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  <xs:element id="fr_IncomeProducingLandAcquisitionActivityMember" abstract="true" name="IncomeProducingLandAcquisitionActivityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_OneFourFourFiveEngineerStreetMember" abstract="true" name="OneFourFourFiveEngineerStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_EightZeroOneThroughEightOneSevenEAnaheimStreetMember" abstract="true" name="EightZeroOneThroughEightOneSevenEAnaheimStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_OneFourFiveOneEightSantaAnaAvenueMember" abstract="true" name="OneFourFiveOneEightSantaAnaAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fr_OneOneTwoFiveThreeRedwoodAvenueMember" abstract="true" name="OneOneTwoFiveThreeRedwoodAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fr_TwoFourSixSixFiveNandinaAvenueMember" abstract="true" name="TwoFourSixSixFiveNandinaAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_ThreeOneTwoFiveWilsonAvenueMember" abstract="true" name="ThreeOneTwoFiveWilsonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_EightFourOneZeroArjonsDriveMember" abstract="true" name="EightFourOneZeroArjonsDriveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_ThreeOneSevenFiveWilsonAvenueMember" abstract="true" name="ThreeOneSevenFiveWilsonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="fr_ScheduleIIIRealEstateHeldForSaleOtherAssets" abstract="false" name="ScheduleIIIRealEstateHeldForSaleOtherAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fr_ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" abstract="false" name="ScheduleIIIRealEstateHeldForSaleOtherAssetsAccumulatedDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fr_RealEstateandAccumulatedDepreciationAbstract" abstract="true" name="RealEstateandAccumulatedDepreciationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
