:href="fr-20251231.xsd#fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:to="lab_fr_ScheduleofDispositionsofIndustrialPropertiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember_8f95f3c3-047c-4959-8e20-7041b4562202_terseLabel_en-US" xlink:label="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8835 W. 116th Circle [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember_label_en-US" xlink:label="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Thousand Eight Hundred Thirty Five W One Hundred Sixteen Th Street [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember_documentation_en-US" xlink:label="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight thousand eight hundred thirty five W one hundred sixteen th Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:href="fr-20251231.xsd#fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:to="lab_fr_EightThousandEightHundredThirtyFiveWOneHundredSixteenThStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_98977517-6573-4617-aa32-0e05d9849489_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Domain]</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:to="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember_terseLabel_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments, Excluding Value Reported in Compensation Table</link:label>
    <link:label id="lab_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember_label_en-US" xlink:label="lab_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="lab_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneOneElleryCourtMember_7ee6496f-2152-4e8d-be91-e7cd2cc16e0e_terseLabel_en-US" xlink:label="lab_fr_TwoOneOneElleryCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">211 Ellery Court [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneElleryCourtMember_label_en-US" xlink:label="lab_fr_TwoOneOneElleryCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One One Ellery Court [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneElleryCourtMember_documentation_en-US" xlink:label="lab_fr_TwoOneOneElleryCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two one one Ellery Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneOneElleryCourtMember" xlink:href="fr-20251231.xsd#fr_TwoOneOneElleryCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneOneElleryCourtMember" xlink:to="lab_fr_TwoOneOneElleryCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineThreeOneAirLaneDriveMember_c1b05223-bd18-4b23-beea-a8eed4e4f88a_terseLabel_en-US" xlink:label="lab_fr_OneNineThreeOneAirLaneDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1931 Air Lane Drive [Member]</link:label>
    <link:label id="lab_fr_OneNineThreeOneAirLaneDriveMember_label_en-US" xlink:label="lab_fr_OneNineThreeOneAirLaneDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Three One Air Lane Drive [Member]</link:label>
    <link:label id="lab_fr_OneNineThreeOneAirLaneDriveMember_documentation_en-US" xlink:label="lab_fr_OneNineThreeOneAirLaneDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine three one Air Lane Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineThreeOneAirLaneDriveMember" xlink:href="fr-20251231.xsd#fr_OneNineThreeOneAirLaneDriveMember"/>
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    <link:label id="lab_fr_RetirementOfLimitedPartnerUnits_d3bce283-b622-4444-a3ff-30cd63a5003b_terseLabel_en-US" xlink:label="lab_fr_RetirementOfLimitedPartnerUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retirement of Limited Partner Units</link:label>
    <link:label id="lab_fr_RetirementOfLimitedPartnerUnits_label_en-US" xlink:label="lab_fr_RetirementOfLimitedPartnerUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retirement of Limited Partner Units</link:label>
    <link:label id="lab_fr_RetirementOfLimitedPartnerUnits_documentation_en-US" xlink:label="lab_fr_RetirementOfLimitedPartnerUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Retirement of Limited Partner Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_RetirementOfLimitedPartnerUnits" xlink:href="fr-20251231.xsd#fr_RetirementOfLimitedPartnerUnits"/>
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    <link:label id="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale_0f0be7eb-64b7-4a6a-9beb-8146193b318e_negatedTerseLabel_en-US" xlink:label="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Held for Sale</link:label>
    <link:label id="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale_label_en-US" xlink:label="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule III Accumulated Depreciation of Assets Held for Sale</link:label>
    <link:label id="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale_documentation_en-US" xlink:label="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule III Accumulated Depreciation of Assets Held-for-Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:href="fr-20251231.xsd#fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:to="lab_fr_ScheduleIIIAccumulatedDepreciationOfAssetsHeldForSale" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions_7838a137-1560-4471-bf94-0b6a6309af1f_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Distributions from the Joint Venture</link:label>
    <link:label id="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Equity Method Investment, Distribution</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:to="lab_us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_9a6809f0-1ca0-4b75-b4f8-2a041e375f95_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements on Recurring Basis</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_010c44b8-0232-49d2-a8a5-cc0c58c132d4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_label_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6cc13f35-7a78-45ee-aa0b-b1c580813801_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
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    <link:label id="lab_us-gaap_OtherCommitmentsTable_6cbd937c-3a56-4270-9544-4c0255b18337_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Table]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsTable_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentsTable" xlink:to="lab_us-gaap_OtherCommitmentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_62024612-fb8e-49e2-9247-60a952e57a0c_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_MeasureAxis_terseLabel_en-US" xlink:label="lab_ecd_MeasureAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measure:</link:label>
    <link:label id="lab_ecd_MeasureAxis_label_en-US" xlink:label="lab_ecd_MeasureAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measure [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MeasureAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_MeasureAxis"/>
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    <link:label id="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_901e75f0-7c73-4e61-bee7-e2fa7a4c60d6_verboseLabel_en-US" xlink:label="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Property Expenses</link:label>
    <link:label id="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_label_en-US" xlink:label="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Direct Costs of Leased and Rented Property or Equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:to="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenNineSixSevenBlankenshipMember_22ced78f-15fe-41cd-b65c-4d46230ff935_terseLabel_en-US" xlink:label="lab_fr_SevenNineSixSevenBlankenshipMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7967 Blankenship [Member]</link:label>
    <link:label id="lab_fr_SevenNineSixSevenBlankenshipMember_label_en-US" xlink:label="lab_fr_SevenNineSixSevenBlankenshipMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Nine Six Seven Blankenship [Member]</link:label>
    <link:label id="lab_fr_SevenNineSixSevenBlankenshipMember_documentation_en-US" xlink:label="lab_fr_SevenNineSixSevenBlankenshipMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7967 Blankenship.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenNineSixSevenBlankenshipMember" xlink:href="fr-20251231.xsd#fr_SevenNineSixSevenBlankenshipMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenNineSixSevenBlankenshipMember" xlink:to="lab_fr_SevenNineSixSevenBlankenshipMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember_54c4f98a-bf61-40ac-8004-189c50c5011a_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028 Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PrivatePlacementNotesDueTwoThousandTwentyEight [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PrivatePlacementNotesDueTwoThousandTwentyEight [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyEightMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineZeroOneMidwayRoadMember_37b2fdc0-92c9-43db-bfbe-bcd0fe9bd953_terseLabel_en-US" xlink:label="lab_fr_OneNineZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1901 Midway Road</link:label>
    <link:label id="lab_fr_OneNineZeroOneMidwayRoadMember_label_en-US" xlink:label="lab_fr_OneNineZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Zero One Midway Road [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroOneMidwayRoadMember_documentation_en-US" xlink:label="lab_fr_OneNineZeroOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Nine Zero One Midway Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineZeroOneMidwayRoadMember" xlink:href="fr-20251231.xsd#fr_OneNineZeroOneMidwayRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineZeroOneMidwayRoadMember" xlink:to="lab_fr_OneNineZeroOneMidwayRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2026UnsecuredTermLoanIIMember_019c4918-3346-79a9-a560-689d98ead150_terseLabel_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan II</link:label>
    <link:label id="lab_fr_A2026UnsecuredTermLoanIIMember_label_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan II [Member]</link:label>
    <link:label id="lab_fr_A2026UnsecuredTermLoanIIMember_documentation_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan II</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2026UnsecuredTermLoanIIMember" xlink:href="fr-20251231.xsd#fr_A2026UnsecuredTermLoanIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2026UnsecuredTermLoanIIMember" xlink:to="lab_fr_A2026UnsecuredTermLoanIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_56be43e2-de3c-4579-b405-5264c2cdac2a_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Lived Tangible Asset [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredRentReceivablesNet_62cb023b-18bf-4c3b-88a0-de29cf66d701_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRentReceivablesNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Rent Receivable</link:label>
    <link:label id="lab_us-gaap_DeferredRentReceivablesNet_label_en-US" xlink:label="lab_us-gaap_DeferredRentReceivablesNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Rent Receivables, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRentReceivablesNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredRentReceivablesNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRentReceivablesNet" xlink:to="lab_us-gaap_DeferredRentReceivablesNet" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock_b1c6cc2b-5d2c-40bc-aa17-927edee0d4b5_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule III: Real Estate and Accumulated Depreciation</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveSevenOneOneNPineHillsRoadMember_019c48ab-8474-7981-866d-879664b64f09_terseLabel_en-US" xlink:label="lab_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5711 N. Pine Hills Road</link:label>
    <link:label id="lab_fr_FiveSevenOneOneNPineHillsRoadMember_label_en-US" xlink:label="lab_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Seven One One N Pine Hills Road [Member]</link:label>
    <link:label id="lab_fr_FiveSevenOneOneNPineHillsRoadMember_documentation_en-US" xlink:label="lab_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Seven One One N Pine Hills Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:href="fr-20251231.xsd#fr_FiveSevenOneOneNPineHillsRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:to="lab_fr_FiveSevenOneOneNPineHillsRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_89d67475-1f8d-48bc-8d45-93d90d456a40_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification Out of Accumulated Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:to="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PvpTableTextBlock_terseLabel_en-US" xlink:label="lab_ecd_PvpTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pay vs Performance Disclosure, Table</link:label>
    <link:label id="lab_ecd_PvpTableTextBlock_label_en-US" xlink:label="lab_ecd_PvpTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pay vs Performance [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PvpTableTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PvpTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PvpTableTextBlock" xlink:to="lab_ecd_PvpTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt_terseLabel_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Violation of Home Country Law, Amount</link:label>
    <link:label id="lab_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt_label_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Violation of Home Country Law, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:to="lab_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_15648377-311c-45c4-80a6-648b57252cc3_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_8d970cbf-e37b-4eef-b61b-c15079190547_negatedLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_14923f0a-7e97-4402-951d-e03b3cee2f24_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfFinancingCosts" xlink:to="lab_us-gaap_AmortizationOfFinancingCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_aeece6ea-a3bc-48a5-9050-08cdc0f36462_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityTaxIdentificationNumber" xlink:to="lab_dei_EntityTaxIdentificationNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixZeroSevenEastSamHoustonParkwayMember_184f6fb0-c9f5-45c6-a1aa-cd3f7b78649a_terseLabel_en-US" xlink:label="lab_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">607 East Sam Houston Parkway [Member]</link:label>
    <link:label id="lab_fr_SixZeroSevenEastSamHoustonParkwayMember_label_en-US" xlink:label="lab_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Zero Seven East Sam Houston Parkway [Member]</link:label>
    <link:label id="lab_fr_SixZeroSevenEastSamHoustonParkwayMember_documentation_en-US" xlink:label="lab_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Zero Seven East Sam Houston Parkway [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:href="fr-20251231.xsd#fr_SixZeroSevenEastSamHoustonParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:to="lab_fr_SixZeroSevenEastSamHoustonParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember_9dbbe973-f999-4641-aa1c-36b1c8d6c11f_terseLabel_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2780 Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember_label_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Seven Hundred And Eighty Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember_documentation_en-US" xlink:label="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand seven hundred and eighty commerce drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:href="fr-20251231.xsd#fr_TwoThousandSevenHundredAndEightyCommerceDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:to="lab_fr_TwoThousandSevenHundredAndEightyCommerceDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock_4c9af467-3592-4835-8152-aee8df1704c7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Real Estate Partnerships' Summarized Balance Sheet</link:label>
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Variable Interest Entities [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:to="lab_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NumberOfRealEstateProperties_cd3b70ea-bf2f-44ff-a701-6141bb441d64_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfRealEstateProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of industrial properties owned</link:label>
    <link:label id="lab_us-gaap_NumberOfRealEstateProperties_c072a6ce-2fea-4203-a64a-29437f72340c_verboseLabel_en-US" xlink:label="lab_us-gaap_NumberOfRealEstateProperties" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of industrial properties</link:label>
    <link:label id="lab_us-gaap_NumberOfRealEstateProperties_label_en-US" xlink:label="lab_us-gaap_NumberOfRealEstateProperties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Real Estate Properties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRealEstateProperties" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfRealEstateProperties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfRealEstateProperties" xlink:to="lab_us-gaap_NumberOfRealEstateProperties" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroEightSevenParkPlaceMember_d88a3eb9-2cbb-43c7-a5cc-b5c18bbbac09_terseLabel_en-US" xlink:label="lab_fr_OneZeroEightSevenParkPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1087 Park Place [Member]</link:label>
    <link:label id="lab_fr_OneZeroEightSevenParkPlaceMember_label_en-US" xlink:label="lab_fr_OneZeroEightSevenParkPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Eight Seven Park Place [Member]</link:label>
    <link:label id="lab_fr_OneZeroEightSevenParkPlaceMember_documentation_en-US" xlink:label="lab_fr_OneZeroEightSevenParkPlaceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One zero eight seven Park Place.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroEightSevenParkPlaceMember" xlink:href="fr-20251231.xsd#fr_OneZeroEightSevenParkPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroEightSevenParkPlaceMember" xlink:to="lab_fr_OneZeroEightSevenParkPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember_ea1bd432-ab3c-45cb-bae5-f91d241c847d_terseLabel_en-US" xlink:label="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7801 W. Industrial Drive [Member]</link:label>
    <link:label id="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember_label_en-US" xlink:label="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Thousand Eight Hundred One W Industrial Drive [Member]</link:label>
    <link:label id="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember_documentation_en-US" xlink:label="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven thousand eight hundred one W Industrial Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:href="fr-20251231.xsd#fr_SevenThousandEightHundredOneWIndustrialDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:to="lab_fr_SevenThousandEightHundredOneWIndustrialDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourEightFiveOneHomesteadRoadMember_0b62156e-810b-4a26-8521-d1bc46b37cde_terseLabel_en-US" xlink:label="lab_fr_FourEightFiveOneHomesteadRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4851 Homestead Road [Member]</link:label>
    <link:label id="lab_fr_FourEightFiveOneHomesteadRoadMember_label_en-US" xlink:label="lab_fr_FourEightFiveOneHomesteadRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Eight Five One Homestead Road [Member]</link:label>
    <link:label id="lab_fr_FourEightFiveOneHomesteadRoadMember_documentation_en-US" xlink:label="lab_fr_FourEightFiveOneHomesteadRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four eight five one Homestead Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourEightFiveOneHomesteadRoadMember" xlink:href="fr-20251231.xsd#fr_FourEightFiveOneHomesteadRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourEightFiveOneHomesteadRoadMember" xlink:to="lab_fr_FourEightFiveOneHomesteadRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_019c45ab-770b-7697-a999-e7011c8da9ab_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total for Operating Partnership</link:label>
    <link:label id="lab_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_label_en-US" xlink:label="lab_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember" xlink:to="lab_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ElevenThousandOneHundredTenPepperRoadMember_376e677c-e68e-4088-b474-13d18304bc14_terseLabel_en-US" xlink:label="lab_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11110 Pepper Road [Member]</link:label>
    <link:label id="lab_fr_ElevenThousandOneHundredTenPepperRoadMember_label_en-US" xlink:label="lab_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eleven Thousand One Hundred Ten Pepper Road [Member]</link:label>
    <link:label id="lab_fr_ElevenThousandOneHundredTenPepperRoadMember_documentation_en-US" xlink:label="lab_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eleven thousand one hundred ten pepper road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:href="fr-20251231.xsd#fr_ElevenThousandOneHundredTenPepperRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:to="lab_fr_ElevenThousandOneHundredTenPepperRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_867eadff-9d85-474c-b16d-c6b89925040b_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock, shares issued</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued" xlink:to="lab_us-gaap_CommonStockSharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember_296cae96-821b-47b3-8f23-073b02c85813_terseLabel_en-US" xlink:label="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2500 N.W. 19th Street [Member]</link:label>
    <link:label id="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember_label_en-US" xlink:label="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Five Zero Zero North West Nineteenth Street [Member]</link:label>
    <link:label id="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember_documentation_en-US" xlink:label="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Five Zero Zero North West Nineteenth Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:href="fr-20251231.xsd#fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:to="lab_fr_TwoFiveZeroZeroNorthWestNineteenthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_0201031f-28cf-4718-aa66-7b168cfc3e5f_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Remaining Lease Term</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Remaining Lease Term</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_77d86b07-e766-419e-a043-514b4cb0c6f9_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, Year Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember_3d8a62e8-5dd3-446b-8a9a-77e224de5d66_terseLabel_en-US" xlink:label="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1225 Bengies Road [Member]</link:label>
    <link:label id="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember_label_en-US" xlink:label="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Thousand Two Hundred Twenty Five Bengies Road [Member]</link:label>
    <link:label id="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember_documentation_en-US" xlink:label="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One thousand two hundred twenty five Bengies Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:href="fr-20251231.xsd#fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:to="lab_fr_OneThousandTwoHundredTwentyFiveBengiesRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember_93be9982-5754-4290-82a9-ebe0c27d96a2_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3365-3385 Rauch Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember_label_en-US" xlink:label="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Six Five to Three Three Eight Five Rauch Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three three six five to three three eight five Rauch Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:to="lab_fr_ThreeThreeSixFivetoThreeThreeEightFiveRauchStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityPublicFloat_b905d2a5-e872-4ec2-8e42-8051213dbdb4_terseLabel_en-US" xlink:label="lab_dei_EntityPublicFloat" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Public Float</link:label>
    <link:label id="lab_dei_EntityPublicFloat_label_en-US" xlink:label="lab_dei_EntityPublicFloat" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Public Float</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityPublicFloat"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityPublicFloat" xlink:to="lab_dei_EntityPublicFloat" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroFourBordentownHeddingRoadMember_e99c1cfa-5dfd-4fef-ae14-752a18f7002d_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">304 Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFourBordentownHeddingRoadMember_label_en-US" xlink:label="lab_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero Four Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroFourBordentownHeddingRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Zero Four Bordentown Hedding Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroFourBordentownHeddingRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:to="lab_fr_ThreeZeroFourBordentownHeddingRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TradingArrAxis_terseLabel_en-US" xlink:label="lab_ecd_TradingArrAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Arrangement:</link:label>
    <link:label id="lab_ecd_TradingArrAxis_label_en-US" xlink:label="lab_ecd_TradingArrAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TradingArrAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TradingArrAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TradingArrAxis" xlink:to="lab_ecd_TradingArrAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember_cbada742-cb77-4cbf-bbe2-4b6e7452bc8f_terseLabel_en-US" xlink:label="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4071 Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember_label_en-US" xlink:label="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Zero Seven One Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember_documentation_en-US" xlink:label="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four zero seven one southmeadow parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:href="fr-20251231.xsd#fr_FourZeroSevenOneSouthmeadowParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:to="lab_fr_FourZeroSevenOneSouthmeadowParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TotalShareholderRtnAmt_terseLabel_en-US" xlink:label="lab_ecd_TotalShareholderRtnAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Shareholder Return Amount</link:label>
    <link:label id="lab_ecd_TotalShareholderRtnAmt_label_en-US" xlink:label="lab_ecd_TotalShareholderRtnAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Shareholder Return Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TotalShareholderRtnAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TotalShareholderRtnAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TotalShareholderRtnAmt" xlink:to="lab_ecd_TotalShareholderRtnAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseLeaseIncome_ab19baf5-9b57-429c-971b-caaa0b521365_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease Revenue</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLeaseIncome_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Lease Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLeaseIncome" xlink:to="lab_us-gaap_OperatingLeaseLeaseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember_07de268a-2b49-4dcd-a1c8-abe5709dc9a9_terseLabel_en-US" xlink:label="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2485-2505 Merritt Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember_label_en-US" xlink:label="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Eight Five To Two Five Zero Five Merritt Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember_documentation_en-US" xlink:label="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two four eight five to two five zero five Merritt Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:href="fr-20251231.xsd#fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:to="lab_fr_TwoFourEightFiveToTwoFiveZeroFiveMerrittDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SecurityExchangeName_18e7c013-7e12-48a8-bc14-43ae64db9bbb_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:label id="lab_dei_SecurityExchangeName_label_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName" xlink:to="lab_dei_SecurityExchangeName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixOneOneEastSamHoustonParkwaySMember_85247f22-5402-4723-b635-45a9315099ec_terseLabel_en-US" xlink:label="lab_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">611 East Sam Houston Parkway S [Member]</link:label>
    <link:label id="lab_fr_SixOneOneEastSamHoustonParkwaySMember_label_en-US" xlink:label="lab_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six One One East Sam Houston Parkway S [Member]</link:label>
    <link:label id="lab_fr_SixOneOneEastSamHoustonParkwaySMember_documentation_en-US" xlink:label="lab_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six One One East Sam Houston Parkway S [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:href="fr-20251231.xsd#fr_SixOneOneEastSamHoustonParkwaySMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:to="lab_fr_SixOneOneEastSamHoustonParkwaySMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_7ba21efc-09f3-44f1-9cf0-a96fb1c1dc8b_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember_35432458-3bac-48d9-9669-7fec2ab39249_terseLabel_en-US" xlink:label="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22520 Randolph Drive [Member]</link:label>
    <link:label id="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember_label_en-US" xlink:label="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TwentyTwoThousandFiveHundredTwentyRandolphDrive [Member]</link:label>
    <link:label id="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember_documentation_en-US" xlink:label="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TwentyTwoThousandFiveHundredTwentyRandolphDrive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:href="fr-20251231.xsd#fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:to="lab_fr_TwentyTwoThousandFiveHundredTwentyRandolphDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_8324063c-c9f9-4d27-a11b-d7111d5c7e11_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate</link:label>
    <link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_label_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Expenditures Incurred but Not yet Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:to="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c30b6d75-09a7-441e-bceb-c047ac376be7_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, additional borrowings capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TenantImprovementsUsefulLife_81f4319e-1a2a-4854-b595-ace3c2dc1f41_terseLabel_en-US" xlink:label="lab_fr_TenantImprovementsUsefulLife" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tenant improvements, useful life</link:label>
    <link:label id="lab_fr_TenantImprovementsUsefulLife_label_en-US" xlink:label="lab_fr_TenantImprovementsUsefulLife" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tenant Improvements Useful Life</link:label>
    <link:label id="lab_fr_TenantImprovementsUsefulLife_documentation_en-US" xlink:label="lab_fr_TenantImprovementsUsefulLife" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tenant Improvements Useful Life</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TenantImprovementsUsefulLife" xlink:href="fr-20251231.xsd#fr_TenantImprovementsUsefulLife"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TenantImprovementsUsefulLife" xlink:to="lab_fr_TenantImprovementsUsefulLife" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnersCapitalAccountUnitBasedCompensation_7bb0c89f-11c0-441b-8dcc-f9180cf9cf5c_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountUnitBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Based Compensation Activity</link:label>
    <link:label id="lab_us-gaap_PartnersCapitalAccountUnitBasedCompensation_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountUnitBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital Account, Unit-Based Payment Arrangement, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalAccountUnitBasedCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation" xlink:to="lab_us-gaap_PartnersCapitalAccountUnitBasedCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember_33878e69-db64-4147-be02-0a3334da8b00_terseLabel_en-US" xlink:label="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7005 E. 46th Avenue Drive [Member]</link:label>
    <link:label id="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember_label_en-US" xlink:label="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Thousand Five E Forty Six Th Avenue Drive [Member]</link:label>
    <link:label id="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember_documentation_en-US" xlink:label="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven thousand five E forty six th Avenue Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:href="fr-20251231.xsd#fr_SevenThousandFiveEFortySixThAvenueDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:to="lab_fr_SevenThousandFiveEFortySixThAvenueDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourNineOneZeroSummitDriveMember_41e118b9-276f-4ff0-81e3-42802e3c0b9e_terseLabel_en-US" xlink:label="lab_fr_OneFourNineOneZeroSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14910 Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineOneZeroSummitDriveMember_label_en-US" xlink:label="lab_fr_OneFourNineOneZeroSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine One Zero Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineOneZeroSummitDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourNineOneZeroSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine One Zero Summit Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourNineOneZeroSummitDriveMember" xlink:href="fr-20251231.xsd#fr_OneFourNineOneZeroSummitDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourNineOneZeroSummitDriveMember" xlink:to="lab_fr_OneFourNineOneZeroSummitDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoEightOneCouchvillePikeMember_670e3cdc-14e8-4876-b32b-448cd4ded7a1_terseLabel_en-US" xlink:label="lab_fr_OneTwoEightOneCouchvillePikeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1281 Couchville Pike</link:label>
    <link:label id="lab_fr_OneTwoEightOneCouchvillePikeMember_label_en-US" xlink:label="lab_fr_OneTwoEightOneCouchvillePikeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Eight One Couchville Pike [Member]</link:label>
    <link:label id="lab_fr_OneTwoEightOneCouchvillePikeMember_documentation_en-US" xlink:label="lab_fr_OneTwoEightOneCouchvillePikeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Eight One Couchville Pike</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoEightOneCouchvillePikeMember" xlink:href="fr-20251231.xsd#fr_OneTwoEightOneCouchvillePikeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoEightOneCouchvillePikeMember" xlink:to="lab_fr_OneTwoEightOneCouchvillePikeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementLineItems_45fbd697-6e22-44b0-ab9e-5396cd4c2fc9_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_258c468a-d8d9-490f-adb9-56cf801a1efb_verboseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_label_en-US" xlink:label="lab_us-gaap_StatementLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementLineItems" xlink:to="lab_us-gaap_StatementLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NoncontrollingInterestsPolicyTextBlock_6c771169-9cbb-4dcf-ada3-928896041ff6_terseLabel_en-US" xlink:label="lab_fr_NoncontrollingInterestsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests</link:label>
    <link:label id="lab_fr_NoncontrollingInterestsPolicyTextBlock_label_en-US" xlink:label="lab_fr_NoncontrollingInterestsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests [Policy Text Block]</link:label>
    <link:label id="lab_fr_NoncontrollingInterestsPolicyTextBlock_documentation_en-US" xlink:label="lab_fr_NoncontrollingInterestsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NoncontrollingInterestsPolicyTextBlock" xlink:href="fr-20251231.xsd#fr_NoncontrollingInterestsPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NoncontrollingInterestsPolicyTextBlock" xlink:to="lab_fr_NoncontrollingInterestsPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ExtinguishmentOfDebtAmount_21634527-d2e7-4701-8b3d-32d970ed7421_terseLabel_en-US" xlink:label="lab_us-gaap_ExtinguishmentOfDebtAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Extinguishment of debt, amount</link:label>
    <link:label id="lab_us-gaap_ExtinguishmentOfDebtAmount_label_en-US" xlink:label="lab_us-gaap_ExtinguishmentOfDebtAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Extinguishment of Debt, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ExtinguishmentOfDebtAmount" xlink:to="lab_us-gaap_ExtinguishmentOfDebtAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroOneFiveParamountMember_30584a67-7a36-4f63-b542-940fcf604c67_terseLabel_en-US" xlink:label="lab_fr_EightZeroOneFiveParamountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8015 Paramount [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneFiveParamountMember_label_en-US" xlink:label="lab_fr_EightZeroOneFiveParamountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero One Five Paramount [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneFiveParamountMember_documentation_en-US" xlink:label="lab_fr_EightZeroOneFiveParamountMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight zero one five paramount.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroOneFiveParamountMember" xlink:href="fr-20251231.xsd#fr_EightZeroOneFiveParamountMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroOneFiveParamountMember" xlink:to="lab_fr_EightZeroOneFiveParamountMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_Rule10b51ArrAdoptedFlag_terseLabel_en-US" xlink:label="lab_ecd_Rule10b51ArrAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rule 10b5-1 Arrangement Adopted</link:label>
    <link:label id="lab_ecd_Rule10b51ArrAdoptedFlag_label_en-US" xlink:label="lab_ecd_Rule10b51ArrAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rule 10b5-1 Arrangement Adopted [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Rule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrAdoptedFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_Rule10b51ArrAdoptedFlag" xlink:to="lab_ecd_Rule10b51ArrAdoptedFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_2b2c7c91-e426-4ac6-b636-b4a1806265d0_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_ca381648-cd5f-40ad-afef-6879247ef057_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General Partner Units (132,470,326 and 132,349,119&#160;units outstanding)</link:label>
    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_label_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General Partners' Capital Account</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralPartnersCapitalAccount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralPartnersCapitalAccount" xlink:to="lab_us-gaap_GeneralPartnersCapitalAccount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember_5833accb-7530-412f-bae8-c569b45c0ead_terseLabel_en-US" xlink:label="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">15551 Boyle Avenue</link:label>
    <link:label id="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember_label_en-US" xlink:label="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Five Five Five One Boyle Avenue [Member]</link:label>
    <link:label id="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember_documentation_en-US" xlink:label="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Five Five Five One Boyle Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:href="fr-20251231.xsd#fr_OneFiveFiveFiveOneBoyleAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:to="lab_fr_OneFiveFiveFiveOneBoyleAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2030TreasuryLocksMember_019c44d4-f9c4-726d-b1a4-77150a971182_terseLabel_en-US" xlink:label="lab_fr_A2030TreasuryLocksMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030 Treasury Locks</link:label>
    <link:label id="lab_fr_A2030TreasuryLocksMember_label_en-US" xlink:label="lab_fr_A2030TreasuryLocksMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2030 Treasury Locks [Member]</link:label>
    <link:label id="lab_fr_A2030TreasuryLocksMember_documentation_en-US" xlink:label="lab_fr_A2030TreasuryLocksMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2030 Treasury Locks</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2030TreasuryLocksMember" xlink:href="fr-20251231.xsd#fr_A2030TreasuryLocksMember"/>
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    <link:label id="lab_fr_OneEightFiveZeroOneWStanfordRoadMember_4d802af6-00c0-4d77-b4ec-151aae45128a_terseLabel_en-US" xlink:label="lab_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">18501 W Stanford Road</link:label>
    <link:label id="lab_fr_OneEightFiveZeroOneWStanfordRoadMember_label_en-US" xlink:label="lab_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight Five Zero One W Stanford Road [Member]</link:label>
    <link:label id="lab_fr_OneEightFiveZeroOneWStanfordRoadMember_documentation_en-US" xlink:label="lab_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Eight Five Zero One W Stanford Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:href="fr-20251231.xsd#fr_OneEightFiveZeroOneWStanfordRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:to="lab_fr_OneEightFiveZeroOneWStanfordRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixFourNineNineNWTwelfthAvenueMember_59394089-b435-4a76-954d-6e1d652bbc71_terseLabel_en-US" xlink:label="lab_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6499 NW 12th Avenue</link:label>
    <link:label id="lab_fr_SixFourNineNineNWTwelfthAvenueMember_label_en-US" xlink:label="lab_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Four Nine Nine NW Twelfth Avenue [Member]</link:label>
    <link:label id="lab_fr_SixFourNineNineNWTwelfthAvenueMember_documentation_en-US" xlink:label="lab_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Four Nine Nine NW Twelfth Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:href="fr-20251231.xsd#fr_SixFourNineNineNWTwelfthAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:to="lab_fr_SixFourNineNineNWTwelfthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventLineItems_f66718e9-2692-4a2a-83dd-895c46973775_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event [Line Items]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventLineItems_label_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventLineItems" xlink:to="lab_us-gaap_SubsequentEventLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DevelopmentInProcess_49876700-3962-4baa-9c01-972bed9d092c_terseLabel_en-US" xlink:label="lab_us-gaap_DevelopmentInProcess" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in Progress</link:label>
    <link:label id="lab_us-gaap_DevelopmentInProcess_label_en-US" xlink:label="lab_us-gaap_DevelopmentInProcess" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Development in Process</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopmentInProcess" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopmentInProcess"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DevelopmentInProcess" xlink:to="lab_us-gaap_DevelopmentInProcess" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockMember_4a947989-b828-47f2-8f0f-5f5250f014a9_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock</link:label>
    <link:label id="lab_us-gaap_CommonStockMember_label_en-US" xlink:label="lab_us-gaap_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockMember" xlink:to="lab_us-gaap_CommonStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3dfa946f-61a8-42cf-aec8-5541d939dac2_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting of Performance Units</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_00793ad8-ca6e-486b-b7f1-1265859c4f11_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Vested, Awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_3e866de0-76c0-44e0-86bf-46534dd748ff_negatedLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Accumulated Depreciation</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_13fb6f93-94c8-475f-81d7-035d1051d55d_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance, End of Year Excluding Real Estate Held for Sale</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Accumulated Depreciation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:to="lab_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineNineEightMelissaLaneMember_56d02d40-e2d1-4f28-ab12-be9831716707_terseLabel_en-US" xlink:label="lab_fr_OneNineNineEightMelissaLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1998 Melissa Lane [Member]</link:label>
    <link:label id="lab_fr_OneNineNineEightMelissaLaneMember_label_en-US" xlink:label="lab_fr_OneNineNineEightMelissaLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Nine Eight Melissa Lane [Member]</link:label>
    <link:label id="lab_fr_OneNineNineEightMelissaLaneMember_documentation_en-US" xlink:label="lab_fr_OneNineNineEightMelissaLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Nine Nine Eight Melissa Lane [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineNineEightMelissaLaneMember" xlink:href="fr-20251231.xsd#fr_OneNineNineEightMelissaLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineNineEightMelissaLaneMember" xlink:to="lab_fr_OneNineNineEightMelissaLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OrdinaryIncomePerShare_1dfda087-6405-4b15-a4ed-d9042d02f3ac_terseLabel_en-US" xlink:label="lab_fr_OrdinaryIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ordinary Income (A)</link:label>
    <link:label id="lab_fr_OrdinaryIncomePerShare_label_en-US" xlink:label="lab_fr_OrdinaryIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ordinary Income Per Share</link:label>
    <link:label id="lab_fr_OrdinaryIncomePerShare_documentation_en-US" xlink:label="lab_fr_OrdinaryIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ordinary income per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OrdinaryIncomePerShare" xlink:href="fr-20251231.xsd#fr_OrdinaryIncomePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OrdinaryIncomePerShare" xlink:to="lab_fr_OrdinaryIncomePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember_d1024911-d4d0-4543-b948-2ede53691570_terseLabel_en-US" xlink:label="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2234 West Taft Vineland Road</link:label>
    <link:label id="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember_label_en-US" xlink:label="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Three Four West Taft Vineland Road [Member]</link:label>
    <link:label id="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember_documentation_en-US" xlink:label="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Two Three Four West Taft Vineland Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:href="fr-20251231.xsd#fr_TwoTwoThreeFourWestTaftVinelandRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:to="lab_fr_TwoTwoThreeFourWestTaftVinelandRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareCashPaid_0025ec61-17e4-4bca-b562-68706b586e66_totalLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareCashPaid" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Distributions Per Common Share</link:label>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareCashPaid_label_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareCashPaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Dividends, Per Share, Cash Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockDividendsPerShareCashPaid" xlink:to="lab_us-gaap_CommonStockDividendsPerShareCashPaid" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_75f35e47-aa3c-4c4d-af50-8fdd39d49212_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_label_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="lab_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember_0a232768-dc34-4fd4-9f66-5c86ee58e34e_terseLabel_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028 Notes</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember_label_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due Two Thousand Twenty Eight Notes [Member]</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember_documentation_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior notes due two thousand twenty eight notes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:href="fr-20251231.xsd#fr_SeniorNotesDueTwoThousandTwentyEightNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:to="lab_fr_SeniorNotesDueTwoThousandTwentyEightNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeMember_e3ce17e9-29ec-4d6a-bec9-6d9935e013a6_terseLabel_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:label id="lab_srt_RangeMember_label_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember" xlink:to="lab_srt_RangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember_2272d0f3-420e-40b2-a560-49e0053c96f2_terseLabel_en-US" xlink:label="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4580 N. Pebble Creek Parkway</link:label>
    <link:label id="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember_label_en-US" xlink:label="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Five Eight Zero N Pebble Creek Parkway [Member]</link:label>
    <link:label id="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember_documentation_en-US" xlink:label="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Five Eight Zero N Pebble Creek Parkway</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:href="fr-20251231.xsd#fr_FourFiveEightZeroNPebbleCreekParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:to="lab_fr_FourFiveEightZeroNPebbleCreekParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_b7cb3459-318a-43fb-ba23-fbc03a807d37_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember_a122b0c9-f13c-42fa-8447-8e5b714337f6_terseLabel_en-US" xlink:label="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">28545 Livingston Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember_label_en-US" xlink:label="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Eight Five Four Five Livingston Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Eight Five Four Five Livingston Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoEightFiveFourFiveLivingstonAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:to="lab_fr_TwoEightFiveFourFiveLivingstonAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_AuditInformationAbstract_0ce22f6f-f985-4067-8bb4-4a3ce32dbb08_terseLabel_en-US" xlink:label="lab_fr_AuditInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Audit Information [Abstract]</link:label>
    <link:label id="lab_fr_AuditInformationAbstract_label_en-US" xlink:label="lab_fr_AuditInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Audit Information [Abstract]</link:label>
    <link:label id="lab_fr_AuditInformationAbstract_documentation_en-US" xlink:label="lab_fr_AuditInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Audit Information</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_AuditInformationAbstract" xlink:href="fr-20251231.xsd#fr_AuditInformationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_AuditInformationAbstract" xlink:to="lab_fr_AuditInformationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeSevenZeroZeroSandshellDriveMember_d72cf375-6583-4f59-9e3d-9b0493d47fe3_terseLabel_en-US" xlink:label="lab_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3700 Sandshell Drive [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenZeroZeroSandshellDriveMember_label_en-US" xlink:label="lab_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Seven Zero Zero Sandshell Drive [Member]</link:label>
    <link:label id="lab_fr_ThreeSevenZeroZeroSandshellDriveMember_documentation_en-US" xlink:label="lab_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Seven Zero Zero Sandshell Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:href="fr-20251231.xsd#fr_ThreeSevenZeroZeroSandshellDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:to="lab_fr_ThreeSevenZeroZeroSandshellDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestRateSwapMember_236c5f00-e00b-45f1-bbaa-0ff5e65558e1_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate Swap</link:label>
    <link:label id="lab_us-gaap_InterestRateSwapMember_label_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateSwapMember" xlink:to="lab_us-gaap_InterestRateSwapMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_a5bc7329-b689-4cd7-8c2d-c11b72094a3f_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity in Income of Joint Venture</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_32c71e8b-a16f-4ed7-85e2-17f9228afb9b_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Equity in Income of Joint Venture</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Equity Method Investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:to="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LeasesAbstract_f70a2627-082a-4f13-bd05-c429302fe9ad_terseLabel_en-US" xlink:label="lab_us-gaap_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:label id="lab_us-gaap_LeasesAbstract_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeasesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract" xlink:to="lab_us-gaap_LeasesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_9236c5df-1a1a-4f59-aaac-ef7bd6c843e9_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic Earnings Per Share / Unit:</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract" xlink:to="lab_us-gaap_EarningsPerShareBasicAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_0426f286-de08-4964-b796-afcacba55bf5_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand_9a06e715-bd3f-4318-9856-ffe58f3bdff7_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land</link:label>
    <link:label id="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand_label_en-US" xlink:label="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand" xlink:to="lab_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember_fc0c7215-985a-497f-baab-518fac0bea2b_terseLabel_en-US" xlink:label="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3600 North Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember_label_en-US" xlink:label="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Six Zero Zero North Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember_documentation_en-US" xlink:label="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Six Zero Zero North Cotton Lane</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:href="fr-20251231.xsd#fr_ThreeSixZeroZeroNorthCottonLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:to="lab_fr_ThreeSixZeroZeroNorthCottonLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract_897b75f5-2639-4a12-9ff0-d90f6f18dc3d_terseLabel_en-US" xlink:label="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exchange of Limited Partner Units for Common Stock/General Partner Units</link:label>
    <link:label id="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract_label_en-US" xlink:label="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exchange Of Limited Partnership Units For General Partnership Units [Abstract]</link:label>
    <link:label id="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract_documentation_en-US" xlink:label="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exchange of Limited partnership units for General partnership units.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:href="fr-20251231.xsd#fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:to="lab_fr_ExchangeOfLimitedPartnershipUnitsForGeneralPartnershipUnitsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstIndustrialLPMember_5544bd0f-68d3-4f3f-9627-955a854ff245_terseLabel_en-US" xlink:label="lab_fr_FirstIndustrialLPMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Industrial, L.P.</link:label>
    <link:label id="lab_fr_FirstIndustrialLPMember_label_en-US" xlink:label="lab_fr_FirstIndustrialLPMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Industrial LP [Member]</link:label>
    <link:label id="lab_fr_FirstIndustrialLPMember_documentation_en-US" xlink:label="lab_fr_FirstIndustrialLPMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Industrial LP [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FirstIndustrialLPMember" xlink:href="fr-20251231.xsd#fr_FirstIndustrialLPMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FirstIndustrialLPMember" xlink:to="lab_fr_FirstIndustrialLPMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixEightNineOneNWSevenFourTHStreetMember_dd1e8fa1-7a63-4eaf-a3ea-0085c5dfd914_terseLabel_en-US" xlink:label="lab_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6891 NW 74th Street [Member]</link:label>
    <link:label id="lab_fr_SixEightNineOneNWSevenFourTHStreetMember_label_en-US" xlink:label="lab_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Eight Nine One NW Seven Four TH Street [Member]</link:label>
    <link:label id="lab_fr_SixEightNineOneNWSevenFourTHStreetMember_documentation_en-US" xlink:label="lab_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Eight Nine One NW Seven Four TH Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:href="fr-20251231.xsd#fr_SixEightNineOneNWSevenFourTHStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:to="lab_fr_SixEightNineOneNWSevenFourTHStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVenturesMember_883b20d6-f05a-4e2b-89de-714e43ea9796_terseLabel_en-US" xlink:label="lab_fr_JointVenturesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Ventures</link:label>
    <link:label id="lab_fr_JointVenturesMember_label_en-US" xlink:label="lab_fr_JointVenturesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Ventures [Member]</link:label>
    <link:label id="lab_fr_JointVenturesMember_documentation_en-US" xlink:label="lab_fr_JointVenturesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Ventures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVenturesMember" xlink:href="fr-20251231.xsd#fr_JointVenturesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVenturesMember" xlink:to="lab_fr_JointVenturesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember_594917fc-bdf0-4bec-a184-0b88af712295_terseLabel_en-US" xlink:label="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24385 Nandina Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember_label_en-US" xlink:label="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Three Eight Five Nandina Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Three Eight Five Nandina Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoFourThreeEightFiveNandinaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:to="lab_fr_TwoFourThreeEightFiveNandinaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationAbstract_6b26c464-e18a-4c4d-bd50-18146e1c04e5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Noncash Expense [Abstract]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationAbstract_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Noncash Expense [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAbstract" xlink:to="lab_us-gaap_ShareBasedCompensationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TradingArrByIndTable_terseLabel_en-US" xlink:label="lab_ecd_TradingArrByIndTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Arrangements, by Individual</link:label>
    <link:label id="lab_ecd_TradingArrByIndTable_label_en-US" xlink:label="lab_ecd_TradingArrByIndTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangements, by Individual [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TradingArrByIndTable" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TradingArrByIndTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TradingArrByIndTable" xlink:to="lab_ecd_TradingArrByIndTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_5b65ecb2-2b5c-420d-8dfd-0e651f4d8004_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders/Unitholders</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_c152d650-e55d-4c8a-ad60-7097f85d8cbf_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders/Unitholders</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic" xlink:to="lab_us-gaap_EarningsPerShareBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandOneSalazarWayMember_cc2cd601-9b91-4676-87d8-4530e0c468dd_terseLabel_en-US" xlink:label="lab_fr_FourThousandOneSalazarWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4001 Salazar Way [Member]</link:label>
    <link:label id="lab_fr_FourThousandOneSalazarWayMember_label_en-US" xlink:label="lab_fr_FourThousandOneSalazarWayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand One Salazar Way [Member]</link:label>
    <link:label id="lab_fr_FourThousandOneSalazarWayMember_documentation_en-US" xlink:label="lab_fr_FourThousandOneSalazarWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four thousand one Salazar Way.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandOneSalazarWayMember" xlink:href="fr-20251231.xsd#fr_FourThousandOneSalazarWayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandOneSalazarWayMember" xlink:to="lab_fr_FourThousandOneSalazarWayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFiveZeroZeroEMainStreetMember_284930b1-72d2-4a07-b7ed-32dd4c6c0af7_terseLabel_en-US" xlink:label="lab_fr_OneFiveZeroZeroEMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1500 E. Main Street [Member]</link:label>
    <link:label id="lab_fr_OneFiveZeroZeroEMainStreetMember_label_en-US" xlink:label="lab_fr_OneFiveZeroZeroEMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Five Zero Zero E Main Street [Member]</link:label>
    <link:label id="lab_fr_OneFiveZeroZeroEMainStreetMember_documentation_en-US" xlink:label="lab_fr_OneFiveZeroZeroEMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">1500 E main street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFiveZeroZeroEMainStreetMember" xlink:href="fr-20251231.xsd#fr_OneFiveZeroZeroEMainStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFiveZeroZeroEMainStreetMember" xlink:to="lab_fr_OneFiveZeroZeroEMainStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixZeroZeroFiveTwentyFourthStreetEastMember_fdfeb87e-310b-45b8-970a-d02601a8c49b_terseLabel_en-US" xlink:label="lab_fr_SixZeroZeroFiveTwentyFourthStreetEastMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6005 24th Street East</link:label>
    <link:label id="lab_fr_SixZeroZeroFiveTwentyFourthStreetEastMember_label_en-US" xlink:label="lab_fr_SixZeroZeroFiveTwentyFourthStreetEastMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Zero Zero Five Twenty Fourth Street East [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixZeroZeroFiveTwentyFourthStreetEastMember" xlink:href="fr-20251231.xsd#fr_SixZeroZeroFiveTwentyFourthStreetEastMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixZeroZeroFiveTwentyFourthStreetEastMember" xlink:to="lab_fr_SixZeroZeroFiveTwentyFourthStreetEastMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThousandThreeHundredWindsorCourtMember_8ac236df-3f2d-445f-8980-fcfc5ec7799b_terseLabel_en-US" xlink:label="lab_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2300 Windsor Court [Member]</link:label>
    <link:label id="lab_fr_TwoThousandThreeHundredWindsorCourtMember_label_en-US" xlink:label="lab_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Three Hundred Windsor Court [Member]</link:label>
    <link:label id="lab_fr_TwoThousandThreeHundredWindsorCourtMember_documentation_en-US" xlink:label="lab_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand three hundred Windsor Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:href="fr-20251231.xsd#fr_TwoThousandThreeHundredWindsorCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:to="lab_fr_TwoThousandThreeHundredWindsorCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember_345cd87b-65a7-4f14-b87b-40f4cea50afe_terseLabel_en-US" xlink:label="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8200 NW 88th Street</link:label>
    <link:label id="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember_label_en-US" xlink:label="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Two Zero Zero NW Eighty Eighth Street [Member]</link:label>
    <link:label id="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember_documentation_en-US" xlink:label="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Two Zero Zero NW Eighty Eighth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:href="fr-20251231.xsd#fr_EightTwoZeroZeroNWEightyEighthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:to="lab_fr_EightTwoZeroZeroNWEightyEighthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_b24b08f2-849c-45d0-b017-50f8cea54b9a_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember_c6843d07-711f-47de-911d-eff825875d36_terseLabel_en-US" xlink:label="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">20320 80th Avenue South</link:label>
    <link:label id="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember_label_en-US" xlink:label="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Three Two Zero Eightieth Avenue South [Member]</link:label>
    <link:label id="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember_documentation_en-US" xlink:label="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Three Two Zero Eightieth Avenue South</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:href="fr-20251231.xsd#fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:to="lab_fr_TwoZeroThreeTwoZeroEightiethAvenueSouthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_Fr_HeldForSaleActivityMember_0c778a06-f465-4846-bff6-5c294308b29c_terseLabel_en-US" xlink:label="lab_fr_Fr_HeldForSaleActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Held For Sale Activity</link:label>
    <link:label id="lab_fr_Fr_HeldForSaleActivityMember_label_en-US" xlink:label="lab_fr_Fr_HeldForSaleActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">fr_HeldForSaleActivity [Member]</link:label>
    <link:label id="lab_fr_Fr_HeldForSaleActivityMember_documentation_en-US" xlink:label="lab_fr_Fr_HeldForSaleActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">fr_HeldForSaleActivity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_Fr_HeldForSaleActivityMember" xlink:href="fr-20251231.xsd#fr_Fr_HeldForSaleActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_Fr_HeldForSaleActivityMember" xlink:to="lab_fr_Fr_HeldForSaleActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixNineOneThreeGuhnRoadMember_7f7d75b1-8a41-4167-b928-acf850160c5a_terseLabel_en-US" xlink:label="lab_fr_SixNineOneThreeGuhnRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6913 Guhn Road [Member]</link:label>
    <link:label id="lab_fr_SixNineOneThreeGuhnRoadMember_label_en-US" xlink:label="lab_fr_SixNineOneThreeGuhnRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Nine One Three Guhn Road [Member]</link:label>
    <link:label id="lab_fr_SixNineOneThreeGuhnRoadMember_documentation_en-US" xlink:label="lab_fr_SixNineOneThreeGuhnRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Nine One Three Guhn Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixNineOneThreeGuhnRoadMember" xlink:href="fr-20251231.xsd#fr_SixNineOneThreeGuhnRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixNineOneThreeGuhnRoadMember" xlink:to="lab_fr_SixNineOneThreeGuhnRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFourFiveRisingSunRoadMember_fa881da3-e62e-41b0-8a7e-6f8096ee6ac4_terseLabel_en-US" xlink:label="lab_fr_FourFourFiveRisingSunRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">445 Rising Sun Road</link:label>
    <link:label id="lab_fr_FourFourFiveRisingSunRoadMember_label_en-US" xlink:label="lab_fr_FourFourFiveRisingSunRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Four Five Rising Sun Road [Member]</link:label>
    <link:label id="lab_fr_FourFourFiveRisingSunRoadMember_documentation_en-US" xlink:label="lab_fr_FourFourFiveRisingSunRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Four Five Rising Sun Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFourFiveRisingSunRoadMember" xlink:href="fr-20251231.xsd#fr_FourFourFiveRisingSunRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFourFiveRisingSunRoadMember" xlink:to="lab_fr_FourFourFiveRisingSunRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardTmgMnpiDiscTextBlock_terseLabel_en-US" xlink:label="lab_ecd_AwardTmgMnpiDiscTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Timing MNPI Disclosure</link:label>
    <link:label id="lab_ecd_AwardTmgMnpiDiscTextBlock_label_en-US" xlink:label="lab_ecd_AwardTmgMnpiDiscTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Timing MNPI Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgMnpiDiscTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardTmgMnpiDiscTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardTmgMnpiDiscTextBlock" xlink:to="lab_ecd_AwardTmgMnpiDiscTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BelowMarketLeaseAccumulatedAmortization_125fe70e-977e-405c-85ac-493582e0db90_terseLabel_en-US" xlink:label="lab_us-gaap_BelowMarketLeaseAccumulatedAmortization" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total accumulated amortization of deferred leasing intangibles included in total liabilities</link:label>
    <link:label id="lab_us-gaap_BelowMarketLeaseAccumulatedAmortization_label_en-US" xlink:label="lab_us-gaap_BelowMarketLeaseAccumulatedAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Below Market Lease, Accumulated Amortization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAccumulatedAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BelowMarketLeaseAccumulatedAmortization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BelowMarketLeaseAccumulatedAmortization" xlink:to="lab_us-gaap_BelowMarketLeaseAccumulatedAmortization" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroTwoFiveMckenzieDriveMember_9a4728fa-46b3-4f57-805d-6a2b4a047c46_terseLabel_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2025 McKenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoFiveMckenzieDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Two Five Mckenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoFiveMckenzieDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero two five mckenzie drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroTwoFiveMckenzieDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:to="lab_fr_TwoZeroTwoFiveMckenzieDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_b9148962-1025-4ba0-9721-583cff4a7864_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization related to restricted stock/Unit awards and LTIP Unit Awards</link:label>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_LeasesTermsMinimum_c77948a3-49c6-4d0e-9607-9b0af2823a23_terseLabel_en-US" xlink:label="lab_fr_LeasesTermsMinimum" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining Ground Lease Terms, Minimum</link:label>
    <link:label id="lab_fr_LeasesTermsMinimum_label_en-US" xlink:label="lab_fr_LeasesTermsMinimum" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases Terms Minimum</link:label>
    <link:label id="lab_fr_LeasesTermsMinimum_documentation_en-US" xlink:label="lab_fr_LeasesTermsMinimum" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leases Terms Minimum</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_LeasesTermsMinimum" xlink:href="fr-20251231.xsd#fr_LeasesTermsMinimum"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_LeasesTermsMinimum" xlink:to="lab_fr_LeasesTermsMinimum" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NumberOfExtensions_b7270a5b-12c4-443e-b018-2a38295cb0e3_terseLabel_en-US" xlink:label="lab_fr_NumberOfExtensions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Extensions</link:label>
    <link:label id="lab_fr_NumberOfExtensions_label_en-US" xlink:label="lab_fr_NumberOfExtensions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Extensions</link:label>
    <link:label id="lab_fr_NumberOfExtensions_documentation_en-US" xlink:label="lab_fr_NumberOfExtensions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of Extensions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NumberOfExtensions" xlink:href="fr-20251231.xsd#fr_NumberOfExtensions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NumberOfExtensions" xlink:to="lab_fr_NumberOfExtensions" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NotesPayableFairValueDisclosure_e17e1a67-71e6-418a-b3f6-b7d2fdd683a2_terseLabel_en-US" xlink:label="lab_us-gaap_NotesPayableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes, Net</link:label>
    <link:label id="lab_us-gaap_NotesPayableFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_NotesPayableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Payable, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NotesPayableFairValueDisclosure" xlink:to="lab_us-gaap_NotesPayableFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SecuredDebt_3d83f208-0d5c-4102-9c28-3bd0e1132b62_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Mortgage Loan Payable</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_label_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebt" xlink:to="lab_us-gaap_SecuredDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeZeroZeroMountainCreekMember_aec405d0-97d0-44f7-aac6-ff97b66db9d8_terseLabel_en-US" xlink:label="lab_fr_FiveThreeZeroZeroMountainCreekMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5300 Mountain Creek [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroZeroMountainCreekMember_label_en-US" xlink:label="lab_fr_FiveThreeZeroZeroMountainCreekMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Zero Zero Mountain Creek [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroZeroMountainCreekMember_documentation_en-US" xlink:label="lab_fr_FiveThreeZeroZeroMountainCreekMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Three Zero Zero Mountain Creek [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeZeroZeroMountainCreekMember" xlink:href="fr-20251231.xsd#fr_FiveThreeZeroZeroMountainCreekMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeZeroZeroMountainCreekMember" xlink:to="lab_fr_FiveThreeZeroZeroMountainCreekMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_b3ea2831-62ef-4da6-b832-07c544ed4878_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Liabilities and Equity/Partners' Capital</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember_66cdec47-07b2-42e6-8f2f-198449b746b8_terseLabel_en-US" xlink:label="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8810 W. 116th Circle [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember_label_en-US" xlink:label="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Thousand Eight Hundred Ten West One Hundred Sixteen Th Street [Member]</link:label>
    <link:label id="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember_documentation_en-US" xlink:label="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Thousand Eight Hundred Ten West One Hundred Sixteen Th Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:href="fr-20251231.xsd#fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:to="lab_fr_EightThousandEightHundredTenWestOneHundredSixteenThStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureBuildingsABAndCMember_019c4577-cdd7-7b03-b5ee-a6da54081cbb_terseLabel_en-US" xlink:label="lab_fr_JointVentureBuildingsABAndCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Buildings A, B and C</link:label>
    <link:label id="lab_fr_JointVentureBuildingsABAndCMember_label_en-US" xlink:label="lab_fr_JointVentureBuildingsABAndCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Buildings A, B and C [Member]</link:label>
    <link:label id="lab_fr_JointVentureBuildingsABAndCMember_documentation_en-US" xlink:label="lab_fr_JointVentureBuildingsABAndCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Buildings A, B and C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureBuildingsABAndCMember" xlink:href="fr-20251231.xsd#fr_JointVentureBuildingsABAndCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureBuildingsABAndCMember" xlink:to="lab_fr_JointVentureBuildingsABAndCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember_3349808d-7be4-41ae-bdfc-c2c2d4119ecb_terseLabel_en-US" xlink:label="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5300 and 5315 Nottingham Drive [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember_label_en-US" xlink:label="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Zero Zero and Five Three One Five Nottingham Drive [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember_documentation_en-US" xlink:label="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Three Zero Zero and Five Three One Five Nottingham Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:href="fr-20251231.xsd#fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:to="lab_fr_FiveThreeZeroZeroAndFiveThreeOneFiveNottinghamDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxAssetsOther_019c45c9-f452-70e6-9585-c265bf636158_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other - Temporary Differences</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsOther_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsOther" xlink:to="lab_us-gaap_DeferredTaxAssetsOther" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable_dc5a0be7-82a9-4a53-a27c-97b321034d59_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Method Investment [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateIncreaseDecrease_ed0af421-8844-4c54-abe4-13f4706e0baa_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateIncreaseDecrease" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Increase (Decrease)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateIncreaseDecrease_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateIncreaseDecrease" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Increase (Decrease)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateIncreaseDecrease"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateIncreaseDecrease" xlink:to="lab_us-gaap_DebtInstrumentInterestRateIncreaseDecrease" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_14e7e115-b614-4743-9c21-0a37d36c670b_terseLabel_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingPoliciesAbstract" xlink:to="lab_us-gaap_AccountingPoliciesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_5ec78d92-5a47-4667-aa90-402a4e21b6e6_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Maturity</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RepaymentsOfSecuredDebt_9b662a59-9896-49d1-b353-4bc77842e8dc_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfSecuredDebt" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repayments on Mortgage Loan Payable</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfSecuredDebt_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfSecuredDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Secured Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfSecuredDebt" xlink:to="lab_us-gaap_RepaymentsOfSecuredDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourWorldsFairDriveMember_af284e9b-9713-4b5d-85e7-99c665a5b6c7_terseLabel_en-US" xlink:label="lab_fr_OneFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14 World's Fair Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourWorldsFairDriveMember_label_en-US" xlink:label="lab_fr_OneFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Worlds Fair Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourWorldsFairDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One four World's Fair Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourWorldsFairDriveMember" xlink:href="fr-20251231.xsd#fr_OneFourWorldsFairDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourWorldsFairDriveMember" xlink:to="lab_fr_OneFourWorldsFairDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PayVsPerformanceDisclosureLineItems_label_en-US" xlink:label="lab_ecd_PayVsPerformanceDisclosureLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pay vs Performance Disclosure [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PayVsPerformanceDisclosureLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="lab_ecd_PayVsPerformanceDisclosureLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureBuildingBMember_019c4515-7e01-7314-95fd-eb13a1e7fad7_terseLabel_en-US" xlink:label="lab_fr_JointVentureBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Building B</link:label>
    <link:label id="lab_fr_JointVentureBuildingBMember_label_en-US" xlink:label="lab_fr_JointVentureBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Building B [Member]</link:label>
    <link:label id="lab_fr_JointVentureBuildingBMember_documentation_en-US" xlink:label="lab_fr_JointVentureBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Building B</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureBuildingBMember" xlink:href="fr-20251231.xsd#fr_JointVentureBuildingBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureBuildingBMember" xlink:to="lab_fr_JointVentureBuildingBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseLiability_c7ac108b-1a79-421e-afd5-8fd219169434_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease Liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiability_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability" xlink:to="lab_us-gaap_OperatingLeaseLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LoansPayableFairValueDisclosure_c4837378-957c-4d10-b874-9aa60e67d841_terseLabel_en-US" xlink:label="lab_us-gaap_LoansPayableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage Loan Payable</link:label>
    <link:label id="lab_us-gaap_LoansPayableFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_LoansPayableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansPayableFairValueDisclosure" xlink:to="lab_us-gaap_LoansPayableFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember_8e3d5bd5-2f65-4d24-9bf4-ed63f958f78e_terseLabel_en-US" xlink:label="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5952-5978 North Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember_label_en-US" xlink:label="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Nine Five Two Five Nine Seven Eight North Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember_documentation_en-US" xlink:label="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Nine Five Two Five Nine Seven Eight North Broadway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:href="fr-20251231.xsd#fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:to="lab_fr_FiveNineFiveTwoFiveNineSevenEightNorthBroadwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_9fd72dbc-c70c-4091-be85-b3ea7b4b398a_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LiabilitiesAbstract_8777a92c-d74f-4e8c-a0a6-5378fe3e0387_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities:</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAbstract_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="lab_us-gaap_LiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets_3912db9f-7050-4793-9492-712b5098460c_terseLabel_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Held for Sale - Other Assets</link:label>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets_label_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule III Real Estate Held for Sale Other Assets</link:label>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets_documentation_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule III Real Estate Held for Sale Other Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:href="fr-20251231.xsd#fr_ScheduleIIIRealEstateHeldForSaleOtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:to="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixTwoOneThirtySeventhStreetNWMember_d30ee8c5-7960-438d-b0ec-c892e892391a_terseLabel_en-US" xlink:label="lab_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">621 37th Street NW</link:label>
    <link:label id="lab_fr_SixTwoOneThirtySeventhStreetNWMember_label_en-US" xlink:label="lab_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Two One Thirty Seventh Street NW [Member]</link:label>
    <link:label id="lab_fr_SixTwoOneThirtySeventhStreetNWMember_documentation_en-US" xlink:label="lab_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Two One Thirty Seventh Street NW</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:href="fr-20251231.xsd#fr_SixTwoOneThirtySeventhStreetNWMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:to="lab_fr_SixTwoOneThirtySeventhStreetNWMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DepreciationAndAmortization_50e4cb16-e5a0-4cfc-89f7-fe41f6645096_verboseLabel_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and Other Amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationAndAmortization_label_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization, Nonproduction</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepreciationAndAmortization" xlink:to="lab_us-gaap_DepreciationAndAmortization" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoWorldsFairDriveMember_f1489e27-697a-4bb7-9c9f-6f42a069f125_terseLabel_en-US" xlink:label="lab_fr_TwoTwoWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22 World's Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoTwoWorldsFairDriveMember_label_en-US" xlink:label="lab_fr_TwoTwoWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Worlds Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoTwoWorldsFairDriveMember_documentation_en-US" xlink:label="lab_fr_TwoTwoWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two two World's Fair Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoWorldsFairDriveMember" xlink:href="fr-20251231.xsd#fr_TwoTwoWorldsFairDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoWorldsFairDriveMember" xlink:to="lab_fr_TwoTwoWorldsFairDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember_7729176d-5c18-468d-b8d5-217ec92fd572_terseLabel_en-US" xlink:label="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">16500 W. 103rd Street [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember_label_en-US" xlink:label="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sixteen Thousand Five Hundred W One Hundred Three Rd Street [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember_documentation_en-US" xlink:label="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sixteen thousand five hundred W one hundred three rd Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:href="fr-20251231.xsd#fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:to="lab_fr_SixteenThousandFiveHundredWOneHundredThreeRdStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage_25372f16-a87d-4af9-b81e-0fa943fa4e42_terseLabel_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Interest Percentage</link:label>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage_label_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Interest Percentage</link:label>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage_documentation_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Interest Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:href="fr-20251231.xsd#fr_ConsolidatedJointVenturePartnershipInterestPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:to="lab_fr_ConsolidatedJointVenturePartnershipInterestPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateOtherDeductions_f1f8a19b-6c70-4795-a54e-a9c487826857_negatedLabel_en-US" xlink:label="lab_us-gaap_RealEstateOtherDeductions" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Write-off of Fully Depreciated and Other Assets</link:label>
    <link:label id="lab_us-gaap_RealEstateOtherDeductions_label_en-US" xlink:label="lab_us-gaap_RealEstateOtherDeductions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherDeductions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateOtherDeductions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateOtherDeductions" xlink:to="lab_us-gaap_RealEstateOtherDeductions" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorLineItems_8a1e2944-3c41-4ea1-a162-d35cd5473611_terseLabel_en-US" xlink:label="lab_dei_AuditorLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor [Line Items]</link:label>
    <link:label id="lab_dei_AuditorLineItems_label_en-US" xlink:label="lab_dei_AuditorLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLineItems" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorLineItems" xlink:to="lab_dei_AuditorLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThousandFiveHundredOneOaktonStreetMember_fcf38dc8-a125-4479-9190-3d6c89baf5d4_terseLabel_en-US" xlink:label="lab_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1501 Oakton Street [Member]</link:label>
    <link:label id="lab_fr_OneThousandFiveHundredOneOaktonStreetMember_label_en-US" xlink:label="lab_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Thousand Five Hundred One Oakton Street [Member]</link:label>
    <link:label id="lab_fr_OneThousandFiveHundredOneOaktonStreetMember_documentation_en-US" xlink:label="lab_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One thousand five hundred one Oakton Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:href="fr-20251231.xsd#fr_OneThousandFiveHundredOneOaktonStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:to="lab_fr_OneThousandFiveHundredOneOaktonStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_158d5ab8-e5e4-40a8-a931-5553023f1897_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:to="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourHundredOneRussellDriveMember_db0e48e6-a4d6-4830-af87-9ac3936166ee_terseLabel_en-US" xlink:label="lab_fr_FourHundredOneRussellDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">401 Russell Drive [Member]</link:label>
    <link:label id="lab_fr_FourHundredOneRussellDriveMember_label_en-US" xlink:label="lab_fr_FourHundredOneRussellDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Hundred One Russell Drive [Member]</link:label>
    <link:label id="lab_fr_FourHundredOneRussellDriveMember_documentation_en-US" xlink:label="lab_fr_FourHundredOneRussellDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four hundred one Russell Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourHundredOneRussellDriveMember" xlink:href="fr-20251231.xsd#fr_FourHundredOneRussellDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourHundredOneRussellDriveMember" xlink:to="lab_fr_FourHundredOneRussellDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_f3d849e1-08f1-460f-b720-a2c9e77c3ab4_terseLabel_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_CoSelectedMeasureAmt_terseLabel_en-US" xlink:label="lab_ecd_CoSelectedMeasureAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Company Selected Measure Amount</link:label>
    <link:label id="lab_ecd_CoSelectedMeasureAmt_label_en-US" xlink:label="lab_ecd_CoSelectedMeasureAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Company Selected Measure Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CoSelectedMeasureAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CoSelectedMeasureAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CoSelectedMeasureAmt" xlink:to="lab_ecd_CoSelectedMeasureAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_39b4ffce-5e2e-4219-8a20-9cb1bee00461_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_ce5183d7-be53-46e6-bcc5-5a97dcdb4cc7_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive Income Attributable to Common Stockholders/Unitholders</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_MeasureName_terseLabel_en-US" xlink:label="lab_ecd_MeasureName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name</link:label>
    <link:label id="lab_ecd_MeasureName_label_en-US" xlink:label="lab_ecd_MeasureName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measure Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MeasureName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_MeasureName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_MeasureName" xlink:to="lab_ecd_MeasureName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OtherRealEstatePartnershipMember_04ce90cb-578f-467a-a9ff-9d83f06871ed_terseLabel_en-US" xlink:label="lab_fr_OtherRealEstatePartnershipMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Real Estate Partnerships</link:label>
    <link:label id="lab_fr_OtherRealEstatePartnershipMember_label_en-US" xlink:label="lab_fr_OtherRealEstatePartnershipMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Real Estate Partnership [Member]</link:label>
    <link:label id="lab_fr_OtherRealEstatePartnershipMember_documentation_en-US" xlink:label="lab_fr_OtherRealEstatePartnershipMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other real estate partnership.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OtherRealEstatePartnershipMember" xlink:href="fr-20251231.xsd#fr_OtherRealEstatePartnershipMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OtherRealEstatePartnershipMember" xlink:to="lab_fr_OtherRealEstatePartnershipMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroNineTwoZeroSteeleStreetMember_c76051a2-82b1-4911-bbfc-cf73bf2c4405_terseLabel_en-US" xlink:label="lab_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10920 Steele Street</link:label>
    <link:label id="lab_fr_OneZeroNineTwoZeroSteeleStreetMember_label_en-US" xlink:label="lab_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Nine Two Zero Steele Street [Member]</link:label>
    <link:label id="lab_fr_OneZeroNineTwoZeroSteeleStreetMember_documentation_en-US" xlink:label="lab_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero Nine Two Zero Steele Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:href="fr-20251231.xsd#fr_OneZeroNineTwoZeroSteeleStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:to="lab_fr_OneZeroNineTwoZeroSteeleStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ClassOfStockLineItems_24628698-a0e3-4860-b1d1-6a304f1c8509_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Line Items]</link:label>
    <link:label id="lab_us-gaap_ClassOfStockLineItems_label_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockLineItems" xlink:to="lab_us-gaap_ClassOfStockLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember_e139a047-23fe-4928-8b74-f50d9e856f8e_terseLabel_en-US" xlink:label="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4526 N Sam Houston Parkway</link:label>
    <link:label id="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember_label_en-US" xlink:label="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Five Two Six N Sam Houston Parkway [Member]</link:label>
    <link:label id="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember_documentation_en-US" xlink:label="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Five Two Six N Sam Houston Parkway</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:href="fr-20251231.xsd#fr_FourFiveTwoSixNSamHoustonParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:to="lab_fr_FourFiveTwoSixNSamHoustonParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UnsecuredDebtMember_1df1ea93-42fd-4599-9730-2b0afb5e5b60_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebtMember_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Debt [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebtMember" xlink:to="lab_us-gaap_UnsecuredDebtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssets_e679ce0c-e0eb-4bfe-87dd-fa2bb1645539_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssets" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssets_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssets" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OffMarketFavorableLeaseMember_96b41250-14c8-410e-82b7-3cada56f3759_terseLabel_en-US" xlink:label="lab_us-gaap_OffMarketFavorableLeaseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below Market Leases</link:label>
    <link:label id="lab_us-gaap_OffMarketFavorableLeaseMember_label_en-US" xlink:label="lab_us-gaap_OffMarketFavorableLeaseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Off-Market Favorable Lease [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffMarketFavorableLeaseMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OffMarketFavorableLeaseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OffMarketFavorableLeaseMember" xlink:to="lab_us-gaap_OffMarketFavorableLeaseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember_c63304d9-a6cc-4f3a-be64-e01b6e8d4889_terseLabel_en-US" xlink:label="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8000 E. 96th Avenue</link:label>
    <link:label id="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember_label_en-US" xlink:label="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero Zero Zero E Ninetysixth Avenue [Member]</link:label>
    <link:label id="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember_documentation_en-US" xlink:label="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Zero Zero Zero E Ninetysixth Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:href="fr-20251231.xsd#fr_EightZeroZeroZeroENinetysixthAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:to="lab_fr_EightZeroZeroZeroENinetysixthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember_a6e2886d-4b6b-45f4-84e1-f70839a1e516_terseLabel_en-US" xlink:label="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11253 Redwood Avenue [Member]</link:label>
    <link:label id="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember_label_en-US" xlink:label="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Two Five Three Redwood Avenue [Member]</link:label>
    <link:label id="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember_documentation_en-US" xlink:label="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Two Five Three Redwood Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:href="fr-20251231.xsd#fr_OneOneTwoFiveThreeRedwoodAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:to="lab_fr_OneOneTwoFiveThreeRedwoodAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebt_5354665f-80be-4059-9935-c7d7774de885_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_label_en-US" xlink:label="lab_us-gaap_LongTermDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt" xlink:to="lab_us-gaap_LongTermDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LegalEntityAxis_20352ded-8acb-4be8-bd73-7278de5ec23d_terseLabel_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:label id="lab_dei_LegalEntityAxis_label_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LegalEntityAxis" xlink:to="lab_dei_LegalEntityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Assets_dd3bac5e-2948-4332-9aa0-4a1e61c685dd_totalLabel_en-US" xlink:label="lab_us-gaap_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Assets</link:label>
    <link:label id="lab_us-gaap_Assets_label_en-US" xlink:label="lab_us-gaap_Assets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets" xlink:to="lab_us-gaap_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage_27f21630-578c-491b-bffb-7eacdcc44f74_terseLabel_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Partner Interest Percentage</link:label>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage_label_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Partner Interest Percentage</link:label>
    <link:label id="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage_documentation_en-US" xlink:label="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Consolidated Joint Venture Partnership, Partner Interest Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:href="fr-20251231.xsd#fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:to="lab_fr_ConsolidatedJointVenturePartnershipPartnerInterestPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_038567d2-db34-4a9f-9583-581fa2271f42_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveEightEightFiveStapletonDriveNorthMember_fe59a17f-d070-41b9-aba8-13796c4188f1_terseLabel_en-US" xlink:label="lab_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5885 Stapleton Drive North [Member]</link:label>
    <link:label id="lab_fr_FiveEightEightFiveStapletonDriveNorthMember_label_en-US" xlink:label="lab_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Eight Eight Five Stapleton Drive North [Member]</link:label>
    <link:label id="lab_fr_FiveEightEightFiveStapletonDriveNorthMember_documentation_en-US" xlink:label="lab_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Eight Eight Five Stapleton Drive North.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:href="fr-20251231.xsd#fr_FiveEightEightFiveStapletonDriveNorthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:to="lab_fr_FiveEightEightFiveStapletonDriveNorthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_5185cd0a-a017-4a13-9c35-77312b6451cb_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested, Weighted Average Grant Date Fair Value</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateTable_86823be3-4816-4c8a-a61b-c5e9117215eb_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate [Table]</link:label>
    <link:label id="lab_us-gaap_RealEstateTable_label_en-US" xlink:label="lab_us-gaap_RealEstateTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateTable" xlink:to="lab_us-gaap_RealEstateTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_1c828db7-4c62-4474-ae26-d65e7065d851_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:to="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ManagementMember_a3654aea-6013-40ea-9744-8aea597f8cff_terseLabel_en-US" xlink:label="lab_srt_ManagementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Management</link:label>
    <link:label id="lab_srt_ManagementMember_label_en-US" xlink:label="lab_srt_ManagementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Management [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ManagementMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ManagementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ManagementMember" xlink:to="lab_srt_ManagementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember_8a7b980f-95f5-4fb9-86fe-b6d8d46e1226_terseLabel_en-US" xlink:label="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">12055 E 49th Ave/4955 Peoria [Member]</link:label>
    <link:label id="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember_label_en-US" xlink:label="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Twelve Thousand Fifty Five E Forty Nine Th Ave By Four Thousand Nine Hundred Fifty Five Peoria [Member]</link:label>
    <link:label id="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember_documentation_en-US" xlink:label="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Twelve thousand fifty five E forty nine th Ave by four thousand nine hundred fifty five Peoria.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:href="fr-20251231.xsd#fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:to="lab_fr_TwelveThousandFiftyFiveEFortyNineThAveByFourThousandNineHundredFiftyFivePeoriaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnersCapital_a65e4fd5-f4fc-47e6-ba40-17aa915147e6_totalLabel_en-US" xlink:label="lab_us-gaap_PartnersCapital" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total First Industrial, L.P.'s Partners' Capital</link:label>
    <link:label id="lab_us-gaap_PartnersCapital_930227b6-574f-47b8-b27d-04f63fb9b2cc_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Partners' Capital</link:label>
    <link:label id="lab_us-gaap_PartnersCapital_label_en-US" xlink:label="lab_us-gaap_PartnersCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapital" xlink:to="lab_us-gaap_PartnersCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_1fb0d0b4-1d1f-4fbd-acfb-67c9c7e46feb_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPolicyTextBlock" xlink:to="lab_us-gaap_IncomeTaxPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourWorldsFairDriveMember_157d832e-92dc-45f6-979d-7afea1fc9e4a_terseLabel_en-US" xlink:label="lab_fr_TwoFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24 World's Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFourWorldsFairDriveMember_label_en-US" xlink:label="lab_fr_TwoFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Worlds Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoFourWorldsFairDriveMember_documentation_en-US" xlink:label="lab_fr_TwoFourWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two four World's Fair Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourWorldsFairDriveMember" xlink:href="fr-20251231.xsd#fr_TwoFourWorldsFairDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourWorldsFairDriveMember" xlink:to="lab_fr_TwoFourWorldsFairDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeZeroOneCenturyCircleMember_a0f35214-41e7-407f-bb77-d7d3263b9c96_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3301 Century Circle [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeZeroOneCenturyCircleMember_label_en-US" xlink:label="lab_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Zero One Century Circle [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeZeroOneCenturyCircleMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Three Zero One Century Circle.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeZeroOneCenturyCircleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:to="lab_fr_ThreeThreeZeroOneCenturyCircleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightHundredBusinessCenterDriveMember_72bed71d-3c6e-4998-a51c-bb36eb2bdba1_terseLabel_en-US" xlink:label="lab_fr_EightHundredBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">800 Business Drive [Member]</link:label>
    <link:label id="lab_fr_EightHundredBusinessCenterDriveMember_label_en-US" xlink:label="lab_fr_EightHundredBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Hundred Business Center Drive [Member]</link:label>
    <link:label id="lab_fr_EightHundredBusinessCenterDriveMember_documentation_en-US" xlink:label="lab_fr_EightHundredBusinessCenterDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight hundred business Center Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightHundredBusinessCenterDriveMember" xlink:href="fr-20251231.xsd#fr_EightHundredBusinessCenterDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightHundredBusinessCenterDriveMember" xlink:to="lab_fr_EightHundredBusinessCenterDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_a67ae046-f7ce-452a-8976-7c5e689cadd4_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH FLOWS FROM OPERATING ACTIVITIES:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember_111c3ff8-54b5-4be2-a59c-d4cd0fd6a8f8_terseLabel_en-US" xlink:label="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2335 Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember_label_en-US" xlink:label="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Three Three Five Camino Vida Roble [Member]</link:label>
    <link:label id="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember_documentation_en-US" xlink:label="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two three three five Camino Vida Roble.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:href="fr-20251231.xsd#fr_TwoThreeThreeFiveCaminoVidaRobleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:to="lab_fr_TwoThreeThreeFiveCaminoVidaRobleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense_b0992e2f-b154-4c55-acc2-53f3e523c5e6_terseLabel_en-US" xlink:label="lab_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation for Year</link:label>
    <link:label id="lab_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense_label_en-US" xlink:label="lab_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense" xlink:to="lab_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_6ac6de1a-6a10-47c9-a715-0209268d476b_periodStartLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance, Beginning of Year</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_0f94369e-9a73-4589-8036-bada59f4b6e9_periodEndLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance, End of Year Including Real Estate Held for Sale</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, at Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateInvestmentPropertyAtCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:to="lab_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnersCapitalAccountDistributions_bfe5a38e-a507-465d-8188-a9e547d66b0f_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountDistributions" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unit Distributions</link:label>
    <link:label id="lab_us-gaap_PartnersCapitalAccountDistributions_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountDistributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital Account, Distributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalAccountDistributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalAccountDistributions" xlink:to="lab_us-gaap_PartnersCapitalAccountDistributions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourFiveW.134thStreetMember_64f2a3cc-5112-48b3-9153-0ce10e5c2ca5_terseLabel_en-US" xlink:label="lab_fr_OneFourFiveW.134thStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">145 West 134th Street [Member]</link:label>
    <link:label id="lab_fr_OneFourFiveW.134thStreetMember_label_en-US" xlink:label="lab_fr_OneFourFiveW.134thStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Five W. 134th Street [Member]</link:label>
    <link:label id="lab_fr_OneFourFiveW.134thStreetMember_documentation_en-US" xlink:label="lab_fr_OneFourFiveW.134thStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Five W. 134th Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourFiveW.134thStreetMember" xlink:href="fr-20251231.xsd#fr_OneFourFiveW.134thStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourFiveW.134thStreetMember" xlink:to="lab_fr_OneFourFiveW.134thStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_WriteOffOfFullyDepreciatedAssets_b4d9c452-4302-4579-bf2f-2123a9661cbb_negatedTerseLabel_en-US" xlink:label="lab_fr_WriteOffOfFullyDepreciatedAssets" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Write-off of Fully Depreciated Assets</link:label>
    <link:label id="lab_fr_WriteOffOfFullyDepreciatedAssets_label_en-US" xlink:label="lab_fr_WriteOffOfFullyDepreciatedAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Write Off Of Fully Depreciated Assets</link:label>
    <link:label id="lab_fr_WriteOffOfFullyDepreciatedAssets_documentation_en-US" xlink:label="lab_fr_WriteOffOfFullyDepreciatedAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The non-cash amount of fully depreciated assets being written off during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_WriteOffOfFullyDepreciatedAssets" xlink:href="fr-20251231.xsd#fr_WriteOffOfFullyDepreciatedAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_WriteOffOfFullyDepreciatedAssets" xlink:to="lab_fr_WriteOffOfFullyDepreciatedAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GeneralPartnerMember_8f0ba772-1bd2-4a42-87c1-5badcb4081bf_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnerMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">General Partner Units</link:label>
    <link:label id="lab_us-gaap_GeneralPartnerMember_label_en-US" xlink:label="lab_us-gaap_GeneralPartnerMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General Partner [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnerMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralPartnerMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralPartnerMember" xlink:to="lab_us-gaap_GeneralPartnerMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_d8792ebc-d358-4709-85cd-b6a3125dcb49_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityLineItems" xlink:to="lab_us-gaap_VariableInterestEntityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ea5eed60-282d-4094-9c62-29f2e71a6b44_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_0ff26b27-3ea2-4bd4-af01-e406313c683e_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends/Distributions Per Share/Unit</link:label>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_label_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Dividends, Per Share, Declared</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockDividendsPerShareDeclared" xlink:to="lab_us-gaap_CommonStockDividendsPerShareDeclared" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_81ed5a86-8d65-4001-9173-b5c9f2268d2b_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding" xlink:to="lab_dei_EntityCommonStockSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoTwoBordnersvilleRoadMember_fac44276-a6bb-4600-995c-a0f14b07874f_terseLabel_en-US" xlink:label="lab_fr_OneTwoTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">122 Bordnersville Road [Member]</link:label>
    <link:label id="lab_fr_OneTwoTwoBordnersvilleRoadMember_label_en-US" xlink:label="lab_fr_OneTwoTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Two Bordnersville Road [Member]</link:label>
    <link:label id="lab_fr_OneTwoTwoBordnersvilleRoadMember_documentation_en-US" xlink:label="lab_fr_OneTwoTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Two Bordnersville Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoTwoBordnersvilleRoadMember" xlink:href="fr-20251231.xsd#fr_OneTwoTwoBordnersvilleRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoTwoBordnersvilleRoadMember" xlink:to="lab_fr_OneTwoTwoBordnersvilleRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_d976886d-74e2-4921-975c-9273e01e0d03_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets</link:label>
    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:to="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_0c8abaae-2783-4477-9efc-076e865be25b_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant Other Observable Inputs (Level 2)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel2Member" xlink:to="lab_us-gaap_FairValueInputsLevel2Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFinStmtErrorCorrectionFlag_ec14190b-407d-4c13-8c23-44a56355190a_terseLabel_en-US" xlink:label="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Financial Statement Error Correction [Flag]</link:label>
    <link:label id="lab_dei_DocumentFinStmtErrorCorrectionFlag_label_en-US" xlink:label="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Financial Statement Error Correction [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFinStmtErrorCorrectionFlag" xlink:to="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock_terseLabel_en-US" xlink:label="lab_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insider Trading Policies and Procedures Not Adopted</link:label>
    <link:label id="lab_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock_label_en-US" xlink:label="lab_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insider Trading Policies and Procedures Not Adopted [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:to="lab_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy_3277ef88-b5f5-4c04-85b2-cb7d96aeb88f_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on Sale of Real Estate</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Real Estate Transactions, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionRealEstateTransactionsPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy" xlink:to="lab_us-gaap_RevenueRecognitionRealEstateTransactionsPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_73688e43-2e17-47c0-8f76-939314c59040_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on Sale of Real Estate</link:label>
    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_label_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:to="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_62c7a8af-5b98-42e4-a497-82e1f886ced9_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payment, Due [Abstract]</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:to="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember_5ff6c40a-f87c-4ee8-8a88-8b0958c1e537_terseLabel_en-US" xlink:label="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10780 Redwood Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember_label_en-US" xlink:label="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Seven Eight Zero Redwood Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember_documentation_en-US" xlink:label="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero Seven Eight Zero Redwood Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:href="fr-20251231.xsd#fr_OneZeroSevenEightZeroRedwoodAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:to="lab_fr_OneZeroSevenEightZeroRedwoodAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_DispositionActivityMember_d04d6d45-3105-4c8b-9eb4-b54900c5534b_terseLabel_en-US" xlink:label="lab_fr_DispositionActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposition Activity</link:label>
    <link:label id="lab_fr_DispositionActivityMember_label_en-US" xlink:label="lab_fr_DispositionActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposition Activity [Member]</link:label>
    <link:label id="lab_fr_DispositionActivityMember_documentation_en-US" xlink:label="lab_fr_DispositionActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disposition Activity [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_DispositionActivityMember" xlink:href="fr-20251231.xsd#fr_DispositionActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_DispositionActivityMember" xlink:to="lab_fr_DispositionActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_d45250bd-1aef-4fd5-8334-3a3da87bf7c3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Income Tax (Provision) Benefit</link:label>
    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember_6dbf55fd-069f-4ba6-9b2b-fc1dba448a7c_terseLabel_en-US" xlink:label="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7105 Old 215 Frontage Road [Member]</link:label>
    <link:label id="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember_label_en-US" xlink:label="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven One Zero Five Old Two Fifteen Frontage Road [Member]</link:label>
    <link:label id="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember_documentation_en-US" xlink:label="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven One Zero Five Old Two Fifteen Frontage Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:href="fr-20251231.xsd#fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:to="lab_fr_SevenOneZeroFiveOldTwoFifteenFrontageRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_52e2d4a6-540e-4ffd-ab04-020a3a5ffac8_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Real Estate and Depreciation</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember_031d33c7-c511-45ee-b45b-76309268af00_terseLabel_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9500 West 49th Street - D [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember_label_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street D [Member]</link:label>
    <link:label id="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember_documentation_en-US" xlink:label="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Five Zero Zero West Four Ninth Street D.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:href="fr-20251231.xsd#fr_NineFiveZeroZeroWestFourNinthStreetDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:to="lab_fr_NineFiveZeroZeroWestFourNinthStreetDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CustomerAdvancesAndDeposits_4ea63587-899d-4e91-b026-6e2494e913cb_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesAndDeposits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rents Received in Advance and Security Deposits</link:label>
    <link:label id="lab_us-gaap_CustomerAdvancesAndDeposits_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesAndDeposits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Advances and Deposits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerAdvancesAndDeposits" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerAdvancesAndDeposits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CustomerAdvancesAndDeposits" xlink:to="lab_us-gaap_CustomerAdvancesAndDeposits" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationTable_0a8dd54a-c4b6-477b-943e-7be5dc6f5735_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
    <link:label id="lab_dei_DocumentInformationTable_label_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentInformationTable" xlink:to="lab_dei_DocumentInformationTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeoMember_terseLabel_en-US" xlink:label="lab_ecd_PeoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PEO</link:label>
    <link:label id="lab_ecd_PeoMember_label_en-US" xlink:label="lab_ecd_PeoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PEO [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeoMember" xlink:to="lab_ecd_PeoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenEightTwoFiveIndianStreetMember_54c0a2f5-f39a-44e1-8255-be46a30e49c6_terseLabel_en-US" xlink:label="lab_fr_OneSevenEightTwoFiveIndianStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">17825 Indian Street [Member]</link:label>
    <link:label id="lab_fr_OneSevenEightTwoFiveIndianStreetMember_label_en-US" xlink:label="lab_fr_OneSevenEightTwoFiveIndianStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Eight Two Five Indian Street [Member]</link:label>
    <link:label id="lab_fr_OneSevenEightTwoFiveIndianStreetMember_documentation_en-US" xlink:label="lab_fr_OneSevenEightTwoFiveIndianStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Seven Eight Two Five Indian Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenEightTwoFiveIndianStreetMember" xlink:href="fr-20251231.xsd#fr_OneSevenEightTwoFiveIndianStreetMember"/>
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    <link:loc xlink:type="locator" xlink:label="loc_fr_SixEightZeroColumbiaAvenueMember" xlink:href="fr-20251231.xsd#fr_SixEightZeroColumbiaAvenueMember"/>
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    <link:label id="lab_fr_OneNineFourFourVistaBellaWayMember_2b96948a-7340-4ac2-ae55-e57de2842a97_terseLabel_en-US" xlink:label="lab_fr_OneNineFourFourVistaBellaWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1944 Vista Bella Way [Member]</link:label>
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    <link:label id="lab_fr_OneNineFourFourVistaBellaWayMember_documentation_en-US" xlink:label="lab_fr_OneNineFourFourVistaBellaWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine four four Vista Bella Way.</link:label>
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    <link:label id="lab_fr_OneThreeTwoTwoSixSixNCarrierParkwayEMember_b4317ad5-15dc-4ead-92e9-4be1e60b4feb_terseLabel_en-US" xlink:label="lab_fr_OneThreeTwoTwoSixSixNCarrierParkwayEMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1322-66 W. North Carrier Parkway [Member]</link:label>
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    <link:label id="lab_fr_OneThreeTwoTwoSixSixNCarrierParkwayEMember_documentation_en-US" xlink:label="lab_fr_OneThreeTwoTwoSixSixNCarrierParkwayEMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Two Two Six Six N Carrier Parkway e.</link:label>
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    <link:label id="lab_fr_SixFourZeroSevenSTwoOneZeroTHStreetMember_82ded050-15dd-4e1c-8097-48e153e827fb_terseLabel_en-US" xlink:label="lab_fr_SixFourZeroSevenSTwoOneZeroTHStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6407 S 210th Street [Member]</link:label>
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    <link:label id="lab_fr_AtmMember_d32ce30b-655a-435d-810b-2e88c397447b_terseLabel_en-US" xlink:label="lab_fr_AtmMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ATM [Member]</link:label>
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    <link:label id="lab_fr_AtmMember_documentation_en-US" xlink:label="lab_fr_AtmMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ATM.</link:label>
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    <link:label id="lab_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent_6634fdc5-e85e-4ed2-8183-550f29ed8287_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-Term Construction Loan</link:label>
    <link:label id="lab_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Construction Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermConstructionLoanCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent" xlink:to="lab_us-gaap_LongtermConstructionLoanCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LandImprovementsMember_f97030d7-06ae-475d-92f6-caad3ad03795_terseLabel_en-US" xlink:label="lab_us-gaap_LandImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land Improvements</link:label>
    <link:label id="lab_us-gaap_LandImprovementsMember_label_en-US" xlink:label="lab_us-gaap_LandImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land Improvements [Member]</link:label>
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    <link:label id="lab_fr_MinimumPercentageOfTaxableIncomeToBeDistributed_label_en-US" xlink:label="lab_fr_MinimumPercentageOfTaxableIncomeToBeDistributed" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Percentage Of Taxable Income To Be Distributed</link:label>
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    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineNotesMember_4e66fdd1-a899-4caa-bbf8-1cb0e28cf4a9_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandTwentyNineNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029 Private Placement Notes</link:label>
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    <link:label id="lab_us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue_f8fa5985-ca9e-4b55-9bb2-fe37e2aec367_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash Flow Hedge Derivative Instrument Liabilities at Fair Value</link:label>
    <link:label id="lab_us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue_label_en-US" xlink:label="lab_us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow Hedge Derivative Instrument Liabilities at Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue"/>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_23a1ce54-2b5f-4186-a259-314aef1cdbeb_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected volatility - range used</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_43fdd1c5-849d-4a80-9dd2-a23728aefb22_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents and Restricted Cash, Beginning of Year</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_c1b1c225-5283-4dcf-b91f-62fde0c03b2f_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents and Restricted Cash, End of Year</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeStatementAbstract_7d1d5b14-52d2-4077-9864-f171b21dfd4c_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementAbstract_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="lab_us-gaap_IncomeStatementAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember_7e04b9a0-f63e-45dc-b2a2-83fda578bfa7_terseLabel_en-US" xlink:label="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7240-7248 Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember_label_en-US" xlink:label="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Two Four Zero To Seven Two Four Eight Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember_documentation_en-US" xlink:label="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7240-7248 Wynnwood.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:href="fr-20251231.xsd#fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:to="lab_fr_SevenTwoFourZeroToSevenTwoFourEightWynnwoodMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SaleOfStockNameOfTransactionDomain_03f0d13e-d6c5-4e3f-a633-255e7e00c4ef_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockNameOfTransactionDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of Stock [Domain]</link:label>
    <link:label id="lab_us-gaap_SaleOfStockNameOfTransactionDomain_label_en-US" xlink:label="lab_us-gaap_SaleOfStockNameOfTransactionDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale of Stock [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="lab_us-gaap_SaleOfStockNameOfTransactionDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AboveMarketLeasesMember_fa773cbc-187b-4f59-89cc-90becf2a325e_terseLabel_en-US" xlink:label="lab_us-gaap_AboveMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Above Market Leases</link:label>
    <link:label id="lab_us-gaap_AboveMarketLeasesMember_label_en-US" xlink:label="lab_us-gaap_AboveMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Above Market Leases [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AboveMarketLeasesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AboveMarketLeasesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AboveMarketLeasesMember" xlink:to="lab_us-gaap_AboveMarketLeasesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveZeroFiveZeroCampbellRoadMember_f0b196eb-0e7a-4dac-ba98-ebf97a978410_terseLabel_en-US" xlink:label="lab_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5050 Campbell Road [Member]</link:label>
    <link:label id="lab_fr_FiveZeroFiveZeroCampbellRoadMember_label_en-US" xlink:label="lab_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Zero Five Zero Campbell Road [Member]</link:label>
    <link:label id="lab_fr_FiveZeroFiveZeroCampbellRoadMember_documentation_en-US" xlink:label="lab_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five zero five zero Campbell Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:href="fr-20251231.xsd#fr_FiveZeroFiveZeroCampbellRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:to="lab_fr_FiveZeroFiveZeroCampbellRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSixSevenNineWestLudlowDriveMember_01eb8119-999c-4528-ab43-6850f9341170_terseLabel_en-US" xlink:label="lab_fr_EightSixSevenNineWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8679 West Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSixSevenNineWestLudlowDriveMember_label_en-US" xlink:label="lab_fr_EightSixSevenNineWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Six Seven Nine West Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSixSevenNineWestLudlowDriveMember_documentation_en-US" xlink:label="lab_fr_EightSixSevenNineWestLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Six Seven Nine West Ludlow Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSixSevenNineWestLudlowDriveMember" xlink:href="fr-20251231.xsd#fr_EightSixSevenNineWestLudlowDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSixSevenNineWestLudlowDriveMember" xlink:to="lab_fr_EightSixSevenNineWestLudlowDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestExpenseDebtExcludingAmortization_9014d1ff-4627-4d56-bcf9-1f1eb7d7e0cc_negatedLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebtExcludingAmortization" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebtExcludingAmortization_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebtExcludingAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Debt, Excluding Amortization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseDebtExcludingAmortization" xlink:to="lab_us-gaap_InterestExpenseDebtExcludingAmortization" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember_019c489d-61d2-737e-8358-c09adcf119cb_terseLabel_en-US" xlink:label="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8901 NW 87th Avenue</link:label>
    <link:label id="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember_label_en-US" xlink:label="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Nine Zero One NW Eighty Seventh Avenue [Member]</link:label>
    <link:label id="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember_documentation_en-US" xlink:label="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Nine Zero One NW Eighty Seventh Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:href="fr-20251231.xsd#fr_EightNineZeroOneNWEightySeventhAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:to="lab_fr_EightNineZeroOneNWEightySeventhAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProfitLoss_e67fa924-4dfb-440f-b0e5-744dcadf6456_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Income</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_93fa3e05-62e6-4193-8b29-fdc1c6f69d22_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Income</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_69ebdfb0-fbc5-45ba-901e-51982819a22b_verboseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net Income</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_label_en-US" xlink:label="lab_us-gaap_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss" xlink:to="lab_us-gaap_ProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_11f8418f-f0f5-4d6f-a18b-7ea48c0cb03a_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_RestatementDoesNotRequireRecoveryTextBlock_terseLabel_en-US" xlink:label="lab_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restatement does not require Recovery</link:label>
    <link:label id="lab_ecd_RestatementDoesNotRequireRecoveryTextBlock_label_en-US" xlink:label="lab_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restatement Does Not Require Recovery [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_RestatementDoesNotRequireRecoveryTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:to="lab_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember_d7f8a0e3-b943-4d1f-941e-59ba187afda6_terseLabel_en-US" xlink:label="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4940 - 4950 Paris [Member]</link:label>
    <link:label id="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember_label_en-US" xlink:label="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thousand Nine Hundred Forty And Four Thousand Nine Hundred Fifty Paris [Member]</link:label>
    <link:label id="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember_documentation_en-US" xlink:label="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four thousand nine hundred forty and four thousand nine hundred fifty Paris.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:href="fr-20251231.xsd#fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:to="lab_fr_FourThousandNineHundredFortyAndFourThousandNineHundredFiftyParisMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroFiveOneMidwayRoadMember_a11abe7b-9711-4857-a017-0d5af081d182_terseLabel_en-US" xlink:label="lab_fr_TwoZeroFiveOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2051 Midway Road</link:label>
    <link:label id="lab_fr_TwoZeroFiveOneMidwayRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroFiveOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Five One Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroFiveOneMidwayRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroFiveOneMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Five One Midway Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroFiveOneMidwayRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroFiveOneMidwayRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroFiveOneMidwayRoadMember" xlink:to="lab_fr_TwoZeroFiveOneMidwayRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeNotionalAmount_876675ac-8985-49ae-9258-8b40db45cedd_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNotionalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative, Notional Amount</link:label>
    <link:label id="lab_us-gaap_DerivativeNotionalAmount_label_en-US" xlink:label="lab_us-gaap_DerivativeNotionalAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Notional Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeNotionalAmount" xlink:to="lab_us-gaap_DerivativeNotionalAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PurchasePriceOfIncomeProducingLand_cad63d4f-eda3-40de-ad7d-46e5c28054ee_terseLabel_en-US" xlink:label="lab_fr_PurchasePriceOfIncomeProducingLand" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase Price of Income Producing Land</link:label>
    <link:label id="lab_fr_PurchasePriceOfIncomeProducingLand_label_en-US" xlink:label="lab_fr_PurchasePriceOfIncomeProducingLand" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price of Income Producing Land</link:label>
    <link:label id="lab_fr_PurchasePriceOfIncomeProducingLand_documentation_en-US" xlink:label="lab_fr_PurchasePriceOfIncomeProducingLand" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase Price of Income Producing Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PurchasePriceOfIncomeProducingLand" xlink:href="fr-20251231.xsd#fr_PurchasePriceOfIncomeProducingLand"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PurchasePriceOfIncomeProducingLand" xlink:to="lab_fr_PurchasePriceOfIncomeProducingLand" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_126e4818-f344-4684-bea4-2b5cfa13a1a9_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightOneFiveTurningBasinDrMember_6409d86e-a127-449f-8d3f-5a7d3181202b_terseLabel_en-US" xlink:label="lab_fr_OneEightOneFiveTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1815 Turning Basin Dr [Member]</link:label>
    <link:label id="lab_fr_OneEightOneFiveTurningBasinDrMember_label_en-US" xlink:label="lab_fr_OneEightOneFiveTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight One Five Turning Basin Dr [Member]</link:label>
    <link:label id="lab_fr_OneEightOneFiveTurningBasinDrMember_documentation_en-US" xlink:label="lab_fr_OneEightOneFiveTurningBasinDrMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight one five Turning Basin Dr.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightOneFiveTurningBasinDrMember" xlink:href="fr-20251231.xsd#fr_OneEightOneFiveTurningBasinDrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightOneFiveTurningBasinDrMember" xlink:to="lab_fr_OneEightOneFiveTurningBasinDrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThreeThreeAlaskaAvenueMember_ea26af08-4215-4758-805f-b188ff69e9aa_terseLabel_en-US" xlink:label="lab_fr_FourThreeThreeAlaskaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">433 Alaska Avenue [Member]</link:label>
    <link:label id="lab_fr_FourThreeThreeAlaskaAvenueMember_label_en-US" xlink:label="lab_fr_FourThreeThreeAlaskaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Three Three Alaska Avenue [Member]</link:label>
    <link:label id="lab_fr_FourThreeThreeAlaskaAvenueMember_documentation_en-US" xlink:label="lab_fr_FourThreeThreeAlaskaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four three three Alaska Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThreeThreeAlaskaAvenueMember" xlink:href="fr-20251231.xsd#fr_FourThreeThreeAlaskaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThreeThreeAlaskaAvenueMember" xlink:to="lab_fr_FourThreeThreeAlaskaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourNineZeroNineSummitDriveMember_8211db02-5cd8-4523-a747-63fad2468307_terseLabel_en-US" xlink:label="lab_fr_OneFourNineZeroNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14909 Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineZeroNineSummitDriveMember_label_en-US" xlink:label="lab_fr_OneFourNineZeroNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Nine Zero Nine Summit Drive [Member]</link:label>
    <link:label id="lab_fr_OneFourNineZeroNineSummitDriveMember_documentation_en-US" xlink:label="lab_fr_OneFourNineZeroNineSummitDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Nine Zero Nine Summit Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourNineZeroNineSummitDriveMember" xlink:href="fr-20251231.xsd#fr_OneFourNineZeroNineSummitDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourNineZeroNineSummitDriveMember" xlink:to="lab_fr_OneFourNineZeroNineSummitDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember_44c32c65-0180-423b-aac6-2e749aaab386_terseLabel_en-US" xlink:label="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7230-7238 Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember_label_en-US" xlink:label="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Two Three Zero To Seven Two Three Eight Wynnwood [Member]</link:label>
    <link:label id="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember_documentation_en-US" xlink:label="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7230-7238 Wynnwood.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:href="fr-20251231.xsd#fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:to="lab_fr_SevenTwoThreeZeroToSevenTwoThreeEightWynnwoodMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwap2022SwapsMember_4f510adf-4c59-4da9-8edd-042487da2840_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 Swaps</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsMember_label_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsMember_documentation_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwap2022SwapsMember" xlink:href="fr-20251231.xsd#fr_InterestRateSwap2022SwapsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwap2022SwapsMember" xlink:to="lab_fr_InterestRateSwap2022SwapsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CityAreaCode_8f144179-d1f4-4204-81ff-d0ce3003ebfc_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:label id="lab_dei_CityAreaCode_label_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode" xlink:to="lab_dei_CityAreaCode" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PlanoCrossingBus.ParkMember_8ed57ae5-d505-4336-9848-410ae95215ef_terseLabel_en-US" xlink:label="lab_fr_PlanoCrossingBus.ParkMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plano Crossing Bus. Park [Member]</link:label>
    <link:label id="lab_fr_PlanoCrossingBus.ParkMember_label_en-US" xlink:label="lab_fr_PlanoCrossingBus.ParkMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plano Crossing Bus. Park [Member]</link:label>
    <link:label id="lab_fr_PlanoCrossingBus.ParkMember_documentation_en-US" xlink:label="lab_fr_PlanoCrossingBus.ParkMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plano Crossing Bus. Park</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PlanoCrossingBus.ParkMember" xlink:href="fr-20251231.xsd#fr_PlanoCrossingBus.ParkMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PlanoCrossingBus.ParkMember" xlink:to="lab_fr_PlanoCrossingBus.ParkMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardTmgHowMnpiCnsdrdTextBlock_terseLabel_en-US" xlink:label="lab_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Timing, How MNPI Considered</link:label>
    <link:label id="lab_ecd_AwardTmgHowMnpiCnsdrdTextBlock_label_en-US" xlink:label="lab_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Timing, How MNPI Considered [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardTmgHowMnpiCnsdrdTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:to="lab_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember_e1d38c1e-eace-4ae1-84e5-4f6a77b5ded9_terseLabel_en-US" xlink:label="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">901-937 Heinz Way [Member]</link:label>
    <link:label id="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember_label_en-US" xlink:label="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Zero One Nine Three Seven Heinz Way [Member]</link:label>
    <link:label id="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember_documentation_en-US" xlink:label="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Zero One Nine Three Seven Heinz Way.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:href="fr-20251231.xsd#fr_NineZeroOneNineThreeSevenHeinzWayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:to="lab_fr_NineZeroOneNineThreeSevenHeinzWayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MortgagesMember_577dcca1-ca2d-44a9-9ba9-1817b64d8455_terseLabel_en-US" xlink:label="lab_us-gaap_MortgagesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage Loan Payable</link:label>
    <link:label id="lab_us-gaap_MortgagesMember_label_en-US" xlink:label="lab_us-gaap_MortgagesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgages [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgagesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MortgagesMember" xlink:to="lab_us-gaap_MortgagesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_CapitalGainPerShare_590995e6-1c2c-4d51-9cdf-7aba3801d152_terseLabel_en-US" xlink:label="lab_fr_CapitalGainPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Capital Gain (B)</link:label>
    <link:label id="lab_fr_CapitalGainPerShare_label_en-US" xlink:label="lab_fr_CapitalGainPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Gain Per Share</link:label>
    <link:label id="lab_fr_CapitalGainPerShare_documentation_en-US" xlink:label="lab_fr_CapitalGainPerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Gain Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_CapitalGainPerShare" xlink:href="fr-20251231.xsd#fr_CapitalGainPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_CapitalGainPerShare" xlink:to="lab_fr_CapitalGainPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_IncentiveFees_83bc3aa9-54cd-45ba-be28-07bb15577445_terseLabel_en-US" xlink:label="lab_fr_IncentiveFees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incentive Fee</link:label>
    <link:label id="lab_fr_IncentiveFees_label_en-US" xlink:label="lab_fr_IncentiveFees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incentive Fees</link:label>
    <link:label id="lab_fr_IncentiveFees_documentation_en-US" xlink:label="lab_fr_IncentiveFees" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incentive Fees</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncentiveFees" xlink:href="fr-20251231.xsd#fr_IncentiveFees"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_IncentiveFees" xlink:to="lab_fr_IncentiveFees" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember_eff3842f-677c-45b3-be25-caef8952a7a7_terseLabel_en-US" xlink:label="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5500 Enterprise Court [Member]</link:label>
    <link:label id="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember_label_en-US" xlink:label="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Five Zero Zero Enterprise Court [Member]</link:label>
    <link:label id="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember_documentation_en-US" xlink:label="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five five zero zero Enterprise Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:href="fr-20251231.xsd#fr_FiveFiveZeroZeroEnterpriseCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:to="lab_fr_FiveFiveZeroZeroEnterpriseCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_c5cbbdda-2151-4c51-ae32-59ea55b4e727_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Unsecured Credit Facility</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Long-Term Lines of Credit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:to="lab_us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember_b8a9521a-2693-4fb9-b3a6-28f1a730a95f_terseLabel_en-US" xlink:label="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11601 NW 107th Street</link:label>
    <link:label id="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember_label_en-US" xlink:label="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Six Zero One NW One Hundred Seventh Street [Member]</link:label>
    <link:label id="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember_documentation_en-US" xlink:label="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Six Zero One NW One Hundred Seventh Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:href="fr-20251231.xsd#fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:to="lab_fr_OneOneSixZeroOneNWOneHundredSeventhStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember_7f8a26dc-9f60-4585-b2d4-9110a493bbf7_terseLabel_en-US" xlink:label="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11505 State Highway 225 [Member]</link:label>
    <link:label id="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember_label_en-US" xlink:label="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Five Zero Five State Highway Two Two Five [Member]</link:label>
    <link:label id="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember_documentation_en-US" xlink:label="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">11505 State Highway 225.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:href="fr-20251231.xsd#fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:to="lab_fr_OneOneFiveZeroFiveStateHighwayTwoTwoFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxLiabilities_019c49b4-9552-7796-b98b-8697208d20c5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Total Net Deferred Income Tax Liabilities</link:label>
    <link:label id="lab_us-gaap_DeferredTaxLiabilities_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxLiabilities" xlink:to="lab_us-gaap_DeferredTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0db5fa84-c305-41b3-bb5d-4c4e27a96b02_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH FLOWS FROM INVESTING ACTIVITIES:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_08888c89-8b25-4bd8-b467-c7489f8f9a95_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General and Administrative</link:label>
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and Administrative Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstParkNewCastleBuildingBMember_019c48b6-60c3-7bd3-b0ba-7e70fe1f8a6f_terseLabel_en-US" xlink:label="lab_fr_FirstParkNewCastleBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Park New Castle Building B</link:label>
    <link:label id="lab_fr_FirstParkNewCastleBuildingBMember_label_en-US" xlink:label="lab_fr_FirstParkNewCastleBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Park New Castle Building B [Member]</link:label>
    <link:label id="lab_fr_FirstParkNewCastleBuildingBMember_documentation_en-US" xlink:label="lab_fr_FirstParkNewCastleBuildingBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Park New Castle Building B</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FirstParkNewCastleBuildingBMember" xlink:href="fr-20251231.xsd#fr_FirstParkNewCastleBuildingBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FirstParkNewCastleBuildingBMember" xlink:to="lab_fr_FirstParkNewCastleBuildingBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PvpTable_terseLabel_en-US" xlink:label="lab_ecd_PvpTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pay vs Performance Disclosure</link:label>
    <link:label id="lab_ecd_PvpTable_label_en-US" xlink:label="lab_ecd_PvpTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pay vs Performance Disclosure [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PvpTable" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PvpTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PvpTable" xlink:to="lab_ecd_PvpTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_870728db-f803-4e3c-9ff4-828c4fdf2875_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Matching contributions in 401(k)/profit sharing plan</link:label>
    <link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Compensation Arrangement with Individual, Contributions by Employer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:to="lab_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineThreeZeroColumbiaAvenueMember_dba9c234-f7b7-4999-a4fb-492e0ae82c5f_terseLabel_en-US" xlink:label="lab_fr_NineThreeZeroColumbiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">930 Columbia Avenue [Member]</link:label>
    <link:label id="lab_fr_NineThreeZeroColumbiaAvenueMember_label_en-US" xlink:label="lab_fr_NineThreeZeroColumbiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Three Zero Columbia Avenue [Member]</link:label>
    <link:label id="lab_fr_NineThreeZeroColumbiaAvenueMember_documentation_en-US" xlink:label="lab_fr_NineThreeZeroColumbiaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Three Zero Columbia Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineThreeZeroColumbiaAvenueMember" xlink:href="fr-20251231.xsd#fr_NineThreeZeroColumbiaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineThreeZeroColumbiaAvenueMember" xlink:to="lab_fr_NineThreeZeroColumbiaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_fed8a0e9-2f76-49ac-8538-d2a48478b3a3_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transactions [Abstract]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transactions [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract" xlink:to="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSixTwoNineFloraBoulevardMember_e1c9ed8f-0a0e-441a-8351-da3a8b96b2c4_terseLabel_en-US" xlink:label="lab_fr_OneSixTwoNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1629 Flora Boulevard</link:label>
    <link:label id="lab_fr_OneSixTwoNineFloraBoulevardMember_label_en-US" xlink:label="lab_fr_OneSixTwoNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Six Two Nine Flora Boulevard [Member]</link:label>
    <link:label id="lab_fr_OneSixTwoNineFloraBoulevardMember_documentation_en-US" xlink:label="lab_fr_OneSixTwoNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Six Two Nine Flora Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSixTwoNineFloraBoulevardMember" xlink:href="fr-20251231.xsd#fr_OneSixTwoNineFloraBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSixTwoNineFloraBoulevardMember" xlink:to="lab_fr_OneSixTwoNineFloraBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember_e6f999fe-6e4b-4ad9-a34e-c8912c769c5d_terseLabel_en-US" xlink:label="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3851-3871 Revere [Member]</link:label>
    <link:label id="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember_label_en-US" xlink:label="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Five One Three Eight Seven One Revere [Member]</link:label>
    <link:label id="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember_documentation_en-US" xlink:label="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Five One Three Eight Seven One Revere [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:href="fr-20251231.xsd#fr_ThreeEightFiveOneThreeEightSevenOneRevereMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:to="lab_fr_ThreeEightFiveOneThreeEightSevenOneRevereMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourZeroEightOneSouthmeadowParkwayMember_7fcfd0b9-bd3c-45cd-afc2-3a3ac9feb2ba_terseLabel_en-US" xlink:label="lab_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4081 Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroEightOneSouthmeadowParkwayMember_label_en-US" xlink:label="lab_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Zero Eight One Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroEightOneSouthmeadowParkwayMember_documentation_en-US" xlink:label="lab_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four zero eight one southmeadow parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:href="fr-20251231.xsd#fr_FourZeroEightOneSouthmeadowParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:to="lab_fr_FourZeroEightOneSouthmeadowParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixZeroZeroMaddoxRoadMember_019c48a3-7f66-704e-a61d-73fe965eea88_terseLabel_en-US" xlink:label="lab_fr_SixZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">600 Maddox Road</link:label>
    <link:label id="lab_fr_SixZeroZeroMaddoxRoadMember_label_en-US" xlink:label="lab_fr_SixZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Zero Zero Maddox Road [Member]</link:label>
    <link:label id="lab_fr_SixZeroZeroMaddoxRoadMember_documentation_en-US" xlink:label="lab_fr_SixZeroZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Zero Zero Maddox Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixZeroZeroMaddoxRoadMember" xlink:href="fr-20251231.xsd#fr_SixZeroZeroMaddoxRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixZeroZeroMaddoxRoadMember" xlink:to="lab_fr_SixZeroZeroMaddoxRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixFiveFiveZeroLongpointeMember_db1ba56e-5832-42f3-a142-bcf46a696999_terseLabel_en-US" xlink:label="lab_fr_SixFiveFiveZeroLongpointeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6550 Long Point Road [Member]</link:label>
    <link:label id="lab_fr_SixFiveFiveZeroLongpointeMember_label_en-US" xlink:label="lab_fr_SixFiveFiveZeroLongpointeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Five Five Zero Longpointe [Member]</link:label>
    <link:label id="lab_fr_SixFiveFiveZeroLongpointeMember_documentation_en-US" xlink:label="lab_fr_SixFiveFiveZeroLongpointeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six five five zero Longpointe.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixFiveFiveZeroLongpointeMember" xlink:href="fr-20251231.xsd#fr_SixFiveFiveZeroLongpointeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixFiveFiveZeroLongpointeMember" xlink:to="lab_fr_SixFiveFiveZeroLongpointeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_fd9e5f7e-60af-4cde-a712-7906a8dcf6ea_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Federal</link:label>
    <link:label id="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_label_en-US" xlink:label="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Federal Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:to="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorName_289e269c-ebdf-4f42-b751-dcfa288f5769_terseLabel_en-US" xlink:label="lab_dei_AuditorName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Name</link:label>
    <link:label id="lab_dei_AuditorName_label_en-US" xlink:label="lab_dei_AuditorName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorName" xlink:to="lab_dei_AuditorName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember_e8c62fba-abbd-48b4-8451-c1f175fa0092_terseLabel_en-US" xlink:label="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">900-1100 Avenue S [Member]</link:label>
    <link:label id="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember_label_en-US" xlink:label="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Zero Zero One One Zero Zero Avenue S [Member]</link:label>
    <link:label id="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember_documentation_en-US" xlink:label="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Zero Zero One One Zero Zero Avenue S.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:href="fr-20251231.xsd#fr_NineZeroZeroOneOneZeroZeroAvenueSMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:to="lab_fr_NineZeroZeroOneOneZeroZeroAvenueSMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_694315e0-a343-4ed7-a066-33677fdf86f9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity Date</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentMaturityDate" xlink:to="lab_us-gaap_DebtInstrumentMaturityDate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_3986ea58-2222-4f85-a0f5-4eac516fb99b_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:</link:label>
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_OtherPerfMeasureAmt_terseLabel_en-US" xlink:label="lab_ecd_OtherPerfMeasureAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Performance Measure, Amount</link:label>
    <link:label id="lab_ecd_OtherPerfMeasureAmt_label_en-US" xlink:label="lab_ecd_OtherPerfMeasureAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Performance Measure, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OtherPerfMeasureAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_OtherPerfMeasureAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_OtherPerfMeasureAmt" xlink:to="lab_ecd_OtherPerfMeasureAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineZeroOneRaymondAvenueSwMember_f1cf3c33-9844-4301-85f5-80e8bb50556b_terseLabel_en-US" xlink:label="lab_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1901 Raymond Ave SW [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroOneRaymondAvenueSwMember_label_en-US" xlink:label="lab_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Zero One Raymond Avenue Sw [Member]</link:label>
    <link:label id="lab_fr_OneNineZeroOneRaymondAvenueSwMember_documentation_en-US" xlink:label="lab_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One nine zero one Raymond Avenue Sw.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:href="fr-20251231.xsd#fr_OneNineZeroOneRaymondAvenueSwMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:to="lab_fr_OneNineZeroOneRaymondAvenueSwMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateFederalIncomeTaxBasis_0108f295-06a2-4d34-9008-14c8e821c744_terseLabel_en-US" xlink:label="lab_srt_RealEstateFederalIncomeTaxBasis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate cost of land and buildings and equipment for federal income tax purpose</link:label>
    <link:label id="lab_srt_RealEstateFederalIncomeTaxBasis_label_en-US" xlink:label="lab_srt_RealEstateFederalIncomeTaxBasis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateFederalIncomeTaxBasis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateFederalIncomeTaxBasis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateFederalIncomeTaxBasis" xlink:to="lab_srt_RealEstateFederalIncomeTaxBasis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeOneZeroZeroGreggStreetMember_1e93d511-bd2e-4f3d-86eb-2e2e7581ebc7_terseLabel_en-US" xlink:label="lab_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">13100 Gregg Street [Member]</link:label>
    <link:label id="lab_fr_OneThreeOneZeroZeroGreggStreetMember_label_en-US" xlink:label="lab_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three One Zero Zero Gregg Street [Member]</link:label>
    <link:label id="lab_fr_OneThreeOneZeroZeroGreggStreetMember_documentation_en-US" xlink:label="lab_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One three one zero zero Gregg Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:href="fr-20251231.xsd#fr_OneThreeOneZeroZeroGreggStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:to="lab_fr_OneThreeOneZeroZeroGreggStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_3947046d-4a9f-4110-900e-1a30e19916b7_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember_3b759785-b460-4e54-a40d-4e30e6bd6778_terseLabel_en-US" xlink:label="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24870 Nandina Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember_label_en-US" xlink:label="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Eight Seven Zero Nandina Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Eight Seven Zero Nandina Avenue [Member].</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoFourEightSevenZeroNandinaAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:to="lab_fr_TwoFourEightSevenZeroNandinaAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_80c6b20e-652e-4942-91b9-a30f3cbaf3ca_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash</link:label>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_7a77e63a-1ca1-4182-bf0c-99f1afe2909a_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis" xlink:to="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_b06ec12f-adaf-406c-ae42-04dd53e8ca55_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value</link:label>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:to="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember_b1374966-cc00-4982-b6d8-1ca9b4873993_terseLabel_en-US" xlink:label="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1490 Dennison Circle [Member]</link:label>
    <link:label id="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember_label_en-US" xlink:label="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Thousand Four Hundred Ninety Dennison Circle [Member]</link:label>
    <link:label id="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember_documentation_en-US" xlink:label="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Thousand Four Hundred Ninety Commerce Avenue Member.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:href="fr-20251231.xsd#fr_OneThousandFourHundredNinetyDennisonCircleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:to="lab_fr_OneThousandFourHundredNinetyDennisonCircleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember_8a57c8be-ba9d-45f1-8b49-44086fbefbed_terseLabel_en-US" xlink:label="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3809 Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember_label_en-US" xlink:label="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Zero Nine Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember_documentation_en-US" xlink:label="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Zero Nine Ocean Ranch Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:href="fr-20251231.xsd#fr_ThreeEightZeroNineOceanRanchBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:to="lab_fr_ThreeEightZeroNineOceanRanchBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureMember_ef264240-8ba3-4a31-bb93-a20aad573209_terseLabel_en-US" xlink:label="lab_fr_JointVentureMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture</link:label>
    <link:label id="lab_fr_JointVentureMember_label_en-US" xlink:label="lab_fr_JointVentureMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture [Member]</link:label>
    <link:label id="lab_fr_JointVentureMember_documentation_en-US" xlink:label="lab_fr_JointVentureMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureMember" xlink:href="fr-20251231.xsd#fr_JointVentureMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureMember" xlink:to="lab_fr_JointVentureMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember_46bc98f6-2d3e-4119-95f1-63e6f252cca7_terseLabel_en-US" xlink:label="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">21110 E 31st Circle [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember_label_en-US" xlink:label="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One One One Zero East Three One Circle [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember_documentation_en-US" xlink:label="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two One One One Zero East Three One Circle [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:href="fr-20251231.xsd#fr_TwoOneOneOneZeroEastThreeOneCircleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:to="lab_fr_TwoOneOneOneZeroEastThreeOneCircleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityDomain_cde32747-6081-42fe-be4a-fd28f1b8af3d_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_label_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain" xlink:to="lab_dei_EntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_f338300b-4581-43b9-97ff-2422dc3741c8_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Cash Used in Investing Activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_126b84d6-fb9b-40c6-85cc-19e1761b5590_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Joint Venture</link:label>
    <link:label id="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_label_en-US" xlink:label="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:to="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember_terseLabel_en-US" xlink:label="lab_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table</link:label>
    <link:label id="lab_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember_label_en-US" xlink:label="lab_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:to="lab_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIMember_f5d7d063-20ad-4934-81b6-92b695085645_terseLabel_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Park 33 Building I</link:label>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIMember_label_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First Park Thirty Three Building I [Member]</link:label>
    <link:label id="lab_fr_FirstParkThirtyThreeBuildingIMember_documentation_en-US" xlink:label="lab_fr_FirstParkThirtyThreeBuildingIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First Park Thirty Three Building I</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FirstParkThirtyThreeBuildingIMember" xlink:href="fr-20251231.xsd#fr_FirstParkThirtyThreeBuildingIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FirstParkThirtyThreeBuildingIMember" xlink:to="lab_fr_FirstParkThirtyThreeBuildingIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestPaidNet_c37530ef-3c02-47db-be10-cb9486192e77_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Paid, Net of Interest Expense Capitalized</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaidNet" xlink:to="lab_us-gaap_InterestPaidNet" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThreeFiveOneRauchStMember_6813725b-d0f6-4809-9658-905687208d3b_terseLabel_en-US" xlink:label="lab_fr_ThreeThreeFiveOneRauchStMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3351 Rauch St [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeFiveOneRauchStMember_label_en-US" xlink:label="lab_fr_ThreeThreeFiveOneRauchStMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Three Five One Rauch St [Member]</link:label>
    <link:label id="lab_fr_ThreeThreeFiveOneRauchStMember_documentation_en-US" xlink:label="lab_fr_ThreeThreeFiveOneRauchStMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three three five one Rauch St.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThreeFiveOneRauchStMember" xlink:href="fr-20251231.xsd#fr_ThreeThreeFiveOneRauchStMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThreeFiveOneRauchStMember" xlink:to="lab_fr_ThreeThreeFiveOneRauchStMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalYearFocus_61dbbb38-df6c-49c1-a561-f51a2cb2c75b_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus" xlink:to="lab_dei_DocumentFiscalYearFocus" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_d5126af1-1d8f-4cba-b94b-dd06139191a1_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroZeroTysonDriveMember_aa4da5c9-ef83-4da1-81bd-d21526da10d4_terseLabel_en-US" xlink:label="lab_fr_OneZeroZeroTysonDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">100 Tyson Drive [Member]</link:label>
    <link:label id="lab_fr_OneZeroZeroTysonDriveMember_label_en-US" xlink:label="lab_fr_OneZeroZeroTysonDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Zero Tyson Drive [Member]</link:label>
    <link:label id="lab_fr_OneZeroZeroTysonDriveMember_documentation_en-US" xlink:label="lab_fr_OneZeroZeroTysonDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero Zero Tyson Drive [Member].</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroZeroTysonDriveMember" xlink:href="fr-20251231.xsd#fr_OneZeroZeroTysonDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroZeroTysonDriveMember" xlink:to="lab_fr_OneZeroZeroTysonDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_891eb694-dd5f-4265-9bac-fe93bbb2e7f1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease Right-of-Use Assets</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseCost_ba580427-ff57-432e-882d-97ad9eb17e2d_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease Expense</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost" xlink:to="lab_us-gaap_OperatingLeaseCost" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_05c9dc45-2815-4a30-a63f-0becfc2e0b50_terseLabel_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying Amount (A)</link:label>
    <link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_label_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reported Value Measurement [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:to="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1d7444e5-33e8-4565-a69e-336d6faf9826_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average period of unrecognized compensation expected to be recognized</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAbstract_be5a293d-5608-4542-853c-898616825367_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate [Abstract]</link:label>
    <link:label id="lab_us-gaap_RealEstateAbstract_label_en-US" xlink:label="lab_us-gaap_RealEstateAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAbstract" xlink:to="lab_us-gaap_RealEstateAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwentyLeoLaneMember_dd98d10f-b746-4925-90e8-6a334cdda514_terseLabel_en-US" xlink:label="lab_fr_TwentyLeoLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">20 Leo Lane [Member]</link:label>
    <link:label id="lab_fr_TwentyLeoLaneMember_label_en-US" xlink:label="lab_fr_TwentyLeoLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Twenty Leo Lane [Member]</link:label>
    <link:label id="lab_fr_TwentyLeoLaneMember_documentation_en-US" xlink:label="lab_fr_TwentyLeoLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Twenty Leo Lane [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwentyLeoLaneMember" xlink:href="fr-20251231.xsd#fr_TwentyLeoLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwentyLeoLaneMember" xlink:to="lab_fr_TwentyLeoLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember_fb82feaa-bf40-46b6-a158-2cbc0ebd5831_terseLabel_en-US" xlink:label="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Developments / Land Parcels [Member]</link:label>
    <link:label id="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember_label_en-US" xlink:label="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redevelopments Developements Developable Land [Member]</link:label>
    <link:label id="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember_documentation_en-US" xlink:label="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Redevelopments Developements Developable Land.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:href="fr-20251231.xsd#fr_RedevelopmentsDevelopementsDevelopableLandMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:to="lab_fr_RedevelopmentsDevelopementsDevelopableLandMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenFourTwoRedlandsAvenueMember_3529ed45-add4-4c7c-a1d0-eee6f5736164_terseLabel_en-US" xlink:label="lab_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4742 Redlands Avenue</link:label>
    <link:label id="lab_fr_FourSevenFourTwoRedlandsAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Four Two Redlands Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenFourTwoRedlandsAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Seven Four Two Redlands Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenFourTwoRedlandsAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:to="lab_fr_FourSevenFourTwoRedlandsAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativesPolicyTextBlock_a98911ce-25ac-4bad-931a-bbed2ddbbc74_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Financial Instruments</link:label>
    <link:label id="lab_us-gaap_DerivativesPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_DerivativesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivatives, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativesPolicyTextBlock" xlink:to="lab_us-gaap_DerivativesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureFees_15c31bdb-f3e0-472d-a16b-dd188a3b13ab_terseLabel_en-US" xlink:label="lab_fr_JointVentureFees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Fees</link:label>
    <link:label id="lab_fr_JointVentureFees_label_en-US" xlink:label="lab_fr_JointVentureFees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Fees</link:label>
    <link:label id="lab_fr_JointVentureFees_documentation_en-US" xlink:label="lab_fr_JointVentureFees" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Fees</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureFees" xlink:href="fr-20251231.xsd#fr_JointVentureFees"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureFees" xlink:to="lab_fr_JointVentureFees" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember_550b9543-a8a7-46aa-a384-d54147437332_terseLabel_en-US" xlink:label="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11204 McCormick Road [Member]</link:label>
    <link:label id="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember_label_en-US" xlink:label="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eleven Thousand Two Hundred Four Mc Cormick Road [Member]</link:label>
    <link:label id="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember_documentation_en-US" xlink:label="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eleven thousand two hundred our McCormick road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:href="fr-20251231.xsd#fr_ElevenThousandTwoHundredFourMcCormickRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:to="lab_fr_ElevenThousandTwoHundredFourMcCormickRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ServiceRLPUnitsMember_26f921ab-c6c5-4c56-9d69-6fd2d55d79c3_terseLabel_en-US" xlink:label="lab_fr_ServiceRLPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service RLP Units</link:label>
    <link:label id="lab_fr_ServiceRLPUnitsMember_label_en-US" xlink:label="lab_fr_ServiceRLPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service RLP Units [Member]</link:label>
    <link:label id="lab_fr_ServiceRLPUnitsMember_documentation_en-US" xlink:label="lab_fr_ServiceRLPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Service RLP Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ServiceRLPUnitsMember" xlink:href="fr-20251231.xsd#fr_ServiceRLPUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ServiceRLPUnitsMember" xlink:to="lab_fr_ServiceRLPUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_698cbfc2-8992-479c-9288-54b1e48ac4f2_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Federal</link:label>
    <link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_label_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Federal Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CurrentFederalTaxExpenseBenefit" xlink:to="lab_us-gaap_CurrentFederalTaxExpenseBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherCommitmentsLineItems_c6d37304-0a24-45dd-88c2-44e432feb1ff_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Line Items]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsLineItems_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentsLineItems" xlink:to="lab_us-gaap_OtherCommitmentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ea13c01f-3f2b-4057-b34f-415f2609040c_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity / Partners' Capital</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:to="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_af474108-2957-41d1-86e5-2f9994c25ab5_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_4975bfff-a990-42ce-9f8e-9ea1a2aa786c_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mark-to-Market Loss on Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
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    <link:label id="lab_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock_terseLabel_en-US" xlink:label="lab_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Total Shareholder Return</link:label>
    <link:label id="lab_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock_label_en-US" xlink:label="lab_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compensation Actually Paid vs. Total Shareholder Return [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:to="lab_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_873144ec-56db-415a-ab93-61143db3c3f4_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss) Note [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:to="lab_us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember_4709e520-9a8e-4d04-90df-547d95274c7c_terseLabel_en-US" xlink:label="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">725 Kimberly Drive [Member]</link:label>
    <link:label id="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember_label_en-US" xlink:label="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Hundred Twenty Five Kimberly Drive [Member]</link:label>
    <link:label id="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember_documentation_en-US" xlink:label="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven hundred twenty five Kimberly Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:href="fr-20251231.xsd#fr_SevenHundredTwentyFiveKimberlyDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:to="lab_fr_SevenHundredTwentyFiveKimberlyDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_3315cd90-ee7b-4ea6-869a-7eb697aaf901_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of Intangible Assets</link:label>
    <link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_label_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Intangible Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets" xlink:to="lab_us-gaap_AmortizationOfIntangibleAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember_2343a6dd-8c4b-47ac-8db7-0a345f124edd_terseLabel_en-US" xlink:label="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">21900 Dodd Boulevard [Member]</link:label>
    <link:label id="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember_label_en-US" xlink:label="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One Nine Zero Zero Dodd Boulevard [Member]</link:label>
    <link:label id="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember_documentation_en-US" xlink:label="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two one nine zero zero Dodd Boulevard.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:href="fr-20251231.xsd#fr_TwoOneNineZeroZeroDoddBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:to="lab_fr_TwoOneNineZeroZeroDoddBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember_9ce07e7c-4fff-417f-807f-f318bb5a383a_terseLabel_en-US" xlink:label="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4710 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven One Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven one zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenOneZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourSevenOneZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_7547f36e-d300-4bca-83a9-feb81f68f2da_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Accumulated Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneHundredSeventyFiveWallStreetMember_7a050f6a-0947-453d-8944-67355de8d3ce_terseLabel_en-US" xlink:label="lab_fr_OneHundredSeventyFiveWallStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">175 Wall Street [Member]</link:label>
    <link:label id="lab_fr_OneHundredSeventyFiveWallStreetMember_label_en-US" xlink:label="lab_fr_OneHundredSeventyFiveWallStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Hundred Seventy Five Wall Street [Member]</link:label>
    <link:label id="lab_fr_OneHundredSeventyFiveWallStreetMember_documentation_en-US" xlink:label="lab_fr_OneHundredSeventyFiveWallStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One hundred seventy five Wall Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneHundredSeventyFiveWallStreetMember" xlink:href="fr-20251231.xsd#fr_OneHundredSeventyFiveWallStreetMember"/>
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    <link:label id="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits_4e3e0a7b-1f32-4b5f-9bf8-7be2bbeb5954_terseLabel_en-US" xlink:label="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Partnership, shares</link:label>
    <link:label id="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits_label_en-US" xlink:label="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Conversion of Operating Partnership Units</link:label>
    <link:label id="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits_documentation_en-US" xlink:label="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Conversion of Operating Partnership Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:href="fr-20251231.xsd#fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:to="lab_fr_IncrementalCommonSharesAttributabletoConversionofOperatingPartnershipUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfBuildings_c62e90e6-7e65-41a6-afef-1af726b64083_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfBuildings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of real estate</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfBuildings_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfBuildings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Buildings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfBuildings" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfBuildings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfBuildings" xlink:to="lab_us-gaap_ProceedsFromSaleOfBuildings" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember_400bb9f3-b222-46c6-97ae-1e0142adcfb9_terseLabel_en-US" xlink:label="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1650 Highway 155 [Member]</link:label>
    <link:label id="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember_label_en-US" xlink:label="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Six Five Zero Highway One Five Five [Member]</link:label>
    <link:label id="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember_documentation_en-US" xlink:label="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One six five zero highway one five five.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:href="fr-20251231.xsd#fr_OneSixFiveZeroHighwayOneFiveFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:to="lab_fr_OneSixFiveZeroHighwayOneFiveFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrDuration_terseLabel_en-US" xlink:label="lab_ecd_TrdArrDuration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Arrangement Duration</link:label>
    <link:label id="lab_ecd_TrdArrDuration_label_en-US" xlink:label="lab_ecd_TrdArrDuration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement Duration</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrDuration" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrDuration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrDuration" xlink:to="lab_ecd_TrdArrDuration" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentOfFinancingAndStockIssuanceCosts_890c0cab-eaf9-4d7c-a918-ebf0bed1f0f2_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Financing Issuance Costs</link:label>
    <link:label id="lab_us-gaap_PaymentOfFinancingAndStockIssuanceCosts_label_en-US" xlink:label="lab_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment of Financing and Stock Issuance Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentOfFinancingAndStockIssuanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:to="lab_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member_bba0622e-98c1-4e2c-b035-4fa7a4b52899_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 II Swaps Due August 2027</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member_label_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II - August 2027) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member_documentation_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II - August 2027)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:href="fr-20251231.xsd#fr_InterestRateSwap2022SwapsIIAugust2027Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:to="lab_fr_InterestRateSwap2022SwapsIIAugust2027Member" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember_2806e22c-7e09-4212-bc74-b2ce10ba80e5_terseLabel_en-US" xlink:label="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9525 Glades Drive [Member]</link:label>
    <link:label id="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember_label_en-US" xlink:label="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nine Thousand Five Hundred Twenty Five Glades Drive [Member]</link:label>
    <link:label id="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember_documentation_en-US" xlink:label="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine thousand five hundred twenty five glades drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:href="fr-20251231.xsd#fr_NineThousandFiveHundredTwentyFiveGladesDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:to="lab_fr_NineThousandFiveHundredTwentyFiveGladesDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember_5315db3f-2cc0-4151-a4de-a4a3d0d06f8c_terseLabel_en-US" xlink:label="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">801-817 E Anaheim Street</link:label>
    <link:label id="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember_label_en-US" xlink:label="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Zero One Through Eight One Seven E Anaheim Street [Member]</link:label>
    <link:label id="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember_documentation_en-US" xlink:label="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Zero One Through Eight One Seven E Anaheim Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:href="fr-20251231.xsd#fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:to="lab_fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember_520ebe90-ccc6-4f69-9ccf-d55c5539cdff_terseLabel_en-US" xlink:label="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1270 Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember_label_en-US" xlink:label="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Seven Zero Rancho Conejo Blvd [Member]</link:label>
    <link:label id="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember_documentation_en-US" xlink:label="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One two seven zero rancho Conejo Blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:href="fr-20251231.xsd#fr_OneTwoSevenZeroRanchoConejoBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:to="lab_fr_OneTwoSevenZeroRanchoConejoBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember_f2179784-4600-4db9-b3fd-0bfbf2137f12_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2032 Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty Two [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LimitedPartnerMember_f23c0f8d-588b-499b-93a4-3b047567ecb1_verboseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnerMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Limited Partner Units</link:label>
    <link:label id="lab_us-gaap_LimitedPartnerMember_73b08a98-50c3-4519-adba-eea8ae991f5b_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Limited Partner [Member]</link:label>
    <link:label id="lab_us-gaap_LimitedPartnerMember_label_en-US" xlink:label="lab_us-gaap_LimitedPartnerMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Partner [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnerMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedPartnerMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LimitedPartnerMember" xlink:to="lab_us-gaap_LimitedPartnerMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LocalPhoneNumber_7f4d6cf5-902c-47a7-9d89-b7b95d8c4d13_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:label id="lab_dei_LocalPhoneNumber_label_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber" xlink:to="lab_dei_LocalPhoneNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_Additional402vDisclosureTextBlock_terseLabel_en-US" xlink:label="lab_ecd_Additional402vDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional 402(v) Disclosure</link:label>
    <link:label id="lab_ecd_Additional402vDisclosureTextBlock_label_en-US" xlink:label="lab_ecd_Additional402vDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional 402(v) Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Additional402vDisclosureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Additional402vDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_Additional402vDisclosureTextBlock" xlink:to="lab_ecd_Additional402vDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember_019c48a9-5b14-7482-8159-5e2939a2ffbc_terseLabel_en-US" xlink:label="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">415 Aldo Avenue &amp; 420 Nelo Street</link:label>
    <link:label id="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember_label_en-US" xlink:label="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four One Five Aldo Avenue &amp; Four Two Zero Nelo Street [Member]</link:label>
    <link:label id="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember_documentation_en-US" xlink:label="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four One Five Aldo Avenue &amp; Four Two Zero Nelo Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:href="fr-20251231.xsd#fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:to="lab_fr_FourOneFiveAldoAvenueFourTwoZeroNeloStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_30a3b756-d625-463b-9d2e-b1efb87db02c_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other Investing Activity</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment for (Proceeds from) Other Investing Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:to="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_d8c3b063-a965-4f7d-aad0-fa1f99f92585_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Maturity, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_65cf1df6-48c9-4e32-8f8e-fff31c9fa778_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-Term Compensation</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Payment Arrangement [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_7ee48525-73d5-44b5-bb0d-4325f0ed73e4_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Limited Partner Units (4,031,088 and 3,640,860&#160;units outstanding)</link:label>
    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_label_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccount" xlink:to="lab_us-gaap_LimitedPartnersCapitalAccount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember_1239b39b-97c2-4d8d-9a22-99d98b5c572d_terseLabel_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030 Private Placement Notes</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember_label_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty [Member]</link:label>
    <link:label id="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember_documentation_en-US" xlink:label="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Private Placement Notes Due Two Thousand Thirty [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:href="fr-20251231.xsd#fr_PrivatePlacementNotesDueTwoThousandThirtyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:to="lab_fr_PrivatePlacementNotesDueTwoThousandThirtyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AssetsAbstract_cc4a6205-c525-4cb9-91bc-1082b82aae72_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets:</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_3ac3e634-6b89-42d6-b470-fc91885c900b_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="lab_us-gaap_AssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_3942f30d-31c4-4b18-b091-cc3b12bf6e79_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from the Issuance of Senior Unsecured Notes, Net of Underwriter's Discount</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Unsecured Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember_cb36c33e-b721-43c9-b58e-7169fd9b4033_terseLabel_en-US" xlink:label="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1401-1419 Flora Boulevard</link:label>
    <link:label id="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember_label_en-US" xlink:label="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Zero One through One Four One Nine Flora Boulevard [Member]</link:label>
    <link:label id="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember_documentation_en-US" xlink:label="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Zero One through One Four One Nine Flora Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:href="fr-20251231.xsd#fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:to="lab_fr_OneFourZeroOneThroughOneFourOneNineFloraBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoEightZeroOneRedLionRoadMember_0b683eda-f088-414d-b195-05ffde5bf4b4_terseLabel_en-US" xlink:label="lab_fr_TwoEightZeroOneRedLionRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2801 Red Lion Road [Member]</link:label>
    <link:label id="lab_fr_TwoEightZeroOneRedLionRoadMember_label_en-US" xlink:label="lab_fr_TwoEightZeroOneRedLionRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Eight Zero One Red Lion Road [Member]</link:label>
    <link:label id="lab_fr_TwoEightZeroOneRedLionRoadMember_documentation_en-US" xlink:label="lab_fr_TwoEightZeroOneRedLionRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two eight zero one Red Lion Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoEightZeroOneRedLionRoadMember" xlink:href="fr-20251231.xsd#fr_TwoEightZeroOneRedLionRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoEightZeroOneRedLionRoadMember" xlink:to="lab_fr_TwoEightZeroOneRedLionRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_UndrlygSecurityMktPriceChngPct_terseLabel_en-US" xlink:label="lab_ecd_UndrlygSecurityMktPriceChngPct" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Underlying Security Market Price Change</link:label>
    <link:label id="lab_ecd_UndrlygSecurityMktPriceChngPct_label_en-US" xlink:label="lab_ecd_UndrlygSecurityMktPriceChngPct" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Underlying Security Market Price Change, Percent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_UndrlygSecurityMktPriceChngPct" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_UndrlygSecurityMktPriceChngPct"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_UndrlygSecurityMktPriceChngPct" xlink:to="lab_ecd_UndrlygSecurityMktPriceChngPct" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherCommitmentsAxis_c8e51ba5-a9cf-41fe-97f5-a4b0220d3a8a_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Axis]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsAxis_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentsAxis" xlink:to="lab_us-gaap_OtherCommitmentsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2021UnsecuredTermLoanMember_3e4de3de-3083-4ca1-a770-bcd44fdbe05f_terseLabel_en-US" xlink:label="lab_fr_A2021UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021 Unsecured Term Loan</link:label>
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    <link:label id="lab_fr_ThreeEightZeroOneOceanRanchBoulevardMember_documentation_en-US" xlink:label="lab_fr_ThreeEightZeroOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Zero One Ocean Ranch Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightZeroOneOceanRanchBoulevardMember" xlink:href="fr-20251231.xsd#fr_ThreeEightZeroOneOceanRanchBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightZeroOneOceanRanchBoulevardMember" xlink:to="lab_fr_ThreeEightZeroOneOceanRanchBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Land_6601aa30-7e60-4a2e-9ebb-ac05bfa38197_terseLabel_en-US" xlink:label="lab_us-gaap_Land" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land</link:label>
    <link:label id="lab_us-gaap_Land_label_en-US" xlink:label="lab_us-gaap_Land" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Land" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Land"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Land" xlink:to="lab_us-gaap_Land" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember_b2f93980-773e-4e48-b1e2-71aec1d5709f_terseLabel_en-US" xlink:label="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11701 East 53rd Avenue [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember_label_en-US" xlink:label="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Seven Zero One East Five Three Rd Avenue [Member]</link:label>
    <link:label id="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember_documentation_en-US" xlink:label="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Seven Zero One East Five Three Rd Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:href="fr-20251231.xsd#fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:to="lab_fr_OneOneSevenZeroOneEastFiveThreeRdAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccountsReceivableNet_08f3531b-1d05-47e7-b349-58d02071bdcf_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tenant Accounts Receivable</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNet_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, after Allowance for Credit Loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNet" xlink:to="lab_us-gaap_AccountsReceivableNet" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_dccf3e19-1ff9-4895-b805-eb647ccb0202_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseDiscountRate_9ee8e538-fd4a-4697-b803-58dfb4e17c70_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseDiscountRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Weighted Average Discount Rate</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseDiscountRate_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseDiscountRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Discount Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseDiscountRate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseDiscountRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseDiscountRate" xlink:to="lab_us-gaap_LesseeOperatingLeaseDiscountRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_StkPrcOrTsrEstimationMethodTextBlock_terseLabel_en-US" xlink:label="lab_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Price or TSR Estimation Method</link:label>
    <link:label id="lab_ecd_StkPrcOrTsrEstimationMethodTextBlock_label_en-US" xlink:label="lab_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Price or TSR Estimation Method [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_StkPrcOrTsrEstimationMethodTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:to="lab_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourZeroFiveZeroDayStreetMember_2587060c-f274-4a7a-afa7-2c572c4720c1_terseLabel_en-US" xlink:label="lab_fr_OneFourZeroFiveZeroDayStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14050 Day Street [Member]</link:label>
    <link:label id="lab_fr_OneFourZeroFiveZeroDayStreetMember_label_en-US" xlink:label="lab_fr_OneFourZeroFiveZeroDayStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Zero Five Zero Day Street [Member]</link:label>
    <link:label id="lab_fr_OneFourZeroFiveZeroDayStreetMember_documentation_en-US" xlink:label="lab_fr_OneFourZeroFiveZeroDayStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One four zero five zero day street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourZeroFiveZeroDayStreetMember" xlink:href="fr-20251231.xsd#fr_OneFourZeroFiveZeroDayStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourZeroFiveZeroDayStreetMember" xlink:to="lab_fr_OneFourZeroFiveZeroDayStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestExpenseOther_27ad57bb-5264-4276-9b0a-3f8808fb348d_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Expense - Settlement (Receipts) Payments</link:label>
    <link:label id="lab_us-gaap_InterestExpenseOther_label_en-US" xlink:label="lab_us-gaap_InterestExpenseOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOther" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseOther" xlink:to="lab_us-gaap_InterestExpenseOther" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions_6e2beb3e-7d0c-4eaf-991f-89089bf9a5cc_negatedLabel_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Write-off of Fully Depreciated and Other Assets</link:label>
    <link:label id="lab_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions_label_en-US" xlink:label="lab_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Other Deduction</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateAccumulatedDepreciationOtherDeductions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions" xlink:to="lab_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixThreeZeroOneLyonsRoadMember_b618df51-9651-443f-89cf-eea95459ad64_terseLabel_en-US" xlink:label="lab_fr_SixThreeZeroOneLyonsRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6301 Lyons Road [Member]</link:label>
    <link:label id="lab_fr_SixThreeZeroOneLyonsRoadMember_label_en-US" xlink:label="lab_fr_SixThreeZeroOneLyonsRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Three Zero One Lyons Road [Member]</link:label>
    <link:label id="lab_fr_SixThreeZeroOneLyonsRoadMember_documentation_en-US" xlink:label="lab_fr_SixThreeZeroOneLyonsRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Three Zero One Lyons Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixThreeZeroOneLyonsRoadMember" xlink:href="fr-20251231.xsd#fr_SixThreeZeroOneLyonsRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixThreeZeroOneLyonsRoadMember" xlink:to="lab_fr_SixThreeZeroOneLyonsRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeZeroOneWCopansRoadLandMember_267441e7-05bd-474c-b7c8-3bd899321353_terseLabel_en-US" xlink:label="lab_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5301 W. Copans Road Land</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneWCopansRoadLandMember_label_en-US" xlink:label="lab_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Zero One W Copans Road Land [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneWCopansRoadLandMember_documentation_en-US" xlink:label="lab_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Three Zero One W Copans Road Land</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:href="fr-20251231.xsd#fr_FiveThreeZeroOneWCopansRoadLandMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:to="lab_fr_FiveThreeZeroOneWCopansRoadLandMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneOneZeroHuttonDriveMember_7d38ecf8-0096-4cf1-a7f8-8742d4844ee6_terseLabel_en-US" xlink:label="lab_fr_TwoOneOneZeroHuttonDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2110 Hutton Drive [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneZeroHuttonDriveMember_label_en-US" xlink:label="lab_fr_TwoOneOneZeroHuttonDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One One Zero Hutton Drive [Member]</link:label>
    <link:label id="lab_fr_TwoOneOneZeroHuttonDriveMember_documentation_en-US" xlink:label="lab_fr_TwoOneOneZeroHuttonDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two one one zero Hutton Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneOneZeroHuttonDriveMember" xlink:href="fr-20251231.xsd#fr_TwoOneOneZeroHuttonDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneOneZeroHuttonDriveMember" xlink:to="lab_fr_TwoOneOneZeroHuttonDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_8030c193-5129-40a7-a563-d68fde0007d1_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance Units/RLP Unit Awards issued</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OwnershipMember_c427621e-f5b9-4e34-a127-e85198c134dc_terseLabel_en-US" xlink:label="lab_fr_OwnershipMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Member]</link:label>
    <link:label id="lab_fr_OwnershipMember_label_en-US" xlink:label="lab_fr_OwnershipMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership [Member]</link:label>
    <link:label id="lab_fr_OwnershipMember_documentation_en-US" xlink:label="lab_fr_OwnershipMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ownership</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OwnershipMember" xlink:href="fr-20251231.xsd#fr_OwnershipMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OwnershipMember" xlink:to="lab_fr_OwnershipMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureBuildingAMember_019c4514-1ccc-7924-b0ab-cb7eaac76047_terseLabel_en-US" xlink:label="lab_fr_JointVentureBuildingAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Building A</link:label>
    <link:label id="lab_fr_JointVentureBuildingAMember_label_en-US" xlink:label="lab_fr_JointVentureBuildingAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Building A [Member]</link:label>
    <link:label id="lab_fr_JointVentureBuildingAMember_documentation_en-US" xlink:label="lab_fr_JointVentureBuildingAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Building A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureBuildingAMember" xlink:href="fr-20251231.xsd#fr_JointVentureBuildingAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureBuildingAMember" xlink:to="lab_fr_JointVentureBuildingAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_36cef2b9-29b8-4fd7-99ec-4e89d1601a40_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Indebtedness</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Debt [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDebtTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDebtTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfDebtTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_f7d2d483-c303-40a3-b212-ce0489edc248_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issued, Weighted Average Grant Date Fair Value</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember_2afabf56-2ce8-4060-a734-d955333c284a_terseLabel_en-US" xlink:label="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">18201-18291 Santa Fe [Member]</link:label>
    <link:label id="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember_label_en-US" xlink:label="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight Two Zero One To One Eight Two Nine One Santa Fe [Member]</link:label>
    <link:label id="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember_documentation_en-US" xlink:label="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight two zero one to one eight two nine one Santa Fe.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:href="fr-20251231.xsd#fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:to="lab_fr_OneEightTwoZeroOneToOneEightTwoNineOneSantaFeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveFiveZeroOneNCottonLaneMember_019c48b0-4092-765a-be48-f78d486b7b44_terseLabel_en-US" xlink:label="lab_fr_FiveFiveZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5501 N. Cotton Lane</link:label>
    <link:label id="lab_fr_FiveFiveZeroOneNCottonLaneMember_label_en-US" xlink:label="lab_fr_FiveFiveZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Five Zero One N Cotton Lane [Member]</link:label>
    <link:label id="lab_fr_FiveFiveZeroOneNCottonLaneMember_documentation_en-US" xlink:label="lab_fr_FiveFiveZeroOneNCottonLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Five Zero One N Cotton Lane</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveFiveZeroOneNCottonLaneMember" xlink:href="fr-20251231.xsd#fr_FiveFiveZeroOneNCottonLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveFiveZeroOneNCottonLaneMember" xlink:to="lab_fr_FiveFiveZeroOneNCottonLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_41aa61dd-46d4-4b76-82e8-85708d1d21a9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Deferred Leasing Intangibles</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Finite-Lived Intangible Assets [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_a44e0f59-6a21-4e72-a14b-1c68cb40398d_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repayments on Unsecured Credit Facility</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Long-Term Lines of Credit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:to="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_RestatementDateAxis_terseLabel_en-US" xlink:label="lab_ecd_RestatementDateAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restatement Determination Date:</link:label>
    <link:label id="lab_ecd_RestatementDateAxis_label_en-US" xlink:label="lab_ecd_RestatementDateAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restatement Determination Date [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RestatementDateAxis" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_RestatementDateAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_RestatementDateAxis" xlink:to="lab_ecd_RestatementDateAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember_6e36a46d-1c69-43f0-bfab-fdc2ce03df93_terseLabel_en-US" xlink:label="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">22630 Dulles Summit Court [Member]</link:label>
    <link:label id="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember_label_en-US" xlink:label="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Twenty Two Thousand Six Hundred Thirty Dulles Summit Court [Member]</link:label>
    <link:label id="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember_documentation_en-US" xlink:label="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Twenty two thousand six hundred thirty Dulles Summit Court.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:href="fr-20251231.xsd#fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:to="lab_fr_TwentyTwoThousandSixHundredThirtyDullesSummitCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_03512d3f-61fd-471f-a7b4-9f47ded10e94_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Based Compensation Activity</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_8da89f4a-ee6c-4e12-9f5f-051d52b20c66_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:type="arc" order="1"/>
    <link:label id="lab_stpr_AZ_019c49bc-00cc-7890-b3e5-239bfca0a40c_terseLabel_en-US" xlink:label="lab_stpr_AZ" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ARIZONA</link:label>
    <link:label id="lab_stpr_AZ_label_en-US" xlink:label="lab_stpr_AZ" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ARIZONA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_AZ" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_AZ"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_stpr_AZ" xlink:to="lab_stpr_AZ" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_a93091a4-876a-4467-9fd3-e4e666b380fd_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Amounts Reclassified from Accumulated Other Comprehensive (Income) Loss</link:label>
    <link:label id="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_label_en-US" xlink:label="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:to="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember_c3f94e72-2f62-49ec-95b2-bbdc611ef577_terseLabel_en-US" xlink:label="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">13414 South Figueroa [Member]</link:label>
    <link:label id="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember_label_en-US" xlink:label="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Thirteen Thousand Four Hundred Fourteen South Figueroa [Member]</link:label>
    <link:label id="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember_documentation_en-US" xlink:label="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Thirteen Thousand Four Hundred Fourteen South Figueroa [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:href="fr-20251231.xsd#fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:to="lab_fr_ThirteenThousandFourHundredFourteenSouthFigueroaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrIndName_terseLabel_en-US" xlink:label="lab_ecd_TrdArrIndName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name</link:label>
    <link:label id="lab_ecd_TrdArrIndName_label_en-US" xlink:label="lab_ecd_TrdArrIndName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement, Individual Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrIndName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrIndName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrIndName" xlink:to="lab_ecd_TrdArrIndName" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_f438e7ef-15c8-4e68-8107-59a09fda874e_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion of Limited Partner Units to Common Stock / General Partner Units</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Conversion of Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixOneNineEastSamHoustonParkwaySMember_742fd43e-3e5d-4039-a148-b3ef47eee041_terseLabel_en-US" xlink:label="lab_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">619 East Sam Houston Parkway S [Member]</link:label>
    <link:label id="lab_fr_SixOneNineEastSamHoustonParkwaySMember_label_en-US" xlink:label="lab_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six One Nine East Sam Houston Parkway S [Member]</link:label>
    <link:label id="lab_fr_SixOneNineEastSamHoustonParkwaySMember_documentation_en-US" xlink:label="lab_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six One Nine East Sam Houston Parkway S [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:href="fr-20251231.xsd#fr_SixOneNineEastSamHoustonParkwaySMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:to="lab_fr_SixOneNineEastSamHoustonParkwaySMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EstimatedTotalInvestment_61869d6c-1a38-4797-ba06-67a44904edd7_terseLabel_en-US" xlink:label="lab_fr_EstimatedTotalInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated total investment</link:label>
    <link:label id="lab_fr_EstimatedTotalInvestment_label_en-US" xlink:label="lab_fr_EstimatedTotalInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Estimated Total Investment</link:label>
    <link:label id="lab_fr_EstimatedTotalInvestment_documentation_en-US" xlink:label="lab_fr_EstimatedTotalInvestment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Estimated total investment of industrial properties under construction.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EstimatedTotalInvestment" xlink:href="fr-20251231.xsd#fr_EstimatedTotalInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EstimatedTotalInvestment" xlink:to="lab_fr_EstimatedTotalInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterestInJointVentures_870a4b50-9c90-4648-906f-e7f791f98529_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestInJointVentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest in Joint Ventures</link:label>
    <link:label id="lab_us-gaap_MinorityInterestInJointVentures_label_en-US" xlink:label="lab_us-gaap_MinorityInterestInJointVentures" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest in Joint Ventures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestInJointVentures" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestInJointVentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestInJointVentures" xlink:to="lab_us-gaap_MinorityInterestInJointVentures" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSevenFiveOneSkinnerCourtMember_a393a77f-4c7e-4396-bd94-95066cd8b405_terseLabel_en-US" xlink:label="lab_fr_EightSevenFiveOneSkinnerCourtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8751 Skinner Court [Member]</link:label>
    <link:label id="lab_fr_EightSevenFiveOneSkinnerCourtMember_label_en-US" xlink:label="lab_fr_EightSevenFiveOneSkinnerCourtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Seven Five One Skinner Court [Member]</link:label>
    <link:label id="lab_fr_EightSevenFiveOneSkinnerCourtMember_documentation_en-US" xlink:label="lab_fr_EightSevenFiveOneSkinnerCourtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Seven Five One Skinner Court [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSevenFiveOneSkinnerCourtMember" xlink:href="fr-20251231.xsd#fr_EightSevenFiveOneSkinnerCourtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSevenFiveOneSkinnerCourtMember" xlink:to="lab_fr_EightSevenFiveOneSkinnerCourtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_4f01d511-6d5c-4b4c-8a4b-d051c7a98fd2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured term loan, face amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember_87148959-084c-46ad-bf9b-5bbc7baddd66_terseLabel_en-US" xlink:label="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">13351 12th Street</link:label>
    <link:label id="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember_label_en-US" xlink:label="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Three Five One Twelfth Street [Member]</link:label>
    <link:label id="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember_documentation_en-US" xlink:label="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Three Five One Twelfth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:href="fr-20251231.xsd#fr_OneThreeThreeFiveOneTwelfthStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:to="lab_fr_OneThreeThreeFiveOneTwelfthStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale_bde59a21-def2-42d5-b904-d505b29b0a07_terseLabel_en-US" xlink:label="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Held for Sale</link:label>
    <link:label id="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale_label_en-US" xlink:label="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule III Investment in Real Estate Held for Sale</link:label>
    <link:label id="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale_documentation_en-US" xlink:label="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule III Investment in Real Estate Held for Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:href="fr-20251231.xsd#fr_ScheduleIIIInvestmentInRealEstateHeldForSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:to="lab_fr_ScheduleIIIInvestmentInRealEstateHeldForSale" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_26af1716-7364-473c-9444-c0eb11984302_terseLabel_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineSixFourKelloggAvenueMember_c5aa3a6f-004f-4147-9639-d6c62e9de751_terseLabel_en-US" xlink:label="lab_fr_OneNineSixFourKelloggAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1964 Kellogg Avenue [Member]</link:label>
    <link:label id="lab_fr_OneNineSixFourKelloggAvenueMember_label_en-US" xlink:label="lab_fr_OneNineSixFourKelloggAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Six Four Kellogg Avenue [Member]</link:label>
    <link:label id="lab_fr_OneNineSixFourKelloggAvenueMember_documentation_en-US" xlink:label="lab_fr_OneNineSixFourKelloggAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Nine Six Four Kellogg Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineSixFourKelloggAvenueMember" xlink:href="fr-20251231.xsd#fr_OneNineSixFourKelloggAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineSixFourKelloggAvenueMember" xlink:to="lab_fr_OneNineSixFourKelloggAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_019c45c6-919a-765a-aebe-05ddc79614d7_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Basis Difference - Investment in Joint Venture</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Property, Plant and Equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment" xlink:to="lab_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightFourZeroSixNWNinetiethStreetMember_a9a85d55-4736-4e34-87b1-4daaa67592a8_terseLabel_en-US" xlink:label="lab_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8406 NW 90th Street</link:label>
    <link:label id="lab_fr_EightFourZeroSixNWNinetiethStreetMember_label_en-US" xlink:label="lab_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Four Zero Six NW Ninetieth Street [Member]</link:label>
    <link:label id="lab_fr_EightFourZeroSixNWNinetiethStreetMember_documentation_en-US" xlink:label="lab_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Four Zero Six NW Ninetieth Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:href="fr-20251231.xsd#fr_EightFourZeroSixNWNinetiethStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:to="lab_fr_EightFourZeroSixNWNinetiethStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardsCloseToMnpiDiscIndName_terseLabel_en-US" xlink:label="lab_ecd_AwardsCloseToMnpiDiscIndName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name</link:label>
    <link:label id="lab_ecd_AwardsCloseToMnpiDiscIndName_label_en-US" xlink:label="lab_ecd_AwardsCloseToMnpiDiscIndName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Awards Close in Time to MNPI Disclosures, Individual Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardsCloseToMnpiDiscIndName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardsCloseToMnpiDiscIndName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardsCloseToMnpiDiscIndName" xlink:to="lab_ecd_AwardsCloseToMnpiDiscIndName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember_b01ab220-a804-407c-85fd-b589ac49ba0e_terseLabel_en-US" xlink:label="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">18640 68th Avenue South [Member]</link:label>
    <link:label id="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember_label_en-US" xlink:label="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight Six Four Zero Six Eight Avenue South [Member]</link:label>
    <link:label id="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember_documentation_en-US" xlink:label="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight six four zero six eight Avenue South.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:href="fr-20251231.xsd#fr_OneEightSixFourZeroSixEightAvenueSouthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:to="lab_fr_OneEightSixFourZeroSixEightAvenueSouthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_87d13256-b4cf-49ff-8b3a-c73f240e33f9_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding, Weighted Average Grant Date Fair Value, Beginning of Period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b273b145-0cf5-4871-9164-22263864ed96_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding, Weighted Average Grant Date Fair Value, End of Period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdditionalCashAndCashEquivalentRelatedText_2b95238c-bcac-4fa2-981e-d08e25458b0b_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity of liquid investments</link:label>
    <link:label id="lab_us-gaap_AdditionalCashAndCashEquivalentRelatedText_label_en-US" xlink:label="lab_us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Cash and Cash Equivalent Related Text</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalCashAndCashEquivalentRelatedText"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:to="lab_us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AggtErrCompNotYetDeterminedTextBlock_terseLabel_en-US" xlink:label="lab_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Erroneous Compensation Not Yet Determined</link:label>
    <link:label id="lab_ecd_AggtErrCompNotYetDeterminedTextBlock_label_en-US" xlink:label="lab_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Erroneous Compensation Not Yet Determined [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AggtErrCompNotYetDeterminedTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:to="lab_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_a7d15a79-b631-429a-9a65-f9a32be1c6f8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reallocation&#8212;Other Comprehensive Income</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_821e4362-c773-41ee-a672-4d0d4ca9d3d9_terseLabel_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_label_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_IcfrAuditorAttestationFlag" xlink:to="lab_dei_IcfrAuditorAttestationFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember_662fc46d-6033-424d-88a3-dbf206604515_terseLabel_en-US" xlink:label="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4800 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Eight Zero Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four eight zero zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourEightZeroZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourEightZeroZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember_3ae8cafc-b2d4-466c-a0a8-50d432a7f34a_terseLabel_en-US" xlink:label="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1351 NW 78th Avenue [Member]</link:label>
    <link:label id="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember_label_en-US" xlink:label="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Five One NW Seven Eight TH Avenue [Member]</link:label>
    <link:label id="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember_documentation_en-US" xlink:label="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Five One NW Seven Eight TH Avenue [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:href="fr-20251231.xsd#fr_OneThreeFiveOneNWSevenEightTHAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:to="lab_fr_OneThreeFiveOneNWSevenEightTHAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorFirmId_0ef08050-120d-4e78-9b88-d17e5e8508ce_terseLabel_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:label id="lab_dei_AuditorFirmId_label_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorFirmId" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorFirmId"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorFirmId" xlink:to="lab_dei_AuditorFirmId" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenThreeERiderStreetMember_48c95c0d-4801-41fe-9fd0-e7266aab501e_terseLabel_en-US" xlink:label="lab_fr_FourSevenThreeERiderStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">473 E. Rider Street</link:label>
    <link:label id="lab_fr_FourSevenThreeERiderStreetMember_label_en-US" xlink:label="lab_fr_FourSevenThreeERiderStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Three E Rider Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenThreeERiderStreetMember_documentation_en-US" xlink:label="lab_fr_FourSevenThreeERiderStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Seven Three E Rider Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenThreeERiderStreetMember" xlink:href="fr-20251231.xsd#fr_FourSevenThreeERiderStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenThreeERiderStreetMember" xlink:to="lab_fr_FourSevenThreeERiderStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourEightSevenTwoSLapeerRoadMember_ce2c4cbd-7c2d-4f3e-9500-715bb8315d19_terseLabel_en-US" xlink:label="lab_fr_FourEightSevenTwoSLapeerRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4872 S. Lapeer Road [Member]</link:label>
    <link:label id="lab_fr_FourEightSevenTwoSLapeerRoadMember_label_en-US" xlink:label="lab_fr_FourEightSevenTwoSLapeerRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Eight Seven Two S Lapeer Road [Member]</link:label>
    <link:label id="lab_fr_FourEightSevenTwoSLapeerRoadMember_documentation_en-US" xlink:label="lab_fr_FourEightSevenTwoSLapeerRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four eight seven two S. Lapeer Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourEightSevenTwoSLapeerRoadMember" xlink:href="fr-20251231.xsd#fr_FourEightSevenTwoSLapeerRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourEightSevenTwoSLapeerRoadMember" xlink:to="lab_fr_FourEightSevenTwoSLapeerRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroFourFiveSouthEdwardDriveMember_9a76107f-d74d-4025-8127-9bc240073f2e_terseLabel_en-US" xlink:label="lab_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1045 South Edward Drive [Member]</link:label>
    <link:label id="lab_fr_OneZeroFourFiveSouthEdwardDriveMember_label_en-US" xlink:label="lab_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Four Five South Edward Drive [Member]</link:label>
    <link:label id="lab_fr_OneZeroFourFiveSouthEdwardDriveMember_documentation_en-US" xlink:label="lab_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One zero four five south Edward Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:href="fr-20251231.xsd#fr_OneZeroFourFiveSouthEdwardDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:to="lab_fr_OneZeroFourFiveSouthEdwardDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember_9cacf34e-eaf3-4008-a8ea-7320bd16d0ea_terseLabel_en-US" xlink:label="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">42650 Osgood Road</link:label>
    <link:label id="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember_label_en-US" xlink:label="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Two Six Five Zero Osgood Road [Member]</link:label>
    <link:label id="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember_documentation_en-US" xlink:label="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Two Six Five Zero Osgood Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:href="fr-20251231.xsd#fr_FourTwoSixFiveZeroOsgoodRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:to="lab_fr_FourTwoSixFiveZeroOsgoodRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e2b6fc34-e84a-4324-96f0-686e9bd3281c_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Fair Value Hierarchy [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2025InterestRateSwapsMember_019c44f1-fc47-7274-a71a-c269d1139b81_terseLabel_en-US" xlink:label="lab_fr_A2025InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2025 Swaps</link:label>
    <link:label id="lab_fr_A2025InterestRateSwapsMember_label_en-US" xlink:label="lab_fr_A2025InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2025 Interest Rate Swaps [Member]</link:label>
    <link:label id="lab_fr_A2025InterestRateSwapsMember_documentation_en-US" xlink:label="lab_fr_A2025InterestRateSwapsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2025 Interest Rate Swaps</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2025InterestRateSwapsMember" xlink:href="fr-20251231.xsd#fr_A2025InterestRateSwapsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2025InterestRateSwapsMember" xlink:to="lab_fr_A2025InterestRateSwapsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember_aa36a5b8-45f1-40ab-aa5d-3d4eac613725_terseLabel_en-US" xlink:label="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1709-1811 W. Mahalo Place [Member]</link:label>
    <link:label id="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember_label_en-US" xlink:label="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Zero Nine - One Eight One One W. Mahalo Place [Member]</link:label>
    <link:label id="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember_documentation_en-US" xlink:label="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Seven Zero Nine - One Eight One One W. Mahalo Place [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:href="fr-20251231.xsd#fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:to="lab_fr_OneSevenZeroNineOneEightOneOneW.MahaloPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_AboveAndBelowMarketLeasesMember_6e646595-7319-4bec-8855-5e8fd1af7a6f_terseLabel_en-US" xlink:label="lab_fr_AboveAndBelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Above and Below Market Leases</link:label>
    <link:label id="lab_fr_AboveAndBelowMarketLeasesMember_label_en-US" xlink:label="lab_fr_AboveAndBelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Above And Below Market Leases [Member]</link:label>
    <link:label id="lab_fr_AboveAndBelowMarketLeasesMember_documentation_en-US" xlink:label="lab_fr_AboveAndBelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Above and Below Market Leases [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_AboveAndBelowMarketLeasesMember" xlink:href="fr-20251231.xsd#fr_AboveAndBelowMarketLeasesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_AboveAndBelowMarketLeasesMember" xlink:to="lab_fr_AboveAndBelowMarketLeasesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember_58eff88f-9009-40aa-b461-966033e2cf2a_terseLabel_en-US" xlink:label="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14131 N. Rio Vista Blvd [Member]</link:label>
    <link:label id="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember_label_en-US" xlink:label="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four One Three One N Rio Vista Blvd [Member]</link:label>
    <link:label id="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember_documentation_en-US" xlink:label="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One four one three one N Rio Vista Blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:href="fr-20251231.xsd#fr_OneFourOneThreeOneNRioVistaBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:to="lab_fr_OneFourOneThreeOneNRioVistaBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_74a87ae3-984e-42c0-b411-b025bee07ae6_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings Per Share/Unit (EPS/EPU)</link:label>
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerSharePolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerSharePolicyTextBlock" xlink:to="lab_us-gaap_EarningsPerSharePolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoFiveZeroEFrancisStreetMember_2bd9f9a6-d9e4-42f2-b585-042a5d52d68e_terseLabel_en-US" xlink:label="lab_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1250 E. Francis Street</link:label>
    <link:label id="lab_fr_OneTwoFiveZeroEFrancisStreetMember_label_en-US" xlink:label="lab_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Five Zero E Francis Street [Member]</link:label>
    <link:label id="lab_fr_OneTwoFiveZeroEFrancisStreetMember_documentation_en-US" xlink:label="lab_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Two Five Zero E Francis Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:href="fr-20251231.xsd#fr_OneTwoFiveZeroEFrancisStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:to="lab_fr_OneTwoFiveZeroEFrancisStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PropertyManagementFeeDeferred_a41953ba-a6eb-495b-938f-d4e532c09351_terseLabel_en-US" xlink:label="lab_fr_PropertyManagementFeeDeferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Management Fee Deferred</link:label>
    <link:label id="lab_fr_PropertyManagementFeeDeferred_label_en-US" xlink:label="lab_fr_PropertyManagementFeeDeferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Management Fee Deferred</link:label>
    <link:label id="lab_fr_PropertyManagementFeeDeferred_documentation_en-US" xlink:label="lab_fr_PropertyManagementFeeDeferred" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Property Management Fee Deferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PropertyManagementFeeDeferred" xlink:href="fr-20251231.xsd#fr_PropertyManagementFeeDeferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PropertyManagementFeeDeferred" xlink:to="lab_fr_PropertyManagementFeeDeferred" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_75253589-f164-4dce-8c4c-9a35dd7e3fd8_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionPolicyTextBlock" xlink:to="lab_us-gaap_RevenueRecognitionPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightOneParagonDriveMember_25c69c3b-1f60-432c-b101-0076360fa6ec_terseLabel_en-US" xlink:label="lab_fr_EightOneParagonDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">81 Paragon Drive [Member]</link:label>
    <link:label id="lab_fr_EightOneParagonDriveMember_label_en-US" xlink:label="lab_fr_EightOneParagonDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight One Paragon Drive [Member]</link:label>
    <link:label id="lab_fr_EightOneParagonDriveMember_documentation_en-US" xlink:label="lab_fr_EightOneParagonDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight One Paragon Drive [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightOneParagonDriveMember" xlink:href="fr-20251231.xsd#fr_EightOneParagonDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightOneParagonDriveMember" xlink:to="lab_fr_EightOneParagonDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AllExecutiveCategoriesMember_terseLabel_en-US" xlink:label="lab_ecd_AllExecutiveCategoriesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Executive Categories</link:label>
    <link:label id="lab_ecd_AllExecutiveCategoriesMember_label_en-US" xlink:label="lab_ecd_AllExecutiveCategoriesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Executive Categories [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllExecutiveCategoriesMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllExecutiveCategoriesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AllExecutiveCategoriesMember" xlink:to="lab_ecd_AllExecutiveCategoriesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFiveNineZeroERiverviewDrMember_ac9d1206-9477-4158-b694-7352752a1fc4_terseLabel_en-US" xlink:label="lab_fr_OneFiveNineZeroERiverviewDrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1590 E Riverview Dr. [Member]</link:label>
    <link:label id="lab_fr_OneFiveNineZeroERiverviewDrMember_label_en-US" xlink:label="lab_fr_OneFiveNineZeroERiverviewDrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Five Nine Zero E Riverview Dr [Member]</link:label>
    <link:label id="lab_fr_OneFiveNineZeroERiverviewDrMember_documentation_en-US" xlink:label="lab_fr_OneFiveNineZeroERiverviewDrMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One five nine zero E Riverview Dr.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFiveNineZeroERiverviewDrMember" xlink:href="fr-20251231.xsd#fr_OneFiveNineZeroERiverviewDrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFiveNineZeroERiverviewDrMember" xlink:to="lab_fr_OneFiveNineZeroERiverviewDrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenSevenZeroFoxStreetMember_ccfa1d68-23e1-4978-a5b8-98cc66a0e12b_terseLabel_en-US" xlink:label="lab_fr_FourSevenSevenZeroFoxStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4770 Fox Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenSevenZeroFoxStreetMember_label_en-US" xlink:label="lab_fr_FourSevenSevenZeroFoxStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Seven Zero Fox Street [Member]</link:label>
    <link:label id="lab_fr_FourSevenSevenZeroFoxStreetMember_documentation_en-US" xlink:label="lab_fr_FourSevenSevenZeroFoxStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Seven Seven Zero Fox Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenSevenZeroFoxStreetMember" xlink:href="fr-20251231.xsd#fr_FourSevenSevenZeroFoxStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenSevenZeroFoxStreetMember" xlink:to="lab_fr_FourSevenSevenZeroFoxStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_AcquisitionActivityMember_6188bd48-e954-41df-8862-e43f72245faa_terseLabel_en-US" xlink:label="lab_fr_AcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition Activity</link:label>
    <link:label id="lab_fr_AcquisitionActivityMember_label_en-US" xlink:label="lab_fr_AcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition Activity [Member]</link:label>
    <link:label id="lab_fr_AcquisitionActivityMember_documentation_en-US" xlink:label="lab_fr_AcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Acquisition Activity [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_AcquisitionActivityMember" xlink:href="fr-20251231.xsd#fr_AcquisitionActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_AcquisitionActivityMember" xlink:to="lab_fr_AcquisitionActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_019c45c4-1644-7e56-8204-4904717fa13c_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Deferred Tax Assets and Liabilities</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Deferred Tax Assets and Liabilities [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherOperatingIncome_c5d6f308-bcb1-40a1-a8e3-2108fd208cb6_terseLabel_en-US" xlink:label="lab_us-gaap_OtherOperatingIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Revenue</link:label>
    <link:label id="lab_us-gaap_OtherOperatingIncome_label_en-US" xlink:label="lab_us-gaap_OtherOperatingIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Operating Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherOperatingIncome" xlink:to="lab_us-gaap_OtherOperatingIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockValue_4dfe0e6f-796e-45ba-8c1a-93d2e8e380c5_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock ($0.01&#160;par value, 225,000,000 shares authorized and 132,470,326 and 132,349,119&#160;shares issued and outstanding)</link:label>
    <link:label id="lab_us-gaap_CommonStockValue_label_en-US" xlink:label="lab_us-gaap_CommonStockValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Value, Issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockValue" xlink:to="lab_us-gaap_CommonStockValue" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_TitleOfIndividualAxis_ba2c39a2-d7ff-4da5-9e53-c833a0eff810_terseLabel_en-US" xlink:label="lab_srt_TitleOfIndividualAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title and Position [Axis]</link:label>
    <link:label id="lab_srt_TitleOfIndividualAxis_label_en-US" xlink:label="lab_srt_TitleOfIndividualAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title and Position [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
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    <link:label id="lab_fr_TenZeroFiveAndOneHundredOneStStreetMember_6e2ee0e4-dcc1-48bb-b2c6-6a921337c093_terseLabel_en-US" xlink:label="lab_fr_TenZeroFiveAndOneHundredOneStStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1005 101st Street [Member]</link:label>
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    <link:label id="lab_fr_TenZeroFiveAndOneHundredOneStStreetMember_documentation_en-US" xlink:label="lab_fr_TenZeroFiveAndOneHundredOneStStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ten Zero Five And One Hundred One St Street [Member]</link:label>
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    <link:label id="lab_us-gaap_CommitmentsAndContingencies_63944353-abae-4f4c-bb21-d5aa316b6481_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingencies" xlink:to="lab_us-gaap_CommitmentsAndContingencies" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_873092a8-3341-4e5f-8ce8-d5a142c8559c_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive Income</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest</link:label>
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    <link:label id="lab_fr_ThreeOneTwoFiveWilsonAvenueMember_f8014cf6-799c-49e1-b488-eab24dedb84e_terseLabel_en-US" xlink:label="lab_fr_ThreeOneTwoFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3125 Wilson Avenue</link:label>
    <link:label id="lab_fr_ThreeOneTwoFiveWilsonAvenueMember_label_en-US" xlink:label="lab_fr_ThreeOneTwoFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three One Two Five Wilson Avenue [Member]</link:label>
    <link:label id="lab_fr_ThreeOneTwoFiveWilsonAvenueMember_documentation_en-US" xlink:label="lab_fr_ThreeOneTwoFiveWilsonAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three One Two Five Wilson Avenue</link:label>
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    <link:label id="lab_us-gaap_OtherLongTermDebt_74c1112e-d525-4ea6-9a4f-df7ec4127c6d_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLongTermDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Term Loans, Net</link:label>
    <link:label id="lab_us-gaap_OtherLongTermDebt_label_en-US" xlink:label="lab_us-gaap_OtherLongTermDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long-Term Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLongTermDebt" xlink:to="lab_us-gaap_OtherLongTermDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember_9c486fe3-52b4-4f63-ac38-25915ebc5eea_terseLabel_en-US" xlink:label="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">14302 24th Street East Lot 1 [Member]</link:label>
    <link:label id="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember_label_en-US" xlink:label="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Three Zero Two Twenty Fourth Street East Lot One [Member]</link:label>
    <link:label id="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember_documentation_en-US" xlink:label="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Three Zero Two Twenty Fourth Street East Lot One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:href="fr-20251231.xsd#fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:to="lab_fr_OneFourThreeZeroTwoTwentyFourthStreetEastLotOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NoncontrollingInterestMember_8a62d69b-cf45-450a-a934-fd0c05969224_terseLabel_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_NoncontrollingInterestMember_916c3e2a-162e-4041-b25f-3d49723461d5_verboseLabel_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest [Member]</link:label>
    <link:label id="lab_us-gaap_NoncontrollingInterestMember_label_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncontrolling Interest [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncontrollingInterestMember" xlink:to="lab_us-gaap_NoncontrollingInterestMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PVThreeZeroThreeMember_04e04c18-b9e7-4a6e-9cfe-427318885847_terseLabel_en-US" xlink:label="lab_fr_PVThreeZeroThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PV 303</link:label>
    <link:label id="lab_fr_PVThreeZeroThreeMember_label_en-US" xlink:label="lab_fr_PVThreeZeroThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PV Three Zero Three [Member]</link:label>
    <link:label id="lab_fr_PVThreeZeroThreeMember_documentation_en-US" xlink:label="lab_fr_PVThreeZeroThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PV Three Zero Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PVThreeZeroThreeMember" xlink:href="fr-20251231.xsd#fr_PVThreeZeroThreeMember"/>
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    <link:label id="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember_5f228e7a-e9fb-4ec2-ac67-518781f236e0_terseLabel_en-US" xlink:label="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3895 Eastgate Blvd Bldg A [Member]</link:label>
    <link:label id="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember_label_en-US" xlink:label="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Nine Five Eastgate Blvd Bldg A [Member]</link:label>
    <link:label id="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember_documentation_en-US" xlink:label="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Nine Five Eastgate Blvd Bldg A [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:href="fr-20251231.xsd#fr_ThreeEightNineFiveEastgateBlvdBldgAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:to="lab_fr_ThreeEightNineFiveEastgateBlvdBldgAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquityMethodInvestmentsPolicy_19adf4a5-ce84-440e-9c84-5b4a57f9841e_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentsPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Joint Ventures</link:label>
    <link:label id="lab_us-gaap_EquityMethodInvestmentsPolicy_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentsPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investments [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityMethodInvestmentsPolicy" xlink:to="lab_us-gaap_EquityMethodInvestmentsPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_5fac6067-d8a7-46f4-a4c8-1051f4da568c_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Ownership Percentage</link:label>
    <link:label id="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Ownership Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:to="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_f4aafd76-0855-4356-96d5-9c482ee09c9b_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Numerator:</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Basic [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_8449e3bb-3095-44a5-b9c1-9b074a277f44_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember_d4a88e9b-5a05-4a7f-87a3-f55a43f40859_terseLabel_en-US" xlink:label="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">21730-21748 Marilla St. [Member]</link:label>
    <link:label id="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember_label_en-US" xlink:label="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two One Seven Three Zero To Two One Seven Four Eight Marilla St [Member]</link:label>
    <link:label id="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember_documentation_en-US" xlink:label="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two one seven three zero to two one seven four eight Marilla St.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:href="fr-20251231.xsd#fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:to="lab_fr_TwoOneSevenThreeZeroToTwoOneSevenFourEightMarillaStMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember_a93e5e33-e1c0-4b28-8a95-0074e326b0d8_terseLabel_en-US" xlink:label="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">555 W. Algonquin Rd [Member]</link:label>
    <link:label id="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember_label_en-US" xlink:label="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Hundred Fifty Five W Algonquin Rd [Member]</link:label>
    <link:label id="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember_documentation_en-US" xlink:label="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five hundred fifty five W Algonquin rd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:href="fr-20251231.xsd#fr_FiveHundredFiftyFiveWAlgonquinRdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:to="lab_fr_FiveHundredFiftyFiveWAlgonquinRdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PeoActuallyPaidCompAmt_terseLabel_en-US" xlink:label="lab_ecd_PeoActuallyPaidCompAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PEO Actually Paid Compensation Amount</link:label>
    <link:label id="lab_ecd_PeoActuallyPaidCompAmt_label_en-US" xlink:label="lab_ecd_PeoActuallyPaidCompAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PEO Actually Paid Compensation Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoActuallyPaidCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PeoActuallyPaidCompAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PeoActuallyPaidCompAmt" xlink:to="lab_ecd_PeoActuallyPaidCompAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareDilutedAbstract_59b3cbd4-ea45-481e-b4e0-e889ddf07ccb_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diluted Earnings Per Share / Unit:</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDilutedAbstract_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract" xlink:to="lab_us-gaap_EarningsPerShareDilutedAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourFiveEightEMissionBoulevardMember_2e7341cb-9f2e-435f-92c7-246a70863885_terseLabel_en-US" xlink:label="lab_fr_OneFourFiveEightEMissionBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1458 E. Mission Boulevard</link:label>
    <link:label id="lab_fr_OneFourFiveEightEMissionBoulevardMember_label_en-US" xlink:label="lab_fr_OneFourFiveEightEMissionBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Five Eight E Mission Boulevard [Member]</link:label>
    <link:label id="lab_fr_OneFourFiveEightEMissionBoulevardMember_documentation_en-US" xlink:label="lab_fr_OneFourFiveEightEMissionBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Five Eight E Mission Boulevard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourFiveEightEMissionBoulevardMember" xlink:href="fr-20251231.xsd#fr_OneFourFiveEightEMissionBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourFiveEightEMissionBoulevardMember" xlink:to="lab_fr_OneFourFiveEightEMissionBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember_27aafcc4-c965-47ad-851d-54a56d2b0c4e_terseLabel_en-US" xlink:label="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8801 NW 87th Avenue</link:label>
    <link:label id="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember_label_en-US" xlink:label="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Eight Zero One NW Eighty Seventh Avenue [Member]</link:label>
    <link:label id="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember_documentation_en-US" xlink:label="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Eight Zero One NW Eighty Seventh Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:href="fr-20251231.xsd#fr_EightEightZeroOneNWEightySeventhAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:to="lab_fr_EightEightZeroOneNWEightySeventhAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentFairValue_ff64c1e3-4549-4da8-bfb6-7e02c1165f64_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Term Loans</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFairValue_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFairValue" xlink:to="lab_us-gaap_DebtInstrumentFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourHundredOldPostRoadMember_dd721d4b-dcde-498d-95e9-1327f0cab30f_terseLabel_en-US" xlink:label="lab_fr_FourHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">400 Old Post Road [Member]</link:label>
    <link:label id="lab_fr_FourHundredOldPostRoadMember_label_en-US" xlink:label="lab_fr_FourHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Hundred Old Post Road [Member]</link:label>
    <link:label id="lab_fr_FourHundredOldPostRoadMember_documentation_en-US" xlink:label="lab_fr_FourHundredOldPostRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Hundred Old Post Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourHundredOldPostRoadMember" xlink:href="fr-20251231.xsd#fr_FourHundredOldPostRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourHundredOldPostRoadMember" xlink:to="lab_fr_FourHundredOldPostRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourFourFiveEngineerStreetMember_e4f5b295-9e61-4ea2-8317-e9f8e3dbc760_terseLabel_en-US" xlink:label="lab_fr_OneFourFourFiveEngineerStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1445 Engineer Street [Member]</link:label>
    <link:label id="lab_fr_OneFourFourFiveEngineerStreetMember_label_en-US" xlink:label="lab_fr_OneFourFourFiveEngineerStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Four Five Engineer Street [Member]</link:label>
    <link:label id="lab_fr_OneFourFourFiveEngineerStreetMember_documentation_en-US" xlink:label="lab_fr_OneFourFourFiveEngineerStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Four Five Engineer Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourFourFiveEngineerStreetMember" xlink:href="fr-20251231.xsd#fr_OneFourFourFiveEngineerStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourFourFiveEngineerStreetMember" xlink:to="lab_fr_OneFourFourFiveEngineerStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SaleableCompanyCommonStock_e939e68a-fbcc-48d4-889c-0158d5b71413_terseLabel_en-US" xlink:label="lab_fr_SaleableCompanyCommonStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares of company stock issuable under an at-the-market offering</link:label>
    <link:label id="lab_fr_SaleableCompanyCommonStock_label_en-US" xlink:label="lab_fr_SaleableCompanyCommonStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Saleable Company Common Stock</link:label>
    <link:label id="lab_fr_SaleableCompanyCommonStock_documentation_en-US" xlink:label="lab_fr_SaleableCompanyCommonStock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Saleable company common stock.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SaleableCompanyCommonStock" xlink:href="fr-20251231.xsd#fr_SaleableCompanyCommonStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SaleableCompanyCommonStock" xlink:to="lab_fr_SaleableCompanyCommonStock" xlink:type="arc" order="1"/>
    <link:label id="lab_stpr_CA_019c49ba-bbe8-7091-b9c4-57b2ca22cb7c_terseLabel_en-US" xlink:label="lab_stpr_CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CALIFORNIA</link:label>
    <link:label id="lab_stpr_CA_label_en-US" xlink:label="lab_stpr_CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CALIFORNIA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CA"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_stpr_CA" xlink:to="lab_stpr_CA" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_d0704f2f-e26d-47c1-9cbd-ae665f894fb5_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swaps, Number of Instruments Held</link:label>
    <link:label id="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_label_en-US" xlink:label="lab_us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Number of Instruments Held</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:to="lab_us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_b7056af8-8c70-4f18-b948-73f3541e3806_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_label_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeContractTypeDomain" xlink:to="lab_us-gaap_DerivativeContractTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_a37d85bc-e837-49f2-8b3f-576c24bbf95e_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from the Issuance of Common Stock/Contribution of General Partner Units</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_638d2a0a-951c-4bd7-8b86-9b6bc8f4db5e_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net proceeds from the issuance of common stock</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Common Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixSixFiveNBaldwinParkBlvdMember_a1493080-257e-4ffb-8c4a-b7dac5f619c5_terseLabel_en-US" xlink:label="lab_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">665 N. Baldwin Park Blvd [Member]</link:label>
    <link:label id="lab_fr_SixSixFiveNBaldwinParkBlvdMember_label_en-US" xlink:label="lab_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Six Five N Baldwin Park Blvd [Member]</link:label>
    <link:label id="lab_fr_SixSixFiveNBaldwinParkBlvdMember_documentation_en-US" xlink:label="lab_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six six five n Baldwin Park Blvd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:href="fr-20251231.xsd#fr_SixSixFiveNBaldwinParkBlvdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:to="lab_fr_SixSixFiveNBaldwinParkBlvdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember_9b36bd0c-4295-454c-bd25-2e51f5a9ed85_terseLabel_en-US" xlink:label="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029-2035 McKenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember_label_en-US" xlink:label="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Two Nine To Two Zero Three Five Mckenzie Drive [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember_documentation_en-US" xlink:label="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero two nine to two zero three five mckenzie drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:href="fr-20251231.xsd#fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:to="lab_fr_TwoZeroTwoNineToTwoZeroThreeFiveMckenzieDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7452aa9c-0604-4e14-b9b5-8626869f4ac2_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period of Awards issued</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIMember_37f37d01-cd56-4852-adad-3cddd993787c_terseLabel_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022 II Swaps</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIMember_label_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II) [Member]</link:label>
    <link:label id="lab_fr_InterestRateSwap2022SwapsIIMember_documentation_en-US" xlink:label="lab_fr_InterestRateSwap2022SwapsIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap (2022 Swaps II)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_InterestRateSwap2022SwapsIIMember" xlink:href="fr-20251231.xsd#fr_InterestRateSwap2022SwapsIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_InterestRateSwap2022SwapsIIMember" xlink:to="lab_fr_InterestRateSwap2022SwapsIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AllIndividualsMember_terseLabel_en-US" xlink:label="lab_ecd_AllIndividualsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Individuals</link:label>
    <link:label id="lab_ecd_AllIndividualsMember_label_en-US" xlink:label="lab_ecd_AllIndividualsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Individuals [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="lab_ecd_AllIndividualsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_da218ff7-4f7d-4108-8754-bc4bb469e63a_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Term Debt, Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain" xlink:to="lab_us-gaap_LongtermDebtTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_0b385030-a2e9-482f-bfe1-50ae3bd96d62_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract" xlink:to="lab_us-gaap_FairValueDisclosuresAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ForgoneRecoveryIndName_terseLabel_en-US" xlink:label="lab_ecd_ForgoneRecoveryIndName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name</link:label>
    <link:label id="lab_ecd_ForgoneRecoveryIndName_label_en-US" xlink:label="lab_ecd_ForgoneRecoveryIndName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forgone Recovery, Individual Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryIndName" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ForgoneRecoveryIndName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ForgoneRecoveryIndName" xlink:to="lab_ecd_ForgoneRecoveryIndName" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneFourZeroTwoPuyallupStreetMember_423f446d-2551-4680-a819-7c9fe93bdab1_terseLabel_en-US" xlink:label="lab_fr_OneFourZeroTwoPuyallupStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1402 Puyallup Street [Member]</link:label>
    <link:label id="lab_fr_OneFourZeroTwoPuyallupStreetMember_label_en-US" xlink:label="lab_fr_OneFourZeroTwoPuyallupStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Four Zero Two Puyallup Street [Member]</link:label>
    <link:label id="lab_fr_OneFourZeroTwoPuyallupStreetMember_documentation_en-US" xlink:label="lab_fr_OneFourZeroTwoPuyallupStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Four Zero Two Puyallup Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneFourZeroTwoPuyallupStreetMember" xlink:href="fr-20251231.xsd#fr_OneFourZeroTwoPuyallupStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneFourZeroTwoPuyallupStreetMember" xlink:to="lab_fr_OneFourZeroTwoPuyallupStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestPaidCapitalized_260b8b97-4234-4106-8f03-2a9136f2a8ef_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidCapitalized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Expense Capitalized in Connection with Development Activity</link:label>
    <link:label id="lab_us-gaap_InterestPaidCapitalized_label_en-US" xlink:label="lab_us-gaap_InterestPaidCapitalized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Capitalized, Investing Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidCapitalized" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidCapitalized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaidCapitalized" xlink:to="lab_us-gaap_InterestPaidCapitalized" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember_terseLabel_en-US" xlink:label="lab_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested</link:label>
    <link:label id="lab_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember_label_en-US" xlink:label="lab_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:to="lab_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroSevenFiveMidwayRoadMember_173d6f22-cd14-440d-82c5-db754002f107_terseLabel_en-US" xlink:label="lab_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2075 Midway Road</link:label>
    <link:label id="lab_fr_TwoZeroSevenFiveMidwayRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Seven Five Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroSevenFiveMidwayRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Seven Five Midway Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroSevenFiveMidwayRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:to="lab_fr_TwoZeroSevenFiveMidwayRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_8d880ce6-f7a8-467d-b351-610214b52869_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Loss</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:to="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_CapitalGainsAsPercentageForTheThreeYear_2333991c-7d7b-41a3-b792-9106fc42f0a2_terseLabel_en-US" xlink:label="lab_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital Gains as Percentage for the Three Year</link:label>
    <link:label id="lab_fr_CapitalGainsAsPercentageForTheThreeYear_label_en-US" xlink:label="lab_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Gains as Percentage for the Three Year</link:label>
    <link:label id="lab_fr_CapitalGainsAsPercentageForTheThreeYear_documentation_en-US" xlink:label="lab_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Gains as Percentage for the Three Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:href="fr-20251231.xsd#fr_CapitalGainsAsPercentageForTheThreeYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:to="lab_fr_CapitalGainsAsPercentageForTheThreeYear" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeZeroOneBordentownHeddingRoadMember_fb1ab681-88cb-4a53-a372-9441c08578d6_terseLabel_en-US" xlink:label="lab_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">301 Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroOneBordentownHeddingRoadMember_label_en-US" xlink:label="lab_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Zero One Bordentown Hedding Road [Member]</link:label>
    <link:label id="lab_fr_ThreeZeroOneBordentownHeddingRoadMember_documentation_en-US" xlink:label="lab_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Zero One Bordentown Hedding Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:href="fr-20251231.xsd#fr_ThreeZeroOneBordentownHeddingRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:to="lab_fr_ThreeZeroOneBordentownHeddingRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_fdd8dc5b-3527-419a-a0c4-bdec026f51d9_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Gain on Sale of Real Estate</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_2c294aac-8f31-4bba-92f8-a29baf6f06d2_verboseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gain on sale of real estate</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Properties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfProperties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfProperties" xlink:to="lab_us-gaap_GainLossOnSaleOfProperties" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ErrCompAnalysisTextBlock_terseLabel_en-US" xlink:label="lab_ecd_ErrCompAnalysisTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Erroneous Compensation Analysis</link:label>
    <link:label id="lab_ecd_ErrCompAnalysisTextBlock_label_en-US" xlink:label="lab_ecd_ErrCompAnalysisTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Erroneous Compensation Analysis [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ErrCompAnalysisTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ErrCompAnalysisTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ErrCompAnalysisTextBlock" xlink:to="lab_ecd_ErrCompAnalysisTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenFourSevenWGrandParkwayNMember_87cf7dfa-1927-40e1-81a1-0425ae76827a_terseLabel_en-US" xlink:label="lab_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2747 W Grand Parkway N [Member]</link:label>
    <link:label id="lab_fr_TwoSevenFourSevenWGrandParkwayNMember_label_en-US" xlink:label="lab_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Four Seven W Grand Parkway N [Member]</link:label>
    <link:label id="lab_fr_TwoSevenFourSevenWGrandParkwayNMember_documentation_en-US" xlink:label="lab_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Four Seven W Grand Parkway N [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:href="fr-20251231.xsd#fr_TwoSevenFourSevenWGrandParkwayNMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:to="lab_fr_TwoSevenFourSevenWGrandParkwayNMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_a1f4cb17-b630-4912-aa7a-b7fbfb06b4a4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Asset, Finite-Lived [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Asset, Finite-Lived [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeAverageFixedInterestRate_7d5285ab-bbcf-4f85-bc62-b68ef0220e8b_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAverageFixedInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swaps, Average Fixed Interest Rate</link:label>
    <link:label id="lab_us-gaap_DerivativeAverageFixedInterestRate_label_en-US" xlink:label="lab_us-gaap_DerivativeAverageFixedInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Average Fixed Interest Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAverageFixedInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAverageFixedInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAverageFixedInterestRate" xlink:to="lab_us-gaap_DerivativeAverageFixedInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_67093023-2f95-4519-a1fa-2cff358f5624_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="lab_us-gaap_LesseeLeaseDescriptionLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_Rule10b51ArrTrmntdFlag_terseLabel_en-US" xlink:label="lab_ecd_Rule10b51ArrTrmntdFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rule 10b5-1 Arrangement Terminated</link:label>
    <link:label id="lab_ecd_Rule10b51ArrTrmntdFlag_label_en-US" xlink:label="lab_ecd_Rule10b51ArrTrmntdFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rule 10b5-1 Arrangement Terminated [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Rule10b51ArrTrmntdFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrTrmntdFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_Rule10b51ArrTrmntdFlag" xlink:to="lab_ecd_Rule10b51ArrTrmntdFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation_09c1cf5a-a02e-47f2-a5b9-b6ffc6e41448_terseLabel_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Held for Sale - Other Assets Accumulated Depreciation</link:label>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation_label_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule III Real Estate Held for Sale Other Assets Accumulated Depreciation</link:label>
    <link:label id="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation_documentation_en-US" xlink:label="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule III Real Estate Held for Sale Other Assets Accumulated Depreciation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:href="fr-20251231.xsd#fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:to="lab_fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenZeroFiveOneWestBroadwayMember_7f02d9dc-ee4e-46d7-b148-d780ef1b254d_terseLabel_en-US" xlink:label="lab_fr_SevenZeroFiveOneWestBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7051 West Broadway [Member]</link:label>
    <link:label id="lab_fr_SevenZeroFiveOneWestBroadwayMember_label_en-US" xlink:label="lab_fr_SevenZeroFiveOneWestBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Zero Five One West Broadway [Member]</link:label>
    <link:label id="lab_fr_SevenZeroFiveOneWestBroadwayMember_documentation_en-US" xlink:label="lab_fr_SevenZeroFiveOneWestBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7051 West Broadway [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenZeroFiveOneWestBroadwayMember" xlink:href="fr-20251231.xsd#fr_SevenZeroFiveOneWestBroadwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenZeroFiveOneWestBroadwayMember" xlink:to="lab_fr_SevenZeroFiveOneWestBroadwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_a870c7e2-0660-412e-99c5-dd179865868e_terseLabel_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Partner Type of Partners' Capital Account, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_label_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partner Type of Partners' Capital Account, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:to="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightSevenOneSixWLudlowDriveMember_cb158adc-238f-4591-ae67-023dc301116c_terseLabel_en-US" xlink:label="lab_fr_EightSevenOneSixWLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8716 W. Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSevenOneSixWLudlowDriveMember_label_en-US" xlink:label="lab_fr_EightSevenOneSixWLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Seven One Six W Ludlow Drive [Member]</link:label>
    <link:label id="lab_fr_EightSevenOneSixWLudlowDriveMember_documentation_en-US" xlink:label="lab_fr_EightSevenOneSixWLudlowDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight seven one six W Ludlow Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightSevenOneSixWLudlowDriveMember" xlink:href="fr-20251231.xsd#fr_EightSevenOneSixWLudlowDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightSevenOneSixWLudlowDriveMember" xlink:to="lab_fr_EightSevenOneSixWLudlowDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_64538420-178a-4989-85c6-08df3f8f16ee_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Net Income Allocable to Participating Securities</link:label>
    <link:label id="lab_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_label_en-US" xlink:label="lab_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Participating Securities, Distributed and Undistributed Earnings (Loss), Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:to="lab_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ErrCompRecoveryTable_terseLabel_en-US" xlink:label="lab_ecd_ErrCompRecoveryTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Erroneously Awarded Compensation Recovery</link:label>
    <link:label id="lab_ecd_ErrCompRecoveryTable_label_en-US" xlink:label="lab_ecd_ErrCompRecoveryTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Erroneously Awarded Compensation Recovery [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ErrCompRecoveryTable" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ErrCompRecoveryTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ErrCompRecoveryTable" xlink:to="lab_ecd_ErrCompRecoveryTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeZeroOneNottinghamDriveMember_08ce496e-6931-455b-8305-385688804d2b_terseLabel_en-US" xlink:label="lab_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5301 Nottingham Drive [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneNottinghamDriveMember_label_en-US" xlink:label="lab_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Zero One Nottingham Drive [Member]</link:label>
    <link:label id="lab_fr_FiveThreeZeroOneNottinghamDriveMember_documentation_en-US" xlink:label="lab_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Three Zero One Nottingham Drive</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:href="fr-20251231.xsd#fr_FiveThreeZeroOneNottinghamDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:to="lab_fr_FiveThreeZeroOneNottinghamDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_6f946b09-7b70-4fed-b435-8dba38371ac1_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember_58266585-5325-49d9-8074-8f63e4a419a9_terseLabel_en-US" xlink:label="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">24901 San Michele Road [Member]</link:label>
    <link:label id="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember_label_en-US" xlink:label="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Nine Zero One San Michele Road [Member]</link:label>
    <link:label id="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember_documentation_en-US" xlink:label="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Nine Zero One San Michele Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:href="fr-20251231.xsd#fr_TwoFourNineZeroOneSanMicheleRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:to="lab_fr_TwoFourNineZeroOneSanMicheleRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_36a2e992-9980-47d3-aa27-966040b682bd_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Table]</link:label>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Lease, Description [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable" xlink:to="lab_us-gaap_LesseeLeaseDescriptionTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember_7e4179ac-c8a7-4fa3-81d2-afb8b6fd40eb_terseLabel_en-US" xlink:label="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3821 Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember_label_en-US" xlink:label="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Two One Ocean Ranch Boulevard [Member]</link:label>
    <link:label id="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember_documentation_en-US" xlink:label="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Two One Ocean Ranch Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:href="fr-20251231.xsd#fr_ThreeEightTwoOneOceanRanchBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:to="lab_fr_ThreeEightTwoOneOceanRanchBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember_db0dd335-25b6-4d9e-9e5d-101cfa973df8_terseLabel_en-US" xlink:label="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">825-827 Avenue H [Member]</link:label>
    <link:label id="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember_label_en-US" xlink:label="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Two Five Eight Two Seven Avenue H D [Member]</link:label>
    <link:label id="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember_documentation_en-US" xlink:label="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Two Five Eight Two Seven Avenue H D [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:href="fr-20251231.xsd#fr_EightTwoFiveEightTwoSevenAvenueHDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:to="lab_fr_EightTwoFiveEightTwoSevenAvenueHDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveThreeFiveSixEPonceDeLeonMember_d9124016-f7f6-41eb-bf82-f92063072ae0_terseLabel_en-US" xlink:label="lab_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5356 E. Ponce De Leon [Member]</link:label>
    <link:label id="lab_fr_FiveThreeFiveSixEPonceDeLeonMember_label_en-US" xlink:label="lab_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Three Five Six E Ponce De Leon [Member]</link:label>
    <link:label id="lab_fr_FiveThreeFiveSixEPonceDeLeonMember_documentation_en-US" xlink:label="lab_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five three five six e Ponce De Leon.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:href="fr-20251231.xsd#fr_FiveThreeFiveSixEPonceDeLeonMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:to="lab_fr_FiveThreeFiveSixEPonceDeLeonMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_AggregateGrossSaleProceeds_7a26b128-0614-4897-818a-f17099058638_terseLabel_en-US" xlink:label="lab_fr_AggregateGrossSaleProceeds" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Gross Sale Proceeds</link:label>
    <link:label id="lab_fr_AggregateGrossSaleProceeds_label_en-US" xlink:label="lab_fr_AggregateGrossSaleProceeds" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Gross Sale Proceeds</link:label>
    <link:label id="lab_fr_AggregateGrossSaleProceeds_documentation_en-US" xlink:label="lab_fr_AggregateGrossSaleProceeds" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The aggregate offering price of the distribution agreement for the at-the-market offering.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_AggregateGrossSaleProceeds" xlink:href="fr-20251231.xsd#fr_AggregateGrossSaleProceeds"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_AggregateGrossSaleProceeds" xlink:to="lab_fr_AggregateGrossSaleProceeds" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember_29298c19-1730-47fd-97e1-ba21683730b9_terseLabel_en-US" xlink:label="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">27426 Pioneer Avenue</link:label>
    <link:label id="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember_label_en-US" xlink:label="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Four Two Six Pioneer Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Four Two Six Pioneer Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoSevenFourTwoSixPioneerAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:to="lab_fr_TwoSevenFourTwoSixPioneerAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneTwoBordnersvilleRoadMember_29a9ecd4-1ea9-42df-b61f-924c4f6e37bb_terseLabel_en-US" xlink:label="lab_fr_OneOneTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">112 Bordnersville Road [Member]</link:label>
    <link:label id="lab_fr_OneOneTwoBordnersvilleRoadMember_label_en-US" xlink:label="lab_fr_OneOneTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Two Bordnersville Road [Member]</link:label>
    <link:label id="lab_fr_OneOneTwoBordnersvilleRoadMember_documentation_en-US" xlink:label="lab_fr_OneOneTwoBordnersvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One One Two Bordnersville Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneTwoBordnersvilleRoadMember" xlink:href="fr-20251231.xsd#fr_OneOneTwoBordnersvilleRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneTwoBordnersvilleRoadMember" xlink:to="lab_fr_OneOneTwoBordnersvilleRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember_d3aedd8f-57eb-4e01-a9f9-654be2733623_terseLabel_en-US" xlink:label="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4700 NW 15th Ave [Member]</link:label>
    <link:label id="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember_label_en-US" xlink:label="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Seven Zero Zero Nw One Five Avenue [Member]</link:label>
    <link:label id="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember_documentation_en-US" xlink:label="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four seven zero zero nw one five avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:href="fr-20251231.xsd#fr_FourSevenZeroZeroNwOneFiveAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:to="lab_fr_FourSevenZeroZeroNwOneFiveAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_51610622-b350-41e4-8b5f-77ec02812cc7_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareAbstract" xlink:to="lab_us-gaap_EarningsPerShareAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightTwoFiveOneLibertyRoadMember_019c4899-6523-7917-a1f6-c817eb0eb18e_terseLabel_en-US" xlink:label="lab_fr_EightTwoFiveOneLibertyRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8251 Liberty Road</link:label>
    <link:label id="lab_fr_EightTwoFiveOneLibertyRoadMember_label_en-US" xlink:label="lab_fr_EightTwoFiveOneLibertyRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Two Five One Liberty Road [Member]</link:label>
    <link:label id="lab_fr_EightTwoFiveOneLibertyRoadMember_documentation_en-US" xlink:label="lab_fr_EightTwoFiveOneLibertyRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Two Five One Liberty Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightTwoFiveOneLibertyRoadMember" xlink:href="fr-20251231.xsd#fr_EightTwoFiveOneLibertyRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightTwoFiveOneLibertyRoadMember" xlink:to="lab_fr_EightTwoFiveOneLibertyRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8479c1d1-e14e-4db0-8f41-5653f88114f0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_50013395-b59f-45a1-a05b-05744078318d_totalLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Other Income (Expense)</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_ac684e89-8452-4fa7-89a6-b2b061ac9ca1_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense" xlink:to="lab_us-gaap_NonoperatingIncomeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByParent_36fb13af-462d-425e-8bdb-60f8bd85460c_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Company's ownership interest</link:label>
    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByParent_label_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiary, Ownership Percentage, Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:to="lab_us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_da188acc-eaa5-4998-8d63-01fe6446c70c_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Distributions from the Joint Venture</link:label>
    <link:label id="lab_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_label_en-US" xlink:label="lab_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Equity Method Investment, Distribution, Return of Capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:to="lab_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenEightZeroOneAvenueScottMember_50c63261-9107-43ec-808d-68275d62517d_terseLabel_en-US" xlink:label="lab_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">27801 Avenue Scott [Member]</link:label>
    <link:label id="lab_fr_TwoSevenEightZeroOneAvenueScottMember_label_en-US" xlink:label="lab_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Eight Zero One Avenue Scott [Member]</link:label>
    <link:label id="lab_fr_TwoSevenEightZeroOneAvenueScottMember_documentation_en-US" xlink:label="lab_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two seven eight zero one Avenue Scott.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:href="fr-20251231.xsd#fr_TwoSevenEightZeroOneAvenueScottMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:to="lab_fr_TwoSevenEightZeroOneAvenueScottMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TenantImprovementsFundedByTenant_d299e279-24a8-43ab-b7bb-3f7658af4e85_terseLabel_en-US" xlink:label="lab_fr_TenantImprovementsFundedByTenant" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Improvements Funded by Tenant</link:label>
    <link:label id="lab_fr_TenantImprovementsFundedByTenant_label_en-US" xlink:label="lab_fr_TenantImprovementsFundedByTenant" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tenant Improvements Funded By Tenant</link:label>
    <link:label id="lab_fr_TenantImprovementsFundedByTenant_documentation_en-US" xlink:label="lab_fr_TenantImprovementsFundedByTenant" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tenant Improvements Funded By Tenant</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TenantImprovementsFundedByTenant" xlink:href="fr-20251231.xsd#fr_TenantImprovementsFundedByTenant"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TenantImprovementsFundedByTenant" xlink:to="lab_fr_TenantImprovementsFundedByTenant" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_b5643a63-4819-4d76-b0e1-f2c4546728be_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reallocation&#8212;Additional Paid-in Capital</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneOneFourOneFiveOldRoswellRoadMember_d5ce14a8-d326-4631-9311-4ec2177d596b_terseLabel_en-US" xlink:label="lab_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">11415 Old Roswell Road [Member]</link:label>
    <link:label id="lab_fr_OneOneFourOneFiveOldRoswellRoadMember_label_en-US" xlink:label="lab_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One One Four One Five Old Roswell Road [Member]</link:label>
    <link:label id="lab_fr_OneOneFourOneFiveOldRoswellRoadMember_documentation_en-US" xlink:label="lab_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One one four one five Old Roswell Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:href="fr-20251231.xsd#fr_OneOneFourOneFiveOldRoswellRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:to="lab_fr_OneOneFourOneFiveOldRoswellRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_IncomeTaxTable_c4d4bc8a-726a-4418-917b-10129154d096_terseLabel_en-US" xlink:label="lab_fr_IncomeTaxTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax [Table]</link:label>
    <link:label id="lab_fr_IncomeTaxTable_label_en-US" xlink:label="lab_fr_IncomeTaxTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax [Table]</link:label>
    <link:label id="lab_fr_IncomeTaxTable_documentation_en-US" xlink:label="lab_fr_IncomeTaxTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income Tax [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncomeTaxTable" xlink:href="fr-20251231.xsd#fr_IncomeTaxTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_IncomeTaxTable" xlink:to="lab_fr_IncomeTaxTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroOneThreeThreeOneAvenueMMember_33174633-d826-4917-ad2f-3b1415a09f36_terseLabel_en-US" xlink:label="lab_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1013-31 Avenue M [Member]</link:label>
    <link:label id="lab_fr_OneZeroOneThreeThreeOneAvenueMMember_label_en-US" xlink:label="lab_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero One Three Three One Avenue M [Member]</link:label>
    <link:label id="lab_fr_OneZeroOneThreeThreeOneAvenueMMember_documentation_en-US" xlink:label="lab_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero One Three Three One Avenue M.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:href="fr-20251231.xsd#fr_OneZeroOneThreeThreeOneAvenueMMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:to="lab_fr_OneZeroOneThreeThreeOneAvenueMMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember_93f6f511-f703-4456-8ee9-5b62e659db4a_terseLabel_en-US" xlink:label="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">12925 Marlay Avenue [Member]</link:label>
    <link:label id="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember_label_en-US" xlink:label="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Two Nine Two Five Marlay Avenue [Member]</link:label>
    <link:label id="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember_documentation_en-US" xlink:label="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One two nine two five Marlay Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:href="fr-20251231.xsd#fr_OneTwoNineTwoFiveMarlayAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:to="lab_fr_OneTwoNineTwoFiveMarlayAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember_ab0fd470-2ed4-4b04-8cc7-de36e0e51917_terseLabel_en-US" xlink:label="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4051 Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember_label_en-US" xlink:label="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Zero Five One Southmeadow Parkway [Member]</link:label>
    <link:label id="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember_documentation_en-US" xlink:label="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four zero five one southmeadow parkway.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:href="fr-20251231.xsd#fr_FourZeroFiveOneSouthmeadowParkwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:to="lab_fr_FourZeroFiveOneSouthmeadowParkwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureDevelopmentServicesExpense_5b2f0337-9133-40d1-a9d0-86404fa569bf_terseLabel_en-US" xlink:label="lab_fr_JointVentureDevelopmentServicesExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Development Services Expense</link:label>
    <link:label id="lab_fr_JointVentureDevelopmentServicesExpense_label_en-US" xlink:label="lab_fr_JointVentureDevelopmentServicesExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Development Services Expense</link:label>
    <link:label id="lab_fr_JointVentureDevelopmentServicesExpense_documentation_en-US" xlink:label="lab_fr_JointVentureDevelopmentServicesExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Development Services Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureDevelopmentServicesExpense" xlink:href="fr-20251231.xsd#fr_JointVentureDevelopmentServicesExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureDevelopmentServicesExpense" xlink:to="lab_fr_JointVentureDevelopmentServicesExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember_be5ba2cb-0b7c-44d4-8a0a-5cd80da3da6c_terseLabel_en-US" xlink:label="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10707 Gilroy Road [Member]</link:label>
    <link:label id="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember_label_en-US" xlink:label="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ten Thousand Seven Hundred Seven Gilroy Road [Member]</link:label>
    <link:label id="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember_documentation_en-US" xlink:label="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ten thousand seven hundred seven Gilroy Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:href="fr-20251231.xsd#fr_TenThousandSevenHundredSevenGilroyRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:to="lab_fr_TenThousandSevenHundredSevenGilroyRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_AwardTmgDiscLineItems_label_en-US" xlink:label="lab_ecd_AwardTmgDiscLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Timing Disclosures [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgDiscLineItems" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AwardTmgDiscLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="lab_ecd_AwardTmgDiscLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_EightFiveSevenTwoSpectrumLaneMember_39a6a4af-c421-4ce4-b125-f2d3e2138d91_terseLabel_en-US" xlink:label="lab_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8572 Spectrum Lane [Member]</link:label>
    <link:label id="lab_fr_EightFiveSevenTwoSpectrumLaneMember_label_en-US" xlink:label="lab_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Five Seven Two Spectrum Lane [Member]</link:label>
    <link:label id="lab_fr_EightFiveSevenTwoSpectrumLaneMember_documentation_en-US" xlink:label="lab_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Five Seven Two Spectrum Lane [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:href="fr-20251231.xsd#fr_EightFiveSevenTwoSpectrumLaneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:to="lab_fr_EightFiveSevenTwoSpectrumLaneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LeaseAgreementsMember_518edf84-a589-4bd6-bbab-b4a17c704f28_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAgreementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Below Market Ground Lease Obligation</link:label>
    <link:label id="lab_us-gaap_LeaseAgreementsMember_label_en-US" xlink:label="lab_us-gaap_LeaseAgreementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Agreements [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAgreementsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseAgreementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseAgreementsMember" xlink:to="lab_us-gaap_LeaseAgreementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_14e58708-7b6f-4a2b-bee6-0bc46fb1b783_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain" xlink:to="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenZeroOneNMarketStreetMember_3c1aa4c6-22b1-4141-940c-427fcc649ba2_terseLabel_en-US" xlink:label="lab_fr_TwoSevenZeroOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2701 N. Market Street</link:label>
    <link:label id="lab_fr_TwoSevenZeroOneNMarketStreetMember_label_en-US" xlink:label="lab_fr_TwoSevenZeroOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Zero One N Market Street [Member]</link:label>
    <link:label id="lab_fr_TwoSevenZeroOneNMarketStreetMember_documentation_en-US" xlink:label="lab_fr_TwoSevenZeroOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Zero One N Market Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenZeroOneNMarketStreetMember" xlink:href="fr-20251231.xsd#fr_TwoSevenZeroOneNMarketStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenZeroOneNMarketStreetMember" xlink:to="lab_fr_TwoSevenZeroOneNMarketStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_6e77debf-b730-44be-a56e-0756783faee7_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Before Reclassifications</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), before Reclassifications, Net of Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_de364647-2d2d-47ce-98bd-225f00f23b16_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity of the Company and Partners' Capital of the Operating Partnership</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_85e7c4e2-4b27-4a90-a04d-3c3a6f3c0bee_terseLabel_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Partner Type [Axis]</link:label>
    <link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_label_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partner Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:to="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_cd1a6668-9cf8-4a6f-804e-3653e4b8f707_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">State</link:label>
    <link:label id="lab_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_label_en-US" xlink:label="lab_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred State and Local Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:to="lab_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneNineSixZeroWeaversvilleRoadMember_8397830d-e5d9-4138-a5d2-0b76fad918d5_terseLabel_en-US" xlink:label="lab_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1960 Weaversville Road</link:label>
    <link:label id="lab_fr_OneNineSixZeroWeaversvilleRoadMember_label_en-US" xlink:label="lab_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Nine Six Zero Weaversville Road [Member]</link:label>
    <link:label id="lab_fr_OneNineSixZeroWeaversvilleRoadMember_documentation_en-US" xlink:label="lab_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Nine Six Zero Weaversville Road</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:href="fr-20251231.xsd#fr_OneNineSixZeroWeaversvilleRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:to="lab_fr_OneNineSixZeroWeaversvilleRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember_194a9bc4-7b24-4527-a50e-85dba56c9361_terseLabel_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2032 Notes</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember_label_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due Two Thousand Thirty Two Notes [Member]</link:label>
    <link:label id="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember_documentation_en-US" xlink:label="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior notes due two thousand thirty two notes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:href="fr-20251231.xsd#fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:to="lab_fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetIncomeLoss_2b338ec2-ae74-4e5a-ad8a-d16d1d6e3d3d_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Income Available to Common Stockholders / Unitholders and Participating Securities</link:label>
    <link:label id="lab_us-gaap_NetIncomeLoss_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss" xlink:to="lab_us-gaap_NetIncomeLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventTable_1e91a402-45e3-4dcd-a8b1-74f3db7198ca_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event [Table]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTable_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTable" xlink:to="lab_us-gaap_SubsequentEventTable" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_CommissionToSalesAgent_ebee9ef2-dc01-43e9-bfd5-e46a328b1737_terseLabel_en-US" xlink:label="lab_fr_CommissionToSalesAgent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commission To Sales Agent</link:label>
    <link:label id="lab_fr_CommissionToSalesAgent_label_en-US" xlink:label="lab_fr_CommissionToSalesAgent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commission To Sales Agent</link:label>
    <link:label id="lab_fr_CommissionToSalesAgent_documentation_en-US" xlink:label="lab_fr_CommissionToSalesAgent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commission To Sales Agent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_CommissionToSalesAgent" xlink:href="fr-20251231.xsd#fr_CommissionToSalesAgent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_CommissionToSalesAgent" xlink:to="lab_fr_CommissionToSalesAgent" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneEightZeroFiveTurningBasinDriveMember_5721fce8-2ee5-41d9-9706-bfffa187aa53_terseLabel_en-US" xlink:label="lab_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1805 Turning Basin Dr [Member]</link:label>
    <link:label id="lab_fr_OneEightZeroFiveTurningBasinDriveMember_label_en-US" xlink:label="lab_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Eight Zero Five Turning Basin Drive [Member]</link:label>
    <link:label id="lab_fr_OneEightZeroFiveTurningBasinDriveMember_documentation_en-US" xlink:label="lab_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One eight zero five Turning Basin Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:href="fr-20251231.xsd#fr_OneEightZeroFiveTurningBasinDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:to="lab_fr_OneEightZeroFiveTurningBasinDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNet_2d313a25-c3d8-4d3b-aec9-edbe082a7c57_totalLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNet" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Investment in Real Estate</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNet_1a94d573-0002-484b-995b-8936473cd7c4_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Investment in Real Estate</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNet_3f5d4bc1-b4ae-4fef-b408-92a71398edb7_verboseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNet" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net Investment in Real Estate</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNet_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateInvestmentPropertyNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateInvestmentPropertyNet" xlink:to="lab_us-gaap_RealEstateInvestmentPropertyNet" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateGrossAtCarryingValue_854e42a4-8b1a-4946-89cf-fa955eee43cf_totalLabel_en-US" xlink:label="lab_us-gaap_RealEstateGrossAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_RealEstateGrossAtCarryingValue_label_en-US" xlink:label="lab_us-gaap_RealEstateGrossAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateGrossAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateGrossAtCarryingValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateGrossAtCarryingValue" xlink:to="lab_us-gaap_RealEstateGrossAtCarryingValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PreferredStockSharesAuthorized_e851c0ce-07fe-4d95-bb66-3b7b1b434709_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Preferred Stock, Shares Authorized</link:label>
    <link:label id="lab_us-gaap_PreferredStockSharesAuthorized_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Shares Authorized</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PreferredStockSharesAuthorized" xlink:to="lab_us-gaap_PreferredStockSharesAuthorized" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrAdoptionDate_terseLabel_en-US" xlink:label="lab_ecd_TrdArrAdoptionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adoption Date</link:label>
    <link:label id="lab_ecd_TrdArrAdoptionDate_label_en-US" xlink:label="lab_ecd_TrdArrAdoptionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement Adoption Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrAdoptionDate" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrAdoptionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrAdoptionDate" xlink:to="lab_ecd_TrdArrAdoptionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PriorPeriodReclassificationAdjustmentDescription_637bb258-13d7-49bd-b889-693019dfff92_terseLabel_en-US" xlink:label="lab_us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassifications</link:label>
    <link:label id="lab_us-gaap_PriorPeriodReclassificationAdjustmentDescription_label_en-US" xlink:label="lab_us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification, Comparability Adjustment [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PriorPeriodReclassificationAdjustmentDescription"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:to="lab_us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroZeroFiveSigmanRoadMember_f5a4e8ec-7286-49ea-bd24-8564ba4713b0_terseLabel_en-US" xlink:label="lab_fr_OneZeroZeroFiveSigmanRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1005 Sigman Road [Member]</link:label>
    <link:label id="lab_fr_OneZeroZeroFiveSigmanRoadMember_label_en-US" xlink:label="lab_fr_OneZeroZeroFiveSigmanRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Zero Five Sigman Road [Member]</link:label>
    <link:label id="lab_fr_OneZeroZeroFiveSigmanRoadMember_documentation_en-US" xlink:label="lab_fr_OneZeroZeroFiveSigmanRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One zero zero five sigman road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroZeroFiveSigmanRoadMember" xlink:href="fr-20251231.xsd#fr_OneZeroZeroFiveSigmanRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroZeroFiveSigmanRoadMember" xlink:to="lab_fr_OneZeroZeroFiveSigmanRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeOneOneOneWestCommerceMember_50792cbb-a2e1-4f51-8ca2-87f25d2b21f8_terseLabel_en-US" xlink:label="lab_fr_ThreeOneOneOneWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3111 West Commerce Street [Member]</link:label>
    <link:label id="lab_fr_ThreeOneOneOneWestCommerceMember_label_en-US" xlink:label="lab_fr_ThreeOneOneOneWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three One One One West Commerce [Member]</link:label>
    <link:label id="lab_fr_ThreeOneOneOneWestCommerceMember_documentation_en-US" xlink:label="lab_fr_ThreeOneOneOneWestCommerceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three One One One West Commerce.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeOneOneOneWestCommerceMember" xlink:href="fr-20251231.xsd#fr_ThreeOneOneOneWestCommerceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeOneOneOneWestCommerceMember" xlink:to="lab_fr_ThreeOneOneOneWestCommerceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseTermOfContract_7727aa7d-d727-4afa-8b2f-aa5609edb088_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseTermOfContract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Remaining Lease Terms for Office Leases</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseTermOfContract_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseTermOfContract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Term of Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseTermOfContract" xlink:to="lab_us-gaap_LesseeOperatingLeaseTermOfContract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RealEstateImprovements_dc636f23-27f1-44f5-985b-d97c6d3aabce_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateImprovements" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction Costs and Improvements</link:label>
    <link:label id="lab_us-gaap_RealEstateImprovements_label_en-US" xlink:label="lab_us-gaap_RealEstateImprovements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateImprovements" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateImprovements"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateImprovements" xlink:to="lab_us-gaap_RealEstateImprovements" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember_6b078ae4-b588-4639-aa23-cccae02a78d4_terseLabel_en-US" xlink:label="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7050 Winnetka Avenue North [Member]</link:label>
    <link:label id="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember_label_en-US" xlink:label="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Zero Five Zero Winnetka Avenue North [Member]</link:label>
    <link:label id="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember_documentation_en-US" xlink:label="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">7050 Winnetka Avenue North [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:href="fr-20251231.xsd#fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:to="lab_fr_SevenZeroFiveZeroWinnetkaAvenueNorthMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CustomerRelationshipsMember_b59ccb57-7590-487c-a465-bdd9243b9c4c_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tenant Relationships</link:label>
    <link:label id="lab_us-gaap_CustomerRelationshipsMember_label_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Relationships [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CustomerRelationshipsMember" xlink:to="lab_us-gaap_CustomerRelationshipsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditMember_f67029f2-3d35-49b0-9a9d-339e4631812c_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Credit Facility</link:label>
    <link:label id="lab_us-gaap_LineOfCreditMember_label_en-US" xlink:label="lab_us-gaap_LineOfCreditMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditMember" xlink:to="lab_us-gaap_LineOfCreditMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsToAcquireRealEstate_67940bbf-5c77-4c10-bfd3-e5eb62473c36_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireRealEstate" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisitions of Real Estate</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireRealEstate_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireRealEstate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Real Estate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireRealEstate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireRealEstate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireRealEstate" xlink:to="lab_us-gaap_PaymentsToAcquireRealEstate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_3ab3dd7d-d775-4c59-891d-6d0dcf138e1c_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained Earnings</link:label>
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="lab_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixFourZeroZeroLongPointMember_722ac5fb-9baf-419f-8333-325b427c5a30_terseLabel_en-US" xlink:label="lab_fr_SixFourZeroZeroLongPointMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6400 Long Point [Member]</link:label>
    <link:label id="lab_fr_SixFourZeroZeroLongPointMember_label_en-US" xlink:label="lab_fr_SixFourZeroZeroLongPointMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Four Zero Zero Long Point [Member]</link:label>
    <link:label id="lab_fr_SixFourZeroZeroLongPointMember_documentation_en-US" xlink:label="lab_fr_SixFourZeroZeroLongPointMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6400 long point.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixFourZeroZeroLongPointMember" xlink:href="fr-20251231.xsd#fr_SixFourZeroZeroLongPointMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixFourZeroZeroLongPointMember" xlink:to="lab_fr_SixFourZeroZeroLongPointMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_8fccd5f8-f541-49a3-8377-f7e2b822a8ff_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Property [Axis]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Name of Property [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember_8bce2050-1012-45a2-985a-2b8c4560296e_terseLabel_en-US" xlink:label="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6301 Hazeltine National Drive [Member]</link:label>
    <link:label id="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember_label_en-US" xlink:label="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Three Zero One Hazeltine National Drive [Member]</link:label>
    <link:label id="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember_documentation_en-US" xlink:label="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six three zero one hazeltine national drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:href="fr-20251231.xsd#fr_SixThreeZeroOneHazeltineNationalDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:to="lab_fr_SixThreeZeroOneHazeltineNationalDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FourThirtyOneRailroadAvenueMember_4e3db6c0-0515-4d89-9d45-e076a3e23e9a_terseLabel_en-US" xlink:label="lab_fr_FourThirtyOneRailroadAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">431 Railroad Avenue [Member]</link:label>
    <link:label id="lab_fr_FourThirtyOneRailroadAvenueMember_label_en-US" xlink:label="lab_fr_FourThirtyOneRailroadAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Thirty One Railroad Avenue [Member]</link:label>
    <link:label id="lab_fr_FourThirtyOneRailroadAvenueMember_documentation_en-US" xlink:label="lab_fr_FourThirtyOneRailroadAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four thirty one railroad avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FourThirtyOneRailroadAvenueMember" xlink:href="fr-20251231.xsd#fr_FourThirtyOneRailroadAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FourThirtyOneRailroadAvenueMember" xlink:to="lab_fr_FourThirtyOneRailroadAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_JointVentureBuildingCMember_019c4515-cbd9-7be1-8c47-9d27a09ab1a4_terseLabel_en-US" xlink:label="lab_fr_JointVentureBuildingCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Joint Venture Building C</link:label>
    <link:label id="lab_fr_JointVentureBuildingCMember_label_en-US" xlink:label="lab_fr_JointVentureBuildingCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture Building C [Member]</link:label>
    <link:label id="lab_fr_JointVentureBuildingCMember_documentation_en-US" xlink:label="lab_fr_JointVentureBuildingCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture Building C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_JointVentureBuildingCMember" xlink:href="fr-20251231.xsd#fr_JointVentureBuildingCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_JointVentureBuildingCMember" xlink:to="lab_fr_JointVentureBuildingCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenSevenOneNMarketStreetMember_87367f0a-5546-4e0c-b023-1f8010155504_terseLabel_en-US" xlink:label="lab_fr_TwoSevenSevenOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2771 N. Market Street</link:label>
    <link:label id="lab_fr_TwoSevenSevenOneNMarketStreetMember_label_en-US" xlink:label="lab_fr_TwoSevenSevenOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Seven One N Market Street [Member]</link:label>
    <link:label id="lab_fr_TwoSevenSevenOneNMarketStreetMember_documentation_en-US" xlink:label="lab_fr_TwoSevenSevenOneNMarketStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Seven One N Market Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenSevenOneNMarketStreetMember" xlink:href="fr-20251231.xsd#fr_TwoSevenSevenOneNMarketStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenSevenOneNMarketStreetMember" xlink:to="lab_fr_TwoSevenSevenOneNMarketStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_A2026UnsecuredTermLoanMember_019c4916-ce36-70c9-a62c-cd209fab2d35_terseLabel_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan</link:label>
    <link:label id="lab_fr_A2026UnsecuredTermLoanMember_label_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan [Member]</link:label>
    <link:label id="lab_fr_A2026UnsecuredTermLoanMember_documentation_en-US" xlink:label="lab_fr_A2026UnsecuredTermLoanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2026 Unsecured Term Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_A2026UnsecuredTermLoanMember" xlink:href="fr-20251231.xsd#fr_A2026UnsecuredTermLoanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_A2026UnsecuredTermLoanMember" xlink:to="lab_fr_A2026UnsecuredTermLoanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember_terseLabel_en-US" xlink:label="lab_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested</link:label>
    <link:label id="lab_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember_label_en-US" xlink:label="lab_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:to="lab_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementClassOfStockAxis_d1a5e334-9481-4a3e-81a8-373c35b48b6b_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementClassOfStockAxis_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementClassOfStockAxis" xlink:to="lab_us-gaap_StatementClassOfStockAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c45a8-4f80-7e0a-844f-500b36ed2efe_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instruments</link:label>
    <link:label id="lab_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_label_en-US" xlink:label="lab_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:to="lab_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventTypeDomain_09dc6347-5720-4843-bc9d-c6fbef3ab29d_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Domain]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTypeDomain_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTypeDomain" xlink:to="lab_us-gaap_SubsequentEventTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember_terseLabel_en-US" xlink:label="lab_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table</link:label>
    <link:label id="lab_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember_label_en-US" xlink:label="lab_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:to="lab_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesOther_019c49b4-9552-7eba-b2ff-d6550602eae1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesOther" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other - Temporary Differences</link:label>
    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesOther_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesOther" xlink:to="lab_us-gaap_DeferredTaxLiabilitiesOther" xlink:type="arc" order="1"/>
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    <link:label id="lab_fr_FourHundredCrossroadsPkwyMember_documentation_en-US" xlink:label="lab_fr_FourHundredCrossroadsPkwyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four hundred Crossroads Pkwy.</link:label>
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    <link:label id="lab_fr_SixFiveFourFourWarrenDriveMember_documentation_en-US" xlink:label="lab_fr_SixFiveFourFourWarrenDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six five four four warren drive.</link:label>
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    <link:label id="lab_us-gaap_StatementTable_114165b3-f74e-46f9-8289-2a80092f2cfa_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
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    <link:label id="lab_fr_EightFiveZeroFiveFiftyThStreetMember_label_en-US" xlink:label="lab_fr_EightFiveZeroFiveFiftyThStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eight Five Zero Five Fifty Th Street [Member]</link:label>
    <link:label id="lab_fr_EightFiveZeroFiveFiftyThStreetMember_documentation_en-US" xlink:label="lab_fr_EightFiveZeroFiveFiftyThStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eight Five Zero Five Fifty Th Street [Member]</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_370744c7-3194-4934-88ac-7b94e5459231_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]</link:label>
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    <link:label id="lab_fr_RealEstateHeldForSaleAccumulatedDepreciationAndAmortization_label_en-US" xlink:label="lab_fr_RealEstateHeldForSaleAccumulatedDepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real EstateHeld For Sale Accumulated Depreciation And Amortization</link:label>
    <link:label id="lab_fr_RealEstateHeldForSaleAccumulatedDepreciationAndAmortization_documentation_en-US" xlink:label="lab_fr_RealEstateHeldForSaleAccumulatedDepreciationAndAmortization" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Real EstateHeld For Sale Accumulated Depreciation And Amortization</link:label>
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    <link:label id="lab_fr_TwoNineEightFirstAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoNineEightFirstAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Nine Eight First Avenue [Member]</link:label>
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    <link:label id="lab_fr_OneOneFiveSevenValleyParkDriveMember_documentation_en-US" xlink:label="lab_fr_OneOneFiveSevenValleyParkDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One one five seven Valley Park Drive.</link:label>
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    <link:label id="lab_fr_IncomeProducingLandAcquisitionActivityMember_2ae4886a-3b40-4aee-8b87-6f2330b76b4a_terseLabel_en-US" xlink:label="lab_fr_IncomeProducingLandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Producing Land Acquisition Activity</link:label>
    <link:label id="lab_fr_IncomeProducingLandAcquisitionActivityMember_label_en-US" xlink:label="lab_fr_IncomeProducingLandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Producing Land Acquisition Activity [Member]</link:label>
    <link:label id="lab_fr_IncomeProducingLandAcquisitionActivityMember_documentation_en-US" xlink:label="lab_fr_IncomeProducingLandAcquisitionActivityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income Producing Land Acquisition Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncomeProducingLandAcquisitionActivityMember" xlink:href="fr-20251231.xsd#fr_IncomeProducingLandAcquisitionActivityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_IncomeProducingLandAcquisitionActivityMember" xlink:to="lab_fr_IncomeProducingLandAcquisitionActivityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember_2d5e06ea-6eb7-463d-a17d-9d4c5f63792a_terseLabel_en-US" xlink:label="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">16875 Heacock Street [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember_label_en-US" xlink:label="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sixteen Thousand Eight Hundred Seventy Five Heacock Street [Member]</link:label>
    <link:label id="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember_documentation_en-US" xlink:label="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sixteen Thousand Eight Hundred Seventy Five Heacock Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:href="fr-20251231.xsd#fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:to="lab_fr_SixteenThousandEightHundredSeventyFiveHeacockStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroEightFiveBurroughsAvenueMember_80d34984-2bbe-4179-bb95-29b05dbbf9b7_terseLabel_en-US" xlink:label="lab_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2085 Burroughs Avenue</link:label>
    <link:label id="lab_fr_TwoZeroEightFiveBurroughsAvenueMember_label_en-US" xlink:label="lab_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Eight Five Burroughs Avenue [Member]</link:label>
    <link:label id="lab_fr_TwoZeroEightFiveBurroughsAvenueMember_documentation_en-US" xlink:label="lab_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Eight Five Burroughs Avenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:href="fr-20251231.xsd#fr_TwoZeroEightFiveBurroughsAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:to="lab_fr_TwoZeroEightFiveBurroughsAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_TrdArrTerminationDate_terseLabel_en-US" xlink:label="lab_ecd_TrdArrTerminationDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Termination Date</link:label>
    <link:label id="lab_ecd_TrdArrTerminationDate_label_en-US" xlink:label="lab_ecd_TrdArrTerminationDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Arrangement Termination Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrTerminationDate" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_TrdArrTerminationDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_TrdArrTerminationDate" xlink:to="lab_ecd_TrdArrTerminationDate" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_StraightLineRentAdjustmentNet_f798f8db-7500-4473-bcd4-48d4e9e18ec1_negatedTerseLabel_en-US" xlink:label="lab_fr_StraightLineRentAdjustmentNet" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Straight-line Rental Income and Expense, Net</link:label>
    <link:label id="lab_fr_StraightLineRentAdjustmentNet_label_en-US" xlink:label="lab_fr_StraightLineRentAdjustmentNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Straight Line Rent Adjustment Net</link:label>
    <link:label id="lab_fr_StraightLineRentAdjustmentNet_documentation_en-US" xlink:label="lab_fr_StraightLineRentAdjustmentNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Straight Line Rent Adjustment Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_StraightLineRentAdjustmentNet" xlink:href="fr-20251231.xsd#fr_StraightLineRentAdjustmentNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_StraightLineRentAdjustmentNet" xlink:to="lab_fr_StraightLineRentAdjustmentNet" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_InsiderTrdPoliciesProcAdoptedFlag_terseLabel_en-US" xlink:label="lab_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insider Trading Policies and Procedures Adopted</link:label>
    <link:label id="lab_ecd_InsiderTrdPoliciesProcAdoptedFlag_label_en-US" xlink:label="lab_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insider Trading Policies and Procedures Adopted [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTrdPoliciesProcAdoptedFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:to="lab_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember_76ef3cdc-757e-4990-ac98-03a59ba30423_terseLabel_en-US" xlink:label="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">17100 Perris Boulevard [Member]</link:label>
    <link:label id="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember_label_en-US" xlink:label="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seventeen Thousand One Hundred Perris Boulevard [Member]</link:label>
    <link:label id="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember_documentation_en-US" xlink:label="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seventeen Thousand One Hundred Perris Boulevard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:href="fr-20251231.xsd#fr_SeventeenThousandOneHundredPerrisBoulevardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:to="lab_fr_SeventeenThousandOneHundredPerrisBoulevardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember_66455da7-8d37-463e-a192-a2af9c7f389d_terseLabel_en-US" xlink:label="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10680 88th Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember_label_en-US" xlink:label="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Zero Six Eight Zero Eighty Eighth Avenue [Member]</link:label>
    <link:label id="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember_documentation_en-US" xlink:label="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Zero Six Eight Zero [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:href="fr-20251231.xsd#fr_OneZeroSixEightZeroEightyEighthAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:to="lab_fr_OneZeroSixEightZeroEightyEighthAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a9856700-e6bf-45b6-9407-1504de646dbb_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Shares/Units Outstanding - Basic</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_0527cdd4-f5ad-4953-90f1-540572b1fbb7_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Shares/Units - Basic</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourFiveWLodgeMember_073b8fd7-f1c0-4829-adcc-2a8b6b2f1aa1_terseLabel_en-US" xlink:label="lab_fr_TwoFourFiveWLodgeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">245 W. Lodge [Member]</link:label>
    <link:label id="lab_fr_TwoFourFiveWLodgeMember_label_en-US" xlink:label="lab_fr_TwoFourFiveWLodgeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Five W Lodge [Member]</link:label>
    <link:label id="lab_fr_TwoFourFiveWLodgeMember_documentation_en-US" xlink:label="lab_fr_TwoFourFiveWLodgeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two four five w lodge.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourFiveWLodgeMember" xlink:href="fr-20251231.xsd#fr_TwoFourFiveWLodgeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourFiveWLodgeMember" xlink:to="lab_fr_TwoFourFiveWLodgeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_019c484b-b93f-7412-b2c6-da1e5b8921a5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Description of Variable Rate Basis</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Description of Variable Rate Basis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:to="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_d113dd91-116e-493b-9589-575ff37b6b75_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Computation of Basic and Diluted Earnings Per Share / Unit</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_DirectorMember_59b75825-fdd5-474b-ab6d-3ee9ad2a0f56_terseLabel_en-US" xlink:label="lab_srt_DirectorMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Director</link:label>
    <link:label id="lab_srt_DirectorMember_label_en-US" xlink:label="lab_srt_DirectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Director [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_DirectorMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_DirectorMember" xlink:to="lab_srt_DirectorMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TaxJurisdictionOtherStatesMember_019c45eb-1566-7741-9f94-38800a45c9c1_terseLabel_en-US" xlink:label="lab_fr_TaxJurisdictionOtherStatesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other States</link:label>
    <link:label id="lab_fr_TaxJurisdictionOtherStatesMember_label_en-US" xlink:label="lab_fr_TaxJurisdictionOtherStatesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Jurisdiction, Other States [Member]</link:label>
    <link:label id="lab_fr_TaxJurisdictionOtherStatesMember_documentation_en-US" xlink:label="lab_fr_TaxJurisdictionOtherStatesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tax Jurisdiction, Other States (Income Taxes Paid)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TaxJurisdictionOtherStatesMember" xlink:href="fr-20251231.xsd#fr_TaxJurisdictionOtherStatesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TaxJurisdictionOtherStatesMember" xlink:to="lab_fr_TaxJurisdictionOtherStatesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventsAbstract_c1664c29-96a4-423f-a754-b8ef056160f4_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events [Abstract]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventsAbstract_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsAbstract" xlink:to="lab_us-gaap_SubsequentEventsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtDisclosureAbstract_5458fc43-c7d2-4a75-aa82-438ab760d2db_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:label id="lab_us-gaap_DebtDisclosureAbstract_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract" xlink:to="lab_us-gaap_DebtDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_4c93db03-dc1e-4844-895a-6671283fcd11_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Income (Expense):</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense) [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="lab_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_IncentiveFeesAfterElimination_019c4585-7a3b-7705-99a8-2cea30d90576_terseLabel_en-US" xlink:label="lab_fr_IncentiveFeesAfterElimination" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incentive Fees after Elimination</link:label>
    <link:label id="lab_fr_IncentiveFeesAfterElimination_label_en-US" xlink:label="lab_fr_IncentiveFeesAfterElimination" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incentive Fees after Elimination</link:label>
    <link:label id="lab_fr_IncentiveFeesAfterElimination_documentation_en-US" xlink:label="lab_fr_IncentiveFeesAfterElimination" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incentive Fees after Elimination</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_IncentiveFeesAfterElimination" xlink:href="fr-20251231.xsd#fr_IncentiveFeesAfterElimination"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_IncentiveFeesAfterElimination" xlink:to="lab_fr_IncentiveFeesAfterElimination" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_d19a5104-5401-42ec-94f7-5045eb237efc_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unamortized Discounts</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unamortized Discount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscount" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscount" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveNineSevenSevenNorthBroadwayMember_da716d1f-14ff-4984-b55e-9125add46f31_terseLabel_en-US" xlink:label="lab_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5977 North Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveNineSevenSevenNorthBroadwayMember_label_en-US" xlink:label="lab_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Nine Seven Seven North Broadway [Member]</link:label>
    <link:label id="lab_fr_FiveNineSevenSevenNorthBroadwayMember_documentation_en-US" xlink:label="lab_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Nine Seven Seven North Broadway [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:href="fr-20251231.xsd#fr_FiveNineSevenSevenNorthBroadwayMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:to="lab_fr_FiveNineSevenSevenNorthBroadwayMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt_terseLabel_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Expense of Enforcement, Amount</link:label>
    <link:label id="lab_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt_label_en-US" xlink:label="lab_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forgone Recovery due to Expense of Enforcement, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:to="lab_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroTwoFiveMidwayRoadMember_2c650c46-3b30-4a01-83a2-9e384ad8bfd3_terseLabel_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2025 Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoFiveMidwayRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Two Five Midway Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroTwoFiveMidwayRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Zero Two Five Midway Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroTwoFiveMidwayRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:to="lab_fr_TwoZeroTwoFiveMidwayRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8b1d1558-445e-4acf-b306-f13ede6208d7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_3ec09124-c915-4e73-9901-fcc78831c852_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common Stock, par value</link:label>
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Par or Stated Value Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TenThousandSevenHundredNineGilroyRoadMember_799d4249-b6ec-48bb-ad06-62b9829d57a6_terseLabel_en-US" xlink:label="lab_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">10709 Gilroy Road [Member]</link:label>
    <link:label id="lab_fr_TenThousandSevenHundredNineGilroyRoadMember_label_en-US" xlink:label="lab_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ten Thousand Seven Hundred Nine Gilroy Road [Member]</link:label>
    <link:label id="lab_fr_TenThousandSevenHundredNineGilroyRoadMember_documentation_en-US" xlink:label="lab_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ten thousand seven hundred nine Gilroy Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:href="fr-20251231.xsd#fr_TenThousandSevenHundredNineGilroyRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:to="lab_fr_TenThousandSevenHundredNineGilroyRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneSevenFourZeroRiverHillsDriveMember_cfbd2e5e-b87b-4fa1-83e6-7e864b0643b6_terseLabel_en-US" xlink:label="lab_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1740 River Hills Drive [Member]</link:label>
    <link:label id="lab_fr_OneSevenFourZeroRiverHillsDriveMember_label_en-US" xlink:label="lab_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Seven Four Zero River Hills Drive [Member]</link:label>
    <link:label id="lab_fr_OneSevenFourZeroRiverHillsDriveMember_documentation_en-US" xlink:label="lab_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One seven four zero River Hills Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:href="fr-20251231.xsd#fr_OneSevenFourZeroRiverHillsDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:to="lab_fr_OneSevenFourZeroRiverHillsDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ImpairmentOfRealEstate_84be0c72-2691-4d49-83a5-59ba8ca9c676_negatedLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfRealEstate" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Impairment of Real Estate</link:label>
    <link:label id="lab_us-gaap_ImpairmentOfRealEstate_label_en-US" xlink:label="lab_us-gaap_ImpairmentOfRealEstate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment of Real Estate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfRealEstate" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfRealEstate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairmentOfRealEstate" xlink:to="lab_us-gaap_ImpairmentOfRealEstate" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoZeroHookMountainRoadMember_603fb643-dcc2-4685-81c8-d9750717dd79_terseLabel_en-US" xlink:label="lab_fr_TwoZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">20 Hook Mountain Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroHookMountainRoadMember_label_en-US" xlink:label="lab_fr_TwoZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Zero Hook Mountain Road [Member]</link:label>
    <link:label id="lab_fr_TwoZeroHookMountainRoadMember_documentation_en-US" xlink:label="lab_fr_TwoZeroHookMountainRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two zero Hook Mountain Road.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoZeroHookMountainRoadMember" xlink:href="fr-20251231.xsd#fr_TwoZeroHookMountainRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoZeroHookMountainRoadMember" xlink:to="lab_fr_TwoZeroHookMountainRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PaymentsToSettleDerivativeInstruments_019c49cc-a4ea-702a-81fc-b2c6f6524fe5_negatedTerseLabel_en-US" xlink:label="lab_fr_PaymentsToSettleDerivativeInstruments" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments to Settle Derivative Instruments</link:label>
    <link:label id="lab_fr_PaymentsToSettleDerivativeInstruments_019c43c5-1ffb-7ddc-930e-76f1da211d1d_terseLabel_en-US" xlink:label="lab_fr_PaymentsToSettleDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments to Settle Derivative Instruments</link:label>
    <link:label id="lab_fr_PaymentsToSettleDerivativeInstruments_label_en-US" xlink:label="lab_fr_PaymentsToSettleDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Settle Derivative Instruments</link:label>
    <link:label id="lab_fr_PaymentsToSettleDerivativeInstruments_documentation_en-US" xlink:label="lab_fr_PaymentsToSettleDerivativeInstruments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments to Settle Derivative Instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PaymentsToSettleDerivativeInstruments" xlink:href="fr-20251231.xsd#fr_PaymentsToSettleDerivativeInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PaymentsToSettleDerivativeInstruments" xlink:to="lab_fr_PaymentsToSettleDerivativeInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeThousandFourHundredFraserStreetMember_daceae49-59f6-4e74-b812-2f0d69f0f9f0_terseLabel_en-US" xlink:label="lab_fr_ThreeThousandFourHundredFraserStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3400 Fraser Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThousandFourHundredFraserStreetMember_label_en-US" xlink:label="lab_fr_ThreeThousandFourHundredFraserStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Thousand Four Hundred Fraser Street [Member]</link:label>
    <link:label id="lab_fr_ThreeThousandFourHundredFraserStreetMember_documentation_en-US" xlink:label="lab_fr_ThreeThousandFourHundredFraserStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three thousand four hundred Fraser Street.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeThousandFourHundredFraserStreetMember" xlink:href="fr-20251231.xsd#fr_ThreeThousandFourHundredFraserStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeThousandFourHundredFraserStreetMember" xlink:to="lab_fr_ThreeThousandFourHundredFraserStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UseOfEstimates_0a1f1fa0-7d31-4f43-b659-d5f09feac6f5_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Use of Estimates</link:label>
    <link:label id="lab_us-gaap_UseOfEstimates_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UseOfEstimates" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UseOfEstimates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UseOfEstimates" xlink:to="lab_us-gaap_UseOfEstimates" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember_ebc19671-226a-4357-ae3b-8e5a008ee80a_terseLabel_en-US" xlink:label="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3801-3851 Yale St [Member]</link:label>
    <link:label id="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember_label_en-US" xlink:label="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Eight Zero One To Three Eight Five One Yale St [Member]</link:label>
    <link:label id="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember_documentation_en-US" xlink:label="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Eight Zero One To Three Eight Five One Yale St [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:href="fr-20251231.xsd#fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:to="lab_fr_ThreeEightZeroOneToThreeEightFiveOneYaleStMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoThousandSevenHundredCommerceDriveMember_0822fbff-fa00-4d1e-87a5-ddf62e1deb1d_terseLabel_en-US" xlink:label="lab_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2700 Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredCommerceDriveMember_label_en-US" xlink:label="lab_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Seven Hundred Commerce Drive [Member]</link:label>
    <link:label id="lab_fr_TwoThousandSevenHundredCommerceDriveMember_documentation_en-US" xlink:label="lab_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand seven hundred commerce drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:href="fr-20251231.xsd#fr_TwoThousandSevenHundredCommerceDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:to="lab_fr_TwoThousandSevenHundredCommerceDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_a4dd223d-5710-41e3-baa2-afc00f426c54_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsTextBlock" xlink:to="lab_us-gaap_SubsequentEventsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_InsiderTradingArrLineItems_label_en-US" xlink:label="lab_ecd_InsiderTradingArrLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insider Trading Arrangements [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTradingArrLineItems" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTradingArrLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="lab_ecd_InsiderTradingArrLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember_eda9d852-2523-4685-80b1-18f39c886b93_terseLabel_en-US" xlink:label="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5775 12th Avenue [Member]</link:label>
    <link:label id="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember_label_en-US" xlink:label="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Seven Seven Five One Two Th Avenue [Member]</link:label>
    <link:label id="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember_documentation_en-US" xlink:label="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five seven seven five one two Th Avenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:href="fr-20251231.xsd#fr_FiveSevenSevenFiveOneTwoThAvenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:to="lab_fr_FiveSevenSevenFiveOneTwoThAvenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeEightZeroZeroSenlacDriveMember_5dfa97c8-9d68-4695-8e8d-b8c07b2417c8_terseLabel_en-US" xlink:label="lab_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">13800 Senlac Drive [Member]</link:label>
    <link:label id="lab_fr_OneThreeEightZeroZeroSenlacDriveMember_label_en-US" xlink:label="lab_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Eight Zero Zero Senlac Drive [Member]</link:label>
    <link:label id="lab_fr_OneThreeEightZeroZeroSenlacDriveMember_documentation_en-US" xlink:label="lab_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Eight Zero Zero Senlac Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:href="fr-20251231.xsd#fr_OneThreeEightZeroZeroSenlacDriveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:to="lab_fr_OneThreeEightZeroZeroSenlacDriveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Liabilities_fcec4154-af67-4922-9c1b-16da91f20c5c_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Liabilities</link:label>
    <link:label id="lab_us-gaap_Liabilities_label_en-US" xlink:label="lab_us-gaap_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities" xlink:to="lab_us-gaap_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_RealEstateExcludingHeldforSale_aa5a40d4-b55c-42d0-af26-779a3cf2c47a_terseLabel_en-US" xlink:label="lab_fr_RealEstateExcludingHeldforSale" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance, End of Year Excluding Real Estate Held for Sale</link:label>
    <link:label id="lab_fr_RealEstateExcludingHeldforSale_label_en-US" xlink:label="lab_fr_RealEstateExcludingHeldforSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">RealEstateExcludingHeld-for-Sale</link:label>
    <link:label id="lab_fr_RealEstateExcludingHeldforSale_documentation_en-US" xlink:label="lab_fr_RealEstateExcludingHeldforSale" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Real Estate Excluding Held-for-Sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_RealEstateExcludingHeldforSale" xlink:href="fr-20251231.xsd#fr_RealEstateExcludingHeldforSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_RealEstateExcludingHeldforSale" xlink:to="lab_fr_RealEstateExcludingHeldforSale" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_SevenSixSixSixFormulaPlaceMember_e7b36f52-0da9-49f8-8edc-c0a72aaf9d9a_terseLabel_en-US" xlink:label="lab_fr_SevenSixSixSixFormulaPlaceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7666 Formula Place</link:label>
    <link:label id="lab_fr_SevenSixSixSixFormulaPlaceMember_label_en-US" xlink:label="lab_fr_SevenSixSixSixFormulaPlaceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Six Six Six Formula Place [Member]</link:label>
    <link:label id="lab_fr_SevenSixSixSixFormulaPlaceMember_documentation_en-US" xlink:label="lab_fr_SevenSixSixSixFormulaPlaceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Six Six Six Formula Place</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_SevenSixSixSixFormulaPlaceMember" xlink:href="fr-20251231.xsd#fr_SevenSixSixSixFormulaPlaceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_SevenSixSixSixFormulaPlaceMember" xlink:to="lab_fr_SevenSixSixSixFormulaPlaceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_e6f1486c-1bd5-427d-8a46-a18d0bc72970_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Commitment Fee Percentage</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Commitment Fee Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:to="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_PnsnAdjsPrrSvcCstMember_terseLabel_en-US" xlink:label="lab_ecd_PnsnAdjsPrrSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension Adjustments Prior Service Cost</link:label>
    <link:label id="lab_ecd_PnsnAdjsPrrSvcCstMember_label_en-US" xlink:label="lab_ecd_PnsnAdjsPrrSvcCstMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension Adjustments Prior Service Cost [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnAdjsPrrSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_PnsnAdjsPrrSvcCstMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_PnsnAdjsPrrSvcCstMember" xlink:to="lab_ecd_PnsnAdjsPrrSvcCstMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_PurchasePrice_a8d7934b-1269-4d29-9aba-64a688d2beac_terseLabel_en-US" xlink:label="lab_fr_PurchasePrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Purchase Price of Industrial Properties and Land Parcels Acquired</link:label>
    <link:label id="lab_fr_PurchasePrice_label_en-US" xlink:label="lab_fr_PurchasePrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price</link:label>
    <link:label id="lab_fr_PurchasePrice_documentation_en-US" xlink:label="lab_fr_PurchasePrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of assets acquired.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_PurchasePrice" xlink:href="fr-20251231.xsd#fr_PurchasePrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_PurchasePrice" xlink:to="lab_fr_PurchasePrice" xlink:type="arc" order="1"/>
    <link:label id="lab_ecd_MtrlTermsOfTrdArrTextBlock_terseLabel_en-US" xlink:label="lab_ecd_MtrlTermsOfTrdArrTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Material Terms of Trading Arrangement</link:label>
    <link:label id="lab_ecd_MtrlTermsOfTrdArrTextBlock_label_en-US" xlink:label="lab_ecd_MtrlTermsOfTrdArrTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Material Terms of Trading Arrangement [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MtrlTermsOfTrdArrTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_MtrlTermsOfTrdArrTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ecd_MtrlTermsOfTrdArrTextBlock" xlink:to="lab_ecd_MtrlTermsOfTrdArrTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock_01900978-4e87-496a-b28c-dd76ac36b280_terseLabel_en-US" xlink:label="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Federal Income Tax Treatment of Common Dividends</link:label>
    <link:label id="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock_label_en-US" xlink:label="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Federal Income Tax Treatment of Common Dividends [Table Text Block]</link:label>
    <link:label id="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock_documentation_en-US" xlink:label="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">For income tax purposes, distributions paid to common shareholders are classified as ordinary income, capital gain, return of capital or qualified dividends.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:href="fr-20251231.xsd#fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:to="lab_fr_FederalIncomeTaxTreatmentofCommonDividendsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsToAcquireInterestInJointVenture_13e6d54c-3224-448a-8163-03e1c734db8d_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInterestInJointVenture" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Contributions to and Investments in Joint Venture</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireInterestInJointVenture_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInterestInJointVenture" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Interest in Joint Venture</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInterestInJointVenture" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireInterestInJointVenture"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireInterestInJointVenture" xlink:to="lab_us-gaap_PaymentsToAcquireInterestInJointVenture" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements_29383eff-9a2b-4158-9037-afb651908c73_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs</link:label>
    <link:label id="lab_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements_label_en-US" xlink:label="lab_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Leasing Costs, Commissions, and Tenant Improvements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements" xlink:to="lab_us-gaap_PaymentsForLeasingCostsCommissionsAndTenantImprovements" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_OneThreeZeroMaddoxRoadMember_5a71e41e-c9cb-4a8f-9b91-1a18f26679f4_terseLabel_en-US" xlink:label="lab_fr_OneThreeZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">130 Maddox Road [Member]</link:label>
    <link:label id="lab_fr_OneThreeZeroMaddoxRoadMember_label_en-US" xlink:label="lab_fr_OneThreeZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Three Zero Maddox Road [Member]</link:label>
    <link:label id="lab_fr_OneThreeZeroMaddoxRoadMember_documentation_en-US" xlink:label="lab_fr_OneThreeZeroMaddoxRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Three Zero Maddox Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_OneThreeZeroMaddoxRoadMember" xlink:href="fr-20251231.xsd#fr_OneThreeZeroMaddoxRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_OneThreeZeroMaddoxRoadMember" xlink:to="lab_fr_OneThreeZeroMaddoxRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember_05d2c039-8b71-4593-be67-8f73f571879c_terseLabel_en-US" xlink:label="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2737 W Grand Parkway N [Member]</link:label>
    <link:label id="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember_label_en-US" xlink:label="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Seven Three Seven W Grand Parkway N [Member]</link:label>
    <link:label id="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember_documentation_en-US" xlink:label="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Seven Three Seven W Grand Parkway N [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:href="fr-20251231.xsd#fr_TwoSevenThreeSevenWGrandParkwayNMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:to="lab_fr_TwoSevenThreeSevenWGrandParkwayNMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues_58f0ff13-b8d3-470a-8e12-cbf8c7c7d9a9_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of Common Stock / Contribution of General Partner Units, Net of Issuance Costs</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, New Issues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_32ba1922-de6b-403c-b3f8-56a05591ed5f_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unamortized Debt Issuance Costs</link:label>
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_6107b15c-3f4d-4c02-a630-a28da5e043b4_terseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unamortized Debt Issuance Expense</link:label>
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_label_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unamortized Debt Issuance Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnamortizedDebtIssuanceExpense" xlink:to="lab_us-gaap_UnamortizedDebtIssuanceExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoTwoFiveZeroEastBardinRoadMember_2199169c-a722-4055-8b57-05dbaadf8b54_terseLabel_en-US" xlink:label="lab_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2250 East Bardin Road [Member]</link:label>
    <link:label id="lab_fr_TwoTwoFiveZeroEastBardinRoadMember_label_en-US" xlink:label="lab_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Two Five Zero East Bardin Road [Member]</link:label>
    <link:label id="lab_fr_TwoTwoFiveZeroEastBardinRoadMember_documentation_en-US" xlink:label="lab_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Two Five Zero East Bardin Road [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:href="fr-20251231.xsd#fr_TwoTwoFiveZeroEastBardinRoadMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:to="lab_fr_TwoTwoFiveZeroEastBardinRoadMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoFourZeroZeroMainStreetMember_084cb636-5615-4b9d-8bb6-fb2551112e7a_terseLabel_en-US" xlink:label="lab_fr_TwoFourZeroZeroMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2400 Main Street [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroZeroMainStreetMember_label_en-US" xlink:label="lab_fr_TwoFourZeroZeroMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Four Zero Zero Main Street [Member]</link:label>
    <link:label id="lab_fr_TwoFourZeroZeroMainStreetMember_documentation_en-US" xlink:label="lab_fr_TwoFourZeroZeroMainStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Four Zero Zero Main Street [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoFourZeroZeroMainStreetMember" xlink:href="fr-20251231.xsd#fr_TwoFourZeroZeroMainStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fr_TwoFourZeroZeroMainStreetMember" xlink:to="lab_fr_TwoFourZeroZeroMainStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_fr_TwoSixWorldsFairDriveMember_89e4f886-7284-4931-b245-0f9aadcc55c1_terseLabel_en-US" xlink:label="lab_fr_TwoSixWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">26 World's Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoSixWorldsFairDriveMember_label_en-US" xlink:label="lab_fr_TwoSixWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Six Worlds Fair Drive [Member]</link:label>
    <link:label id="lab_fr_TwoSixWorldsFairDriveMember_documentation_en-US" xlink:label="lab_fr_TwoSixWorldsFairDriveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two six World's Fair Drive.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_fr_TwoSixWorldsFairDriveMember" xlink:href="fr-20251231.xsd#fr_TwoSixWorldsFairDriveMember"/>
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    <link:label id="lab_fr_EightFourZeroZeroNWNinetiethStreetMember_c04cab2a-ea3d-4777-8c4a-240463695e0d_terseLabel_en-US" xlink:label="lab_fr_EightFourZeroZeroNWNinetiethStreetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8400 NW 90th Street</link:label>
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