BRANDYWINE REALTY TRUST BRANDYWINE OPERATING PARTNERSHIP, L.P. BDN 0000790816 0001060386 2018-12-31 false false FY FY --12-31 --12-31 Yes Yes No No Yes Yes Large Accelerated Filer Non-accelerated Filer false false false false false false P5Y P55Y P1Y P16Y P1Y 1 0.15 0.70 1 1 2020-03-01 P2Y P57Y 2019-04-15 2020-04-15 2021-04-15 P10Y 38000000 1 0.70 0.15 1 1 P10Y P5Y P6M P1Y1M6D P1Y3M P1Y3M P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P30Y P40Y P29Y P29Y P25Y P24Y P30Y P38Y P29Y P29Y P25Y P25Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P34Y P36Y P40Y P40Y P30Y P26Y P40Y P5Y P40Y P12Y P40Y P50Y P40Y P55Y P52Y P45Y P45Y P45Y P52Y P51Y P35Y P35Y P35Y P35Y P35Y P40Y P35Y P35Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P40Y P30Y P23Y 0.0110 0.0125 2020-05-01 2021-02-28 2023-04-05 2023-04-05 2022-07-15 2022-10-08 2018-04-15 2023-02-15 2024-10-01 2029-10-01 2035-03-30 2035-04-30 2035-07-30 0000790816 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember 2018-01-01 2018-12-31 iso4217:USD 0000790816 2018-06-30 xbrli:shares 0000790816 2019-02-15 0000790816 2018-12-31 0000790816 2017-12-31 iso4217:USD xbrli:shares 0000790816 bdn:RentsMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember 2017-01-01 2017-12-31 0000790816 bdn:RentsMember 2016-01-01 2016-12-31 0000790816 bdn:TenantReimbursementsMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember 2017-01-01 2017-12-31 0000790816 bdn:TenantReimbursementsMember 2016-01-01 2016-12-31 0000790816 bdn:TerminationFeesMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember 2017-01-01 2017-12-31 0000790816 bdn:TerminationFeesMember 2016-01-01 2016-12-31 0000790816 bdn:ThirdPartyManagementRevenueMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementRevenueMember 2017-01-01 2017-12-31 0000790816 bdn:ThirdPartyManagementRevenueMember 2016-01-01 2016-12-31 0000790816 us-gaap:RealEstateOtherMember 2018-01-01 2018-12-31 0000790816 us-gaap:RealEstateOtherMember 2017-01-01 2017-12-31 0000790816 us-gaap:RealEstateOtherMember 2016-01-01 2016-12-31 0000790816 2017-01-01 2017-12-31 0000790816 2016-01-01 2016-12-31 0000790816 us-gaap:PreferredStockMember 2015-12-31 0000790816 us-gaap:CommonStockMember 2015-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2015-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2015-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2015-12-31 0000790816 us-gaap:RetainedEarningsMember 2015-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2015-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2015-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2015-12-31 0000790816 2015-12-31 0000790816 us-gaap:RetainedEarningsMember 2016-01-01 2016-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2016-01-01 2016-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-01-01 2016-12-31 0000790816 us-gaap:CommonStockMember 2016-01-01 2016-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2016-01-01 2016-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2016-01-01 2016-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2016-01-01 2016-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2016-01-01 2016-12-31 0000790816 us-gaap:PreferredStockMember 2016-12-31 0000790816 us-gaap:CommonStockMember 2016-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2016-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2016-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2016-12-31 0000790816 us-gaap:RetainedEarningsMember 2016-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2016-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2016-12-31 0000790816 2016-12-31 0000790816 us-gaap:RetainedEarningsMember 2017-01-01 2017-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2017-01-01 2017-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-01-01 2017-12-31 0000790816 us-gaap:CommonStockMember 2017-01-01 2017-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2017-01-01 2017-12-31 0000790816 us-gaap:PreferredStockMember 2017-01-01 2017-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2017-01-01 2017-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2017-01-01 2017-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2017-01-01 2017-12-31 0000790816 us-gaap:PreferredStockMember 2017-12-31 0000790816 us-gaap:CommonStockMember 2017-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2017-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2017-12-31 0000790816 us-gaap:RetainedEarningsMember 2017-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2017-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2017-12-31 0000790816 us-gaap:RetainedEarningsMember 2018-01-01 2018-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2018-01-01 2018-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-12-31 0000790816 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2018-01-01 2018-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2018-01-01 2018-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2018-01-01 2018-12-31 0000790816 us-gaap:PreferredStockMember 2018-12-31 0000790816 us-gaap:CommonStockMember 2018-12-31 0000790816 us-gaap:DeferredCompensationShareBasedPaymentsMember 2018-12-31 0000790816 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000790816 bdn:CommonStockHeldInTrustMember 2018-12-31 0000790816 us-gaap:RetainedEarningsMember 2018-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000790816 us-gaap:AccumulatedDistributionsInExcessOfNetIncomeMember 2018-12-31 0000790816 us-gaap:NoncontrollingInterestMember 2018-12-31 0000790816 srt:SubsidiariesMember 2018-12-31 0000790816 srt:SubsidiariesMember 2017-12-31 0000790816 srt:SubsidiariesMember bdn:RentsMember 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember bdn:RentsMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember bdn:RentsMember 2016-01-01 2016-12-31 0000790816 srt:SubsidiariesMember bdn:TenantReimbursementsMember 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember bdn:TenantReimbursementsMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember bdn:TenantReimbursementsMember 2016-01-01 2016-12-31 0000790816 srt:SubsidiariesMember bdn:TerminationFeesMember 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember bdn:TerminationFeesMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember bdn:TerminationFeesMember 2016-01-01 2016-12-31 0000790816 srt:SubsidiariesMember bdn:ThirdPartyManagementRevenueMember 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember bdn:ThirdPartyManagementRevenueMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember bdn:ThirdPartyManagementRevenueMember 2016-01-01 2016-12-31 0000790816 srt:SubsidiariesMember us-gaap:RealEstateOtherMember 2018-01-01 2018-12-31 0000790816 srt:SubsidiariesMember us-gaap:RealEstateOtherMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember us-gaap:RealEstateOtherMember 2016-01-01 2016-12-31 0000790816 srt:SubsidiariesMember 2017-01-01 2017-12-31 0000790816 srt:SubsidiariesMember 2016-01-01 2016-12-31 0000790816 bdn:SeriesELinkedPreferredStockMember srt:SubsidiariesMember 2015-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2015-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2015-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2015-12-31 0000790816 srt:SubsidiariesMember 2015-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2016-01-01 2016-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2016-01-01 2016-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2016-01-01 2016-12-31 0000790816 bdn:SeriesELinkedPreferredStockMember srt:SubsidiariesMember 2016-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2016-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2016-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2016-12-31 0000790816 srt:SubsidiariesMember 2016-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2017-01-01 2017-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2017-01-01 2017-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2017-01-01 2017-12-31 0000790816 bdn:SeriesELinkedPreferredStockMember srt:SubsidiariesMember 2017-01-01 2017-12-31 0000790816 bdn:SeriesELinkedPreferredStockMember srt:SubsidiariesMember 2017-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2017-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2017-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2017-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2018-01-01 2018-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2018-01-01 2018-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2018-01-01 2018-12-31 0000790816 bdn:SeriesELinkedPreferredStockMember srt:SubsidiariesMember 2018-12-31 0000790816 us-gaap:GeneralPartnerMember srt:SubsidiariesMember 2018-12-31 0000790816 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:SubsidiariesMember 2018-12-31 0000790816 us-gaap:NoncontrollingInterestMember srt:SubsidiariesMember 2018-12-31 0000790816 bdn:LandSaleMember 2018-01-01 2018-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2018-01-01 2018-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember 2018-01-01 2018-12-31 0000790816 bdn:AustinJointVentureMember 2018-01-01 2018-12-31 xbrli:pure 0000790816 bdn:BrandywineOperatingPartnershipLPMember 2018-12-31 bdn:property 0000790816 bdn:DevelopmentPropertyMember 2018-12-31 0000790816 bdn:RedevelopmentPropertyMember 2018-12-31 utr:sqft 0000790816 srt:OfficeBuildingMember 2018-12-31 0000790816 bdn:MixedUsePropertiesMember 2018-12-31 0000790816 srt:RetailSiteMember 2018-12-31 0000790816 bdn:CorePropertiesMember 2018-12-31 0000790816 bdn:DevelopmentProjectsMember 2018-12-31 0000790816 bdn:RedevelopmentProjectsMember 2018-12-31 utr:acre 0000790816 srt:ParentCompanyMember 2018-12-31 bdn:Parcel 0000790816 srt:ParentCompanyMember bdn:LeasholdInterestLandMember 2018-12-31 0000790816 srt:ParentCompanyMember bdn:LandParcelOneMember 2018-01-01 2018-12-31 0000790816 srt:ParentCompanyMember bdn:LandParcelTwoMember 2018-01-01 2018-12-31 0000790816 srt:ParentCompanyMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BrandywineRealtyServicesCorporationMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BDNManagementHoldingsLLCMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BrandywinePropertiesILimitedIncMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BDNBrokerageLLCMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BrandywinePropertiesManagementLPMember 2018-12-31 0000790816 srt:SubsidiariesMember bdn:BrandywineOperatingPartnershipLPMember bdn:BrandywineBrokerageServicesLLCMember 2018-12-31 0000790816 bdn:ManagementCompanySubsidiariesMember 2018-12-31 0000790816 bdn:ManagementCompanySubsidiariesMember us-gaap:WhollyOwnedPropertiesMember 2018-12-31 0000790816 bdn:ManagementCompanySubsidiariesMember us-gaap:PartiallyOwnedPropertiesMember 2018-12-31 0000790816 us-gaap:GeneralAndAdministrativeExpenseMember 2017-01-01 2017-12-31 0000790816 bdn:IncomeTaxExpenseBenefitMember 2017-01-01 2017-12-31 0000790816 bdn:ImpairmentChargesMember 2016-10-01 2016-12-31 0000790816 us-gaap:AccountingStandardsUpdate201618Member 2018-12-31 0000790816 us-gaap:AccountingStandardsUpdate201618Member 2017-12-31 0000790816 us-gaap:AccountingStandardsUpdate201618Member 2016-12-31 0000790816 us-gaap:AccountingStandardsUpdate201618Member 2017-01-01 2017-12-31 0000790816 us-gaap:AccountingStandardsUpdate201618Member 2016-01-01 2016-12-31 0000790816 srt:MinimumMember 2018-01-01 2018-12-31 0000790816 srt:MaximumMember 2018-01-01 2018-12-31 0000790816 bdn:ConstructionInProgressDevelopmentMember 2018-01-01 2018-12-31 0000790816 bdn:ConstructionInProgressDevelopmentMember 2017-01-01 2017-12-31 0000790816 bdn:ConstructionInProgressDevelopmentMember 2016-01-01 2016-12-31 0000790816 bdn:ConstructionInProgressRedevelopmentMember 2018-01-01 2018-12-31 0000790816 bdn:ConstructionInProgressRedevelopmentMember 2017-01-01 2017-12-31 0000790816 bdn:ConstructionInProgressRedevelopmentMember 2016-01-01 2016-12-31 0000790816 bdn:ConstructionInProgressTenantImprovementsMember 2018-01-01 2018-12-31 0000790816 bdn:ConstructionInProgressTenantImprovementsMember 2017-01-01 2017-12-31 0000790816 bdn:ConstructionInProgressTenantImprovementsMember 2016-01-01 2016-12-31 bdn:Customer 0000790816 us-gaap:AccountsReceivableMember us-gaap:CustomerConcentrationRiskMember 2018-12-31 0000790816 us-gaap:AccountsReceivableMember us-gaap:CustomerConcentrationRiskMember 2017-12-31 0000790816 bdn:TenantReceivableMember 2018-12-31 0000790816 bdn:TenantReceivableMember 2017-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember 2017-01-01 2017-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember 2016-01-01 2016-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2018-06-26 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2018-06-25 2018-06-26 0000790816 bdn:BaseRentMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:BaseRentMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:StraightLineRentMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:PointOfSaleMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:RentsMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:TenantReimbursementsMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:TerminationFeesMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyManagementFeesLaborReimbursementAndLeasingMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember 2018-01-01 2018-12-31 0000790816 bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0000790816 us-gaap:CustomerConcentrationRiskMember bdn:RentRevenueMember 2018-12-31 0000790816 us-gaap:CustomerConcentrationRiskMember bdn:RentRevenueMember 2017-12-31 0000790816 us-gaap:CustomerConcentrationRiskMember bdn:RentRevenueMember 2016-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:GarzaLandSaleMember 2016-07-01 0000790816 bdn:GarzaLandAcquisitionMember bdn:GarzaLandSaleMember 2016-06-29 2016-07-01 0000790816 bdn:GarzaLandAcquisitionMember bdn:GarzaLandSaleMember 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:LandParcelOneMember bdn:GarzaLandSaleMember 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:LandParcelTwoMember bdn:GarzaLandSaleMember 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:LandParcelThreeMember bdn:GarzaLandSaleMember 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:ThirdPartyDevelopersMember bdn:LandParcelOneMember bdn:GarzaLandSaleMember 2018-01-01 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:ThirdPartyDevelopersMember bdn:LandParcelTwoMember bdn:GarzaLandSaleMember 2018-01-01 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember bdn:ThirdPartyMember bdn:LandParcelThreeMember bdn:GarzaLandSaleMember 2018-01-01 2018-12-31 0000790816 bdn:GarzaLandAcquisitionMember 2018-04-01 2018-06-30 0000790816 bdn:GarzaLandAcquisitionMember 2018-10-01 2018-12-31 0000790816 bdn:GarzaRanchOfficeMember us-gaap:LandMember 2018-03-16 0000790816 bdn:GarzaRanchMultiFamilyMember us-gaap:LandMember 2017-04-28 0000790816 bdn:GarzaRanchHotelMember us-gaap:LandMember 2017-01-30 0000790816 bdn:GarzaRanchMember us-gaap:LandMember 2018-12-31 0000790816 bdn:GarzaRanchOfficeMember us-gaap:LandMember 2018-03-15 2018-03-16 0000790816 bdn:GarzaRanchMultiFamilyMember us-gaap:LandMember 2017-04-27 2017-04-28 0000790816 bdn:GarzaRanchHotelMember us-gaap:LandMember 2017-01-29 2017-01-30 0000790816 bdn:GarzaRanchMember us-gaap:LandMember 2018-01-01 2018-12-31 0000790816 bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-03-15 0000790816 bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-03-14 2017-03-15 0000790816 bdn:SubaruBuildToServiceCenterProjectMember 2015-12-03 0000790816 bdn:SubaruBuildToServiceCenterProjectMember 2018-08-22 2018-08-23 0000790816 bdn:SubaruBuildToServiceCenterProjectMember 2018-01-01 2018-12-31 0000790816 bdn:SubaruBuildToServiceCenterProjectMember 2018-12-21 0000790816 bdn:SubaruBuildToServiceCenterProjectMember 2018-12-20 2018-12-21 0000790816 bdn:EmployeeStockOptionAndShareAppreciationRightsMember 2018-12-31 0000790816 2017-05-17 2017-05-18 0000790816 2017-05-18 0000790816 us-gaap:ScenarioPlanMember us-gaap:AccountingStandardsUpdate201602Member 2019-01-01 0000790816 us-gaap:BuildingAndBuildingImprovementsMember 2018-12-31 0000790816 us-gaap:BuildingAndBuildingImprovementsMember 2017-12-31 0000790816 bdn:QuarryLakeIIMember 2018-12-19 0000790816 bdn:QuarryLakeIIMember 2018-12-19 2018-12-19 0000790816 bdn:DRAAustinVentureMember 2018-12-11 0000790816 bdn:DRAAustinVentureMember 2018-12-11 2018-12-11 0000790816 bdn:DRAAustinVentureMember 2018-11-01 0000790816 bdn:ThreeThousandTwentyFiveJFKBoulevardMember 2018-06-28 2018-06-29 0000790816 bdn:ThreeThousandTwentyFiveJFKBoulevardMember 2018-06-29 0000790816 bdn:ThreeThousandTwentyFiveJFKBoulevardMember us-gaap:OtherAssetsMember 2018-06-29 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeAndThreeThousandTwentyFiveJFKBoulevardMember 2018-06-29 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeJFKBoulevardMember 2018-03-21 2018-03-22 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeJFKBoulevardMember 2018-03-22 0000790816 bdn:FourTowerBridgeMember 2018-01-05 0000790816 bdn:SevenTowerBridgeMember 2018-01-05 0000790816 bdn:FourTowerBridgeMember 2018-01-04 2018-01-05 0000790816 bdn:FourTowerBridgeMember bdn:ConshohockenMember stpr:PA 2018-01-05 0000790816 bdn:DRAAustinVentureMember bdn:IntangibleAssetsAcquiredMember 2018-12-11 2018-12-11 0000790816 bdn:FourTowerBridgeMember bdn:IntangibleAssetsAcquiredMember 2018-01-04 2018-01-05 0000790816 bdn:QuarryLakeIIMember bdn:BelowMarketLeaseMember 2018-12-19 2018-12-19 0000790816 bdn:DRAAustinVentureMember bdn:BelowMarketLeaseMember 2018-12-11 2018-12-11 0000790816 bdn:FourTowerBridgeMember bdn:BelowMarketLeaseMember 2018-01-04 2018-01-05 0000790816 bdn:FourTowerBridgeMember bdn:MortgageDebtAssumedAtFairValueMember 2018-01-05 0000790816 bdn:MortgageDebtAssumedAtFairValueMember 2018-12-11 2018-12-11 0000790816 bdn:MortgageDebtAssumedAtFairValueMember 2018-12-11 0000790816 bdn:QuarryLakeIIMember 2018-01-01 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2018-01-01 2018-12-31 0000790816 bdn:FourTowerBridgeMember 2018-01-01 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2017-01-01 2017-12-31 0000790816 bdn:MixedUsePropertiesMember bdn:SubaruNationalTrainingCenterMember 2018-01-01 2018-12-31 0000790816 srt:OfficeBuildingMember bdn:RockpointJointVentureMember 2018-01-01 2018-12-31 0000790816 srt:OfficeBuildingMember bdn:A20EastClementonRoadMember 2018-01-01 2018-12-31 0000790816 bdn:MixedUsePropertiesMember bdn:SubaruNationalTrainingCenterMember 2018-12-31 0000790816 srt:OfficeBuildingMember bdn:RockpointJointVentureMember 2018-12-31 0000790816 srt:OfficeBuildingMember bdn:A20EastClementonRoadMember 2018-12-31 0000790816 bdn:RockpointPortfolioMember bdn:MetropolitanDCOfficeMember 2018-12-20 0000790816 bdn:HerndonInnovationCenterMetroPortfolioVentureLLCMember bdn:MetropolitanDCOfficeMember 2018-12-20 0000790816 bdn:RockpointPortfolioMember bdn:MetropolitanDCOfficeMember 2018-07-01 2018-09-30 0000790816 bdn:RockpointPortfolioMember bdn:MetropolitanDCOfficeMember 2018-12-20 2018-12-20 0000790816 bdn:HerndonInnovationCenterMetroPortfolioVentureLLCMember bdn:MetropolitanDCOfficeMember 2018-12-20 2018-12-20 0000790816 us-gaap:LandMember bdn:WestparkLandMember 2018-01-10 0000790816 us-gaap:LandMember 2018-12-31 0000790816 us-gaap:LandMember bdn:WestparkLandMember 2018-01-09 2018-01-10 0000790816 us-gaap:LandMember 2018-01-01 2018-12-31 0000790816 bdn:GarzaRanchOfficeMember us-gaap:LandMember 2017-12-31 0000790816 bdn:GarzaRanchOfficeMember us-gaap:LandMember 2018-12-31 0000790816 bdn:GarzaRanchOfficeMember us-gaap:LandMember 2018-06-30 0000790816 us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember bdn:ImpairmentOnPropertiesHeldForUseMember 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputCapRateMember 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputDiscountRateMember 2018-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:PennsylvaniaSuburbsLandMember 2018-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentLandMember 2018-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2018-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2018-01-01 2018-09-30 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2018-09-30 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember bdn:OfficePropertiesMember 2018-09-30 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember us-gaap:MeasurementInputCapRateMember 2018-09-30 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember us-gaap:MeasurementInputDiscountRateMember 2018-09-30 0000790816 bdn:BulletinBuildingMember 2017-10-12 2017-10-13 0000790816 bdn:BulletinBuildingMember 2017-10-13 0000790816 bdn:BulletinBuildingMember bdn:IntangibleAssetsAcquiredMember 2017-10-12 2017-10-13 0000790816 bdn:BulletinBuildingMember bdn:BelowMarketLeaseMember 2017-10-12 2017-10-13 0000790816 bdn:BulletinBuildingMember 2017-10-16 2017-12-31 0000790816 bdn:ThreeThousandMarketStreetMember srt:OfficeBuildingMember 2017-07-28 0000790816 bdn:ThreeThousandMarketStreetMember 2017-07-28 2017-07-28 0000790816 bdn:ThreeThousandMarketStreetMember 2017-07-28 0000790816 bdn:ThreeThousandMarketStreetMember bdn:IntangibleAssetsAcquiredMember 2017-07-28 2017-07-28 0000790816 bdn:ThreeThousandMarketStreetMember bdn:BelowMarketLeaseMember 2017-07-28 2017-07-28 0000790816 bdn:ThreeThousandMarketStreetMember 2017-07-28 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A11141517And18CampusBoulevardNewtownSquareMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A630AllendaleRoadMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:TwoFourAFourBAndFiveEvesDriveEveshamCorporateCenterMember 2017-01-01 2017-12-31 0000790816 srt:RetailSiteMember bdn:A7000MidlanticDriveMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A200210220LakeDriveEastWoodlandFallsMember 2017-01-01 2017-12-31 0000790816 bdn:MixedUsePropertiesMember bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A11700117101172011740BeltsvilleDriveCalvertonMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A1200And1220ConcordAvenueInConcordMember 2017-01-01 2017-12-31 0000790816 bdn:OfficeRetailAndMixedUsePropertiesMember 2017-01-01 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A11141517And18CampusBoulevardNewtownSquareMember 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A630AllendaleRoadMember 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:TwoFourAFourBAndFiveEvesDriveEveshamCorporateCenterMember 2017-12-31 0000790816 srt:RetailSiteMember bdn:A7000MidlanticDriveMember 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A200210220LakeDriveEastWoodlandFallsMember 2017-12-31 0000790816 bdn:MixedUsePropertiesMember bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A11700117101172011740BeltsvilleDriveCalvertonMember 2017-12-31 0000790816 srt:OfficeBuildingMember bdn:A1200And1220ConcordAvenueInConcordMember 2017-12-31 0000790816 bdn:OfficeRetailAndMixedUsePropertiesMember 2017-12-31 0000790816 us-gaap:AllOtherSegmentsMember 2017-03-31 0000790816 us-gaap:AllOtherSegmentsMember 2017-03-30 2017-03-31 0000790816 us-gaap:AllOtherSegmentsMember 2017-12-31 0000790816 bdn:ImpairmentOnPropertiesHeldForUseMember us-gaap:AllOtherSegmentsMember 2017-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputCapRateMember 2017-03-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputDiscountRateMember 2017-03-31 0000790816 bdn:A200210220LakeDriveEastWoodlandFallsMember us-gaap:AllOtherSegmentsMember 2016-12-31 0000790816 bdn:A200210220LakeDriveEastWoodlandFallsMember 2016-10-01 2016-12-31 0000790816 bdn:A200210220LakeDriveEastWoodlandFallsMember 2016-12-31 0000790816 bdn:A200210220LakeDriveEastWoodlandFallsMember us-gaap:MeasurementInputCapRateMember 2016-12-31 0000790816 bdn:A200210220LakeDriveEastWoodlandFallsMember us-gaap:MeasurementInputDiscountRateMember 2016-12-31 0000790816 bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-12-31 bdn:Installment 0000790816 bdn:PhiladelphiaMarineCenterMarinePiersMember 2017-01-01 2017-12-31 0000790816 bdn:A11700117101172011740BeltsvilleDriveCalvertonMember 2016-10-01 2016-12-31 0000790816 bdn:A11700117101172011740BeltsvilleDriveCalvertonMember 2017-01-01 2017-03-31 0000790816 bdn:A1200And1220ConcordAvenueInConcordMember 2016-10-01 2016-12-31 0000790816 bdn:A1200And1220ConcordAvenueInConcordMember 2017-01-01 2017-12-31 0000790816 bdn:A2970MarketStreetMember 2017-01-01 2017-03-31 0000790816 us-gaap:LandMember bdn:A50ESwedesfordSquareMember 2017-12-31 0000790816 us-gaap:LandMember bdn:BishopsGateMember 2017-12-31 0000790816 us-gaap:LandMember bdn:GarzaRanchMultiFamilyMember 2017-12-31 0000790816 us-gaap:LandMember bdn:GatewayLandSiteCMember 2017-12-31 0000790816 us-gaap:LandMember bdn:GarzaRanchHotelMember 2017-12-31 0000790816 us-gaap:LandMember 2017-12-31 0000790816 us-gaap:LandMember bdn:A50ESwedesfordSquareMember 2017-01-01 2017-12-31 0000790816 us-gaap:LandMember bdn:BishopsGateMember 2017-01-01 2017-12-31 0000790816 us-gaap:LandMember bdn:GarzaRanchMultiFamilyMember 2017-01-01 2017-12-31 0000790816 us-gaap:LandMember bdn:GatewayLandSiteCMember 2017-01-01 2017-12-31 0000790816 us-gaap:LandMember bdn:GarzaRanchHotelMember 2017-01-01 2017-12-31 0000790816 us-gaap:LandMember 2017-01-01 2017-12-31 0000790816 bdn:BishopsGateMember us-gaap:LandMember 2016-10-01 2016-12-31 0000790816 bdn:BishopsGateMember us-gaap:LandMember 2017-04-01 2017-06-30 0000790816 bdn:BishopsGateMember us-gaap:LandMember 2017-06-30 0000790816 us-gaap:AllOtherSegmentsMember 2017-10-01 2017-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:LandMember 2017-10-01 2017-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:LandMember 2017-01-01 2017-06-30 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2017-12-31 0000790816 bdn:LandHeldForDevelopmentMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2017-12-31 0000790816 bdn:GarzaLandAcquisitionMember 2016-07-01 0000790816 bdn:GarzaLandAcquisitionMember 2016-06-29 2016-07-01 0000790816 bdn:GarzaLandAcquisitionMember 2017-12-31 0000790816 bdn:GarzaLandSaleMember 2017-01-30 0000790816 srt:OfficeBuildingMember bdn:A620640660AllendaleRoadMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A1120ExecutivePlazaMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A50EastClementonRoadMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A196198VanBurenStreetMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A2970MarketStreetMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:OchZiffPortfolioMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember 2016-01-01 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A620640660AllendaleRoadMember 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A1120ExecutivePlazaMember 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A50EastClementonRoadMember 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A196198VanBurenStreetMember 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:A2970MarketStreetMember 2016-12-31 0000790816 srt:OfficeBuildingMember bdn:OchZiffPortfolioMember 2016-12-31 0000790816 srt:OfficeBuildingMember 2016-12-31 0000790816 2016-04-01 2016-06-30 0000790816 srt:OfficeBuildingMember bdn:A196198VanBurenStreetMember 2016-01-01 2016-03-31 0000790816 srt:OfficeBuildingMember bdn:OchZiffPortfolioMember 2015-10-01 2015-12-31 0000790816 bdn:OaklandLotBMember us-gaap:LandMember 2016-12-31 0000790816 bdn:HighlandsLandMember us-gaap:LandMember 2016-12-31 0000790816 bdn:GreenhillsLandMember us-gaap:LandMember 2016-12-31 0000790816 us-gaap:LandMember 2016-12-31 0000790816 bdn:OaklandLotBMember us-gaap:LandMember 2016-01-01 2016-12-31 0000790816 bdn:HighlandsLandMember us-gaap:LandMember 2016-01-01 2016-12-31 0000790816 bdn:GreenhillsLandMember us-gaap:LandMember 2016-01-01 2016-12-31 0000790816 us-gaap:LandMember 2016-01-01 2016-12-31 0000790816 us-gaap:LandMember bdn:GreenhillsLandMember 2015-10-01 2015-12-31 0000790816 us-gaap:AllOtherSegmentsMember 2016-12-31 0000790816 us-gaap:AllOtherSegmentsMember 2016-01-01 2016-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputCapRateMember 2016-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:MeasurementInputDiscountRateMember 2016-12-31 0000790816 bdn:MetropolitanDCMember 2016-04-01 2016-06-30 0000790816 bdn:MetropolitanDCMember 2016-06-30 0000790816 bdn:MetropolitanDCMember us-gaap:MeasurementInputCapRateMember 2016-06-30 0000790816 bdn:MetropolitanDCMember us-gaap:MeasurementInputDiscountRateMember 2016-06-30 0000790816 bdn:MetropolitanDCMember 2016-03-31 0000790816 bdn:MetropolitanDCMember 2016-01-01 2016-03-31 0000790816 bdn:MetropolitanDCMember us-gaap:MeasurementInputCapRateMember 2016-03-31 0000790816 bdn:MetropolitanDCMember us-gaap:MeasurementInputDiscountRateMember 2016-03-31 0000790816 us-gaap:LandMember us-gaap:AllOtherSegmentsMember 2016-12-31 0000790816 us-gaap:LandMember us-gaap:AllOtherSegmentsMember 2016-01-01 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentOfficeMember 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentLandMember 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2016-01-01 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentOfficeMember 2016-01-01 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2016-10-01 2016-12-31 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentOfficeMember 2016-10-01 2016-12-31 0000790816 us-gaap:MeasurementInputCapRateMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2016-12-31 0000790816 us-gaap:MeasurementInputCapRateMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentOfficeMember 2016-12-31 0000790816 us-gaap:MeasurementInputDiscountRateMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:MetropolitanDCOfficeMember 2016-12-31 0000790816 us-gaap:MeasurementInputDiscountRateMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:OtherSegmentOfficeMember 2016-12-31 bdn:Real_Estate_Investment 0000790816 bdn:UnconsolidatedRealEstateVenturesMember 2018-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember bdn:SixRealEstateVenturesMember srt:OfficeBuildingMember 2018-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember bdn:TwoRealEstateVenturesMember bdn:LandHeldForDevelopmentMember 2018-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember bdn:OneRealEstateVentureMember bdn:LandUnderActiveDevelopmentMember 2018-12-31 0000790816 bdn:UnconsolidatedRealEstateVenturesMember bdn:TwoOtherRealEstateVenturesMember bdn:ResidentialTowerMember 2018-12-31 bdn:Apartment_unit 0000790816 srt:MinimumMember bdn:UnconsolidatedRealEstateVenturesMember 2018-12-31 0000790816 srt:MaximumMember bdn:UnconsolidatedRealEstateVenturesMember 2018-12-31 0000790816 bdn:RealEstateVentureMember bdn:ManagementFeesMember 2018-01-01 2018-12-31 0000790816 bdn:RealEstateVentureMember bdn:ManagementFeesMember 2017-01-01 2017-12-31 0000790816 bdn:RealEstateVentureMember bdn:ManagementFeesMember 2016-01-01 2016-12-31 0000790816 bdn:RealEstateVentureMember bdn:LeasingCommissionIncomeMember 2018-01-01 2018-12-31 0000790816 bdn:RealEstateVentureMember bdn:LeasingCommissionIncomeMember 2017-01-01 2017-12-31 0000790816 bdn:RealEstateVentureMember bdn:LeasingCommissionIncomeMember 2016-01-01 2016-12-31 0000790816 bdn:RealEstateVentureMember 2018-12-31 0000790816 bdn:RealEstateVentureMember 2017-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2018-12-31 0000790816 bdn:RockpointJointVentureMember 2018-12-31 0000790816 bdn:MAPVentureMember 2018-12-31 0000790816 bdn:PJPVIIMember 2018-12-31 0000790816 bdn:PJPIIMember 2018-12-31 0000790816 bdn:PJPVIMember 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2018-12-31 0000790816 bdn:FourTowerBridgeMember 2018-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2018-12-31 0000790816 bdn:HSREBDNILLCMember 2018-12-31 0000790816 bdn:A4040WilsonVentureMember 2018-12-31 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2018-12-31 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2018-12-31 0000790816 bdn:SevenTowerBridgeMember 2018-12-31 0000790816 bdn:TBBDNPlymouthApartmentsMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2017-12-31 0000790816 bdn:RockpointJointVentureMember 2017-12-31 0000790816 bdn:MAPVentureMember 2017-12-31 0000790816 bdn:PJPVIIMember 2017-12-31 0000790816 bdn:PJPIIMember 2017-12-31 0000790816 bdn:PJPVIMember 2017-12-31 0000790816 bdn:DRAAustinVentureMember 2017-12-31 0000790816 bdn:FourTowerBridgeMember 2017-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2017-12-31 0000790816 bdn:HSREBDNILLCMember 2017-12-31 0000790816 bdn:TBBDNPlymouthApartmentsMember 2017-12-31 0000790816 bdn:A4040WilsonVentureMember 2017-12-31 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2017-12-31 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2017-12-31 0000790816 bdn:SevenTowerBridgeMember 2017-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2018-01-01 2018-12-31 0000790816 bdn:RockpointJointVentureMember 2018-01-01 2018-12-31 0000790816 bdn:MAPVentureMember 2018-01-01 2018-12-31 0000790816 bdn:PJPVIIMember 2018-01-01 2018-12-31 0000790816 bdn:PJPIIMember 2018-01-01 2018-12-31 0000790816 bdn:PJPVIMember 2018-01-01 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2018-01-01 2018-12-31 0000790816 bdn:FourTowerBridgeMember 2018-01-01 2018-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2018-01-01 2018-12-31 0000790816 bdn:HSREBDNILLCMember 2018-01-01 2018-12-31 0000790816 bdn:TBBDNPlymouthApartmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A4040WilsonVentureMember 2018-01-01 2018-12-31 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2018-01-01 2018-12-31 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2018-01-01 2018-12-31 0000790816 bdn:SevenTowerBridgeMember 2018-01-01 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2017-01-01 2017-12-31 0000790816 bdn:RockpointJointVentureMember 2017-01-01 2017-12-31 0000790816 bdn:MAPVentureMember 2017-01-01 2017-12-31 0000790816 bdn:PJPVIIMember 2017-01-01 2017-12-31 0000790816 bdn:PJPIIMember 2017-01-01 2017-12-31 0000790816 bdn:PJPVIMember 2017-01-01 2017-12-31 0000790816 bdn:DRAAustinVentureMember 2017-01-01 2017-12-31 0000790816 bdn:FourTowerBridgeMember 2017-01-01 2017-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2017-01-01 2017-12-31 0000790816 bdn:HSREBDNILLCMember 2017-01-01 2017-12-31 0000790816 bdn:TBBDNPlymouthApartmentsMember 2017-01-01 2017-12-31 0000790816 bdn:A4040WilsonVentureMember 2017-01-01 2017-12-31 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2017-01-01 2017-12-31 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2017-01-01 2017-12-31 0000790816 bdn:SevenTowerBridgeMember 2017-01-01 2017-12-31 0000790816 bdn:SecuredJointVentureDebtMember bdn:FixedRateLoanMaturingJanuary2022Member bdn:BrandywineAlVentureLLCMember 2018-12-31 0000790816 bdn:SecuredJointVentureDebtMember bdn:FixedRateLoanMaturingJanuary2022Member bdn:BrandywineAlVentureLLCMember 2018-01-01 2018-12-31 0000790816 bdn:SecuredJointVentureDebtMember bdn:BrandywineAlVentureLLCMember 2018-12-31 0000790816 bdn:SecuredJointVentureDebtMember bdn:BrandywineAlVentureLLCMember 2018-12-27 2018-12-28 0000790816 bdn:SecuredJointVentureDebtMember bdn:BrandywineAlVentureLLCMember 2018-12-28 0000790816 bdn:HerndonInnovationCenterMetroPortfolioVentureLLCMember bdn:MetropolitanDCOfficeMember bdn:RockpointMember 2018-12-20 0000790816 bdn:MAPGroundLeaseVentureLimitedLiabilityCompanyMember 2018-08-01 0000790816 bdn:MAPGroundLeaseVentureLimitedLiabilityCompanyMember 2018-07-31 2018-08-01 0000790816 bdn:MAPGroundLeaseVentureLimitedLiabilityCompanyMember us-gaap:SecuredDebtMember 2018-08-01 0000790816 bdn:MAPGroundLeaseVentureLimitedLiabilityCompanyMember us-gaap:SecuredDebtMember 2018-07-31 2018-08-01 0000790816 bdn:MAPGroundLeaseVentureLimitedLiabilityCompanyMember us-gaap:SecuredDebtMember srt:MaximumMember 2018-08-01 0000790816 bdn:FourTowerBridgeMember 2018-01-05 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:LCORCalSTRSMember 2018-06-26 0000790816 bdn:BrandywineNineteenNineteenVenturesMember us-gaap:OtherAssetsMember 2018-06-26 0000790816 bdn:TBBDNPlymouthApartmentsMember 2017-01-31 0000790816 bdn:DRAAustinVentureMember 2018-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2018-12-31 0000790816 bdn:OtherMember 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2017-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2017-12-31 0000790816 bdn:OtherMember 2017-12-31 0000790816 bdn:EvoAtCiraDispositionMember 2018-01-10 0000790816 bdn:DRAAustinVentureMember 2018-01-01 2018-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2018-01-01 2018-12-31 0000790816 bdn:OtherMember 2018-01-01 2018-12-31 0000790816 bdn:DRAAustinVentureMember 2017-01-01 2017-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2017-01-01 2017-12-31 0000790816 bdn:OtherMember 2017-01-01 2017-12-31 0000790816 bdn:DRAAustinVentureMember 2016-01-01 2016-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2016-01-01 2016-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-01-01 2016-12-31 0000790816 bdn:OtherMember 2016-01-01 2016-12-31 0000790816 bdn:DRAAustinVentureMember 2016-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2016-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-12-31 0000790816 bdn:MAPVentureMember 2016-01-01 2016-12-31 0000790816 bdn:HerndonInnovationCenterMetroPortfolioVentureLLCMember bdn:MetropolitanDCOfficeMember 2018-07-01 2018-09-30 0000790816 bdn:AustinJointVentureMember bdn:BrandywineRealtyTrustMember 2013-10-16 0000790816 bdn:AustinJointVentureMember bdn:BrandywineRealtyTrustMember 2013-12-31 0000790816 bdn:AustinTexasMember bdn:BrandywineRealtyTrustMember 2014-12-31 0000790816 bdn:BrandywineRealtyTrustMember 2017-12-31 0000790816 bdn:DRAAdvisorsLLCMember 2017-12-31 0000790816 bdn:AustinJointVentureMember bdn:DRAAdvisorsLLCMember 2013-10-16 0000790816 bdn:AustinJointVentureMember bdn:DRAAdvisorsLLCMember 2013-10-15 2013-10-16 0000790816 bdn:FourPointsCentreMember bdn:AustinJointVentureMember srt:OfficeBuildingMember 2014-04-03 0000790816 bdn:FourPointsCentreMember 2014-04-03 bdn:Storey 0000790816 bdn:AustinJointVentureMember 2014-07-31 0000790816 bdn:AustinTexasMember 2014-07-31 0000790816 bdn:AustinJointVentureMember 2014-07-30 2014-07-31 0000790816 bdn:BrandywineRealtyTrustMember bdn:AustinJointVentureMember 2014-07-30 2014-07-31 0000790816 bdn:AustinJointVentureMember 2014-10-17 0000790816 bdn:AustinJointVentureMember 2014-10-16 2014-10-17 0000790816 bdn:RiverPlaceMember 2015-01-28 2015-01-30 0000790816 bdn:EncinoTraceLandMember 2015-12-31 0000790816 bdn:AustinJointVentureMember 2017-10-16 2017-10-18 0000790816 bdn:AustinJointVentureMember 2017-10-18 0000790816 bdn:AustinJointVentureMember 2017-10-15 2017-10-17 0000790816 bdn:AustinJointVentureMember 2017-10-17 0000790816 bdn:StationSquareImpairmentMember bdn:BrandywineAlVentureLLCMember 2012-07-10 0000790816 bdn:StationSquareImpairmentMember bdn:BrandywineAlVentureLLCMember 2016-01-01 2016-09-30 0000790816 bdn:RemainingPropertiesInRealEstateVentureMember bdn:BrandywineAlVentureLLCMember 2018-01-01 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:StationSquareAndA7101WisconsinPropertySaleMember 2018-12-27 2018-12-28 0000790816 bdn:BrandywineAlVentureLLCMember bdn:StationSquareAndA7101WisconsinPropertySaleMember 2018-12-28 0000790816 bdn:BrandywineAlVentureLLCMember 2018-12-28 0000790816 bdn:BrandywineAlVentureLLCMember bdn:StationSquareAndA7101WisconsinPropertySaleMember 2017-09-14 0000790816 bdn:BrandywineAlVentureLLCMember bdn:StationSquareAndA7101WisconsinPropertySaleMember 2017-09-13 2017-09-14 0000790816 bdn:BrandywineAlVentureLLCMember 2017-09-14 0000790816 bdn:BrandywineAlVentureLLCMember bdn:FairviewPropertiesMember 2018-01-01 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:FairviewPropertiesMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:A3130FairviewParkDriveMember 2018-01-01 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:A3130FairviewParkDriveMember us-gaap:MeasurementInputCapRateMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:A3130FairviewParkDriveMember us-gaap:MeasurementInputDiscountRateMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:A3141FairviewParkDriveMember us-gaap:MeasurementInputCapRateMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember bdn:A3141FairviewParkDriveMember us-gaap:MeasurementInputDiscountRateMember 2018-12-31 0000790816 bdn:FairviewPropertiesMember 2018-01-01 2018-12-31 0000790816 bdn:FairviewPropertiesMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputCapRateMember 2018-12-31 0000790816 srt:MinimumMember bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputDiscountRateMember 2018-12-31 0000790816 srt:MaximumMember bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputDiscountRateMember 2018-12-31 0000790816 bdn:BrandywineAlVentureLLCMember 2017-09-30 0000790816 bdn:BrandywineAlVentureLLCMember 2017-01-01 2017-09-30 0000790816 bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputCapRateMember 2017-09-30 0000790816 srt:MinimumMember bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputDiscountRateMember 2017-09-30 0000790816 srt:MaximumMember bdn:BrandywineAlVentureLLCMember us-gaap:MeasurementInputDiscountRateMember 2017-09-30 0000790816 bdn:MAPVentureMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2016-02-04 0000790816 bdn:MAPVentureMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2016-02-03 2016-02-04 0000790816 bdn:MAPVentureMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0000790816 bdn:MAPVentureMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2011-01-20 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:UnaffiliatedThirdPartyMember 2011-01-20 0000790816 bdn:UnaffiliatedThirdPartyMember 2014-10-15 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2011-01-01 2011-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:LCORCalSTRSMember 2014-10-21 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:LCORCalSTRSMember 2014-10-20 2014-10-21 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2014-10-27 0000790816 bdn:BrandywineNineteenNineteenVenturesMember 2014-10-26 2014-10-27 bdn:NumberofCar. 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:LCORCalSTRSMember 2017-12-31 0000790816 bdn:BrandywineNineteenNineteenVenturesMember bdn:LCORCalSTRSMember 2018-01-01 2018-12-31 0000790816 bdn:FourTowerBridgeMember bdn:ConshohockenMember stpr:PA 2018-01-05 0000790816 bdn:FourTowerBridgeMember 2018-01-04 2018-01-05 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2013-01-25 bdn:Bed 0000790816 bdn:EvoAtCiraCentreSouthVentureMember bdn:CampusCrestPropertiesLLCMember 2013-01-25 0000790816 bdn:EvoAtCiraCentreSouthVentureMember bdn:HSRELLCMember 2013-01-25 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2013-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-03-02 0000790816 bdn:HSRELLCMember bdn:EvoAtCiraCentreSouthVentureMember 2016-03-02 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-03-01 2016-03-02 0000790816 bdn:HSRELLCMember bdn:EvoAtCiraCentreSouthVentureMember 2016-03-01 2016-03-02 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-06-10 0000790816 bdn:EvoAtCiraCentreSouthVentureMember 2016-06-09 2016-06-10 0000790816 bdn:EvoAtCiraCentreSouthVentureMember us-gaap:SecuredDebtMember 2016-06-10 0000790816 bdn:EvoAtCiraCentreSouthVentureMember us-gaap:SecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:EvoAtCiraCentreSouthVentureMember us-gaap:SecuredDebtMember us-gaap:LondonInterbankOfferedRateLIBORMember 2016-06-09 2016-06-10 0000790816 bdn:EvoAtCiraCentreSouthVentureMember us-gaap:SecuredDebtMember srt:MaximumMember 2016-06-10 0000790816 bdn:EvoAtCiraCentreSouthVentureMember us-gaap:SecuredDebtMember 2016-06-09 2016-06-10 0000790816 bdn:EvoAtCiraDispositionMember bdn:PhiladelphiaMember stpr:PA 2018-01-10 0000790816 bdn:EvoAtCiraDispositionMember 2018-01-09 2018-01-10 0000790816 bdn:TBBDNPlymouthApartmentsMember 2017-01-29 2017-01-31 0000790816 bdn:TBBDNPlymouthApartmentsMember bdn:PennsylvaniaMember 2017-01-31 0000790816 bdn:TBBDNPlymouthApartmentsMember bdn:UnconsolidatedRealEstateVenturesMember 2017-01-29 2017-01-31 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2015-05-29 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2015-05-29 0000790816 bdn:JBGDCManagerMember bdn:A51N50PattersonHoldingsLLCVentureMember 2015-05-29 0000790816 bdn:JBGDCManagerMember bdn:A1250FirstStreetOfficeLLCVentureMember 2015-05-29 0000790816 bdn:A51N50PattersonHoldingsLLCVentureMember 2015-05-27 2015-05-29 0000790816 bdn:A1250FirstStreetOfficeLLCVentureMember 2015-05-27 2015-05-29 0000790816 bdn:JBGDCManagerMember bdn:A51N50PattersonHoldingsLLCVentureMember 2015-05-27 2015-05-29 0000790816 bdn:JBGDCManagerMember bdn:A1250FirstStreetOfficeLLCVentureMember 2015-05-27 2015-05-29 0000790816 bdn:A4040WilsonVentureMember 2016-12-31 0000790816 bdn:AshtonParkMember bdn:A4040WilsonVentureMember 2013-07-31 0000790816 bdn:A4040WilsonVentureMember bdn:MixedUsePropertyMember 2013-07-31 0000790816 bdn:A4040WilsonVentureMember 2013-07-31 0000790816 bdn:BrandywineRealtyTrustMember bdn:A4040WilsonVentureMember 2013-07-30 2013-07-31 0000790816 bdn:BrandywineRealtyTrustMember bdn:A4040WilsonVentureMember 2018-12-31 0000790816 bdn:AshtonParkMember bdn:A4040WilsonVentureMember 2018-12-31 0000790816 us-gaap:RevolvingCreditFacilityMember 2018-12-31 0000790816 us-gaap:RevolvingCreditFacilityMember 2017-12-31 0000790816 us-gaap:LeasesAcquiredInPlaceMember 2018-12-31 0000790816 us-gaap:CustomerRelationshipsMember 2018-12-31 0000790816 us-gaap:AboveMarketLeasesMember 2018-12-31 0000790816 bdn:BelowMarketLeasesAcquiredIncludingLiabilitiesOfAssetsHeldForSaleMember 2018-12-31 0000790816 us-gaap:LeasesAcquiredInPlaceMember 2017-12-31 0000790816 us-gaap:CustomerRelationshipsMember 2017-12-31 0000790816 us-gaap:AboveMarketLeasesMember 2017-12-31 0000790816 bdn:BelowMarketLeasesAcquiredIncludingLiabilitiesOfAssetsHeldForSaleMember 2017-12-31 0000790816 bdn:TenantMoveOutsPriorToEndOfLeaseTermMember 2018-01-01 2018-12-31 0000790816 bdn:TenantMoveOutsPriorToEndOfLeaseTermMember 2017-01-01 2017-12-31 0000790816 bdn:TenantMoveOutsPriorToEndOfLeaseTermMember 2016-01-01 2016-12-31 0000790816 bdn:TwoLoganSquareMember us-gaap:SecuredDebtMember 2018-12-31 0000790816 bdn:TwoLoganSquareMember us-gaap:SecuredDebtMember 2017-12-31 0000790816 bdn:FourTowerBridgeMember us-gaap:SecuredDebtMember 2018-12-31 0000790816 bdn:FourTowerBridgeMember us-gaap:SecuredDebtMember 2017-12-31 0000790816 bdn:OneCommerceSquareMember us-gaap:SecuredDebtMember 2018-12-31 0000790816 bdn:OneCommerceSquareMember us-gaap:SecuredDebtMember 2017-12-31 0000790816 bdn:TwoCommerceSquareMember us-gaap:SecuredDebtMember 2018-12-31 0000790816 bdn:TwoCommerceSquareMember us-gaap:SecuredDebtMember 2017-12-31 0000790816 us-gaap:SecuredDebtMember 2018-12-31 0000790816 us-gaap:SecuredDebtMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:UnsecuredCreditFacilityMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:UnsecuredCreditFacilityMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:SevenYearTermLoanMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:SevenYearTermLoanMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2023Member 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2023Member 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2024Member 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2024Member 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2027Member 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2027Member 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2029Member 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2029Member 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIaPreferredTrustIMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIaPreferredTrustIMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIbPreferredTrustIMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIbPreferredTrustIMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIiPreferredTrustIiMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:IndentureIiPreferredTrustIiMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember 2017-12-31 0000790816 bdn:UnsecuredCreditFacilityMember us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:IndentureIaPreferredTrustIMember us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:TwoLoganSquareMember us-gaap:SecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:FourTowerBridgeMember us-gaap:SecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:OneCommerceSquareMember us-gaap:SecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:TwoCommerceSquareMember us-gaap:SecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:SevenYearTermLoanMember us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:Note2023Member us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:Note2024Member us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:Note2027Member us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:Note2029Member us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:IndentureIbPreferredTrustIMember us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:IndentureIiPreferredTrustIiMember us-gaap:UnsecuredDebtMember 2018-01-01 2018-12-31 0000790816 bdn:SevenYearTermLoanMember us-gaap:UnsecuredDebtMember srt:MinimumMember 2018-01-01 2018-12-31 0000790816 bdn:SevenYearTermLoanMember us-gaap:UnsecuredDebtMember srt:MaximumMember 2018-01-01 2018-12-31 0000790816 us-gaap:SecuredDebtMember 2016-12-31 0000790816 us-gaap:RevolvingCreditFacilityMember bdn:NewCreditFacilityMember 2018-07-17 0000790816 bdn:PriorRevolvingCreditFacilityMember 2018-07-16 2018-07-17 0000790816 us-gaap:RevolvingCreditFacilityMember bdn:NewCreditFacilityMember 2018-07-16 2018-07-17 bdn:Extension 0000790816 bdn:NewCreditFacilityMember srt:MinimumMember us-gaap:LondonInterbankOfferedRateLIBORMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember srt:MaximumMember us-gaap:LondonInterbankOfferedRateLIBORMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember us-gaap:FederalFundsEffectiveSwapRateMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember us-gaap:LondonInterbankOfferedRateLIBORMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember srt:MinimumMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 bdn:NewCreditFacilityMember srt:MaximumMember us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 us-gaap:RevolvingCreditFacilityMember 2018-01-01 2018-12-31 0000790816 us-gaap:RevolvingCreditFacilityMember 2017-01-01 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2027Member 2017-11-09 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2023Member 2017-11-09 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2027Member 2017-11-08 2017-11-09 0000790816 us-gaap:UnsecuredDebtMember bdn:Note2023Member 2017-11-08 2017-11-09 0000790816 us-gaap:UnsecuredDebtMember bdn:Notes2027And2023Member 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember bdn:Notes2027And2023Member 2017-11-08 2017-11-09 0000790816 bdn:NotesTwoThousandEighteenMember us-gaap:UnsecuredDebtMember 2017-11-16 0000790816 bdn:NotesTwoThousandEighteenMember us-gaap:UnsecuredDebtMember 2017-11-15 2017-11-16 0000790816 us-gaap:UnsecuredDebtMember bdn:NotesTwoThousandEighteenMember 2017-12-18 0000790816 us-gaap:UnsecuredDebtMember bdn:NotesTwoThousandEighteenMember 2017-12-17 2017-12-18 0000790816 bdn:NotesTwoThousandEighteenMember 2018-01-01 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2017-12-31 0000790816 bdn:VariableRateDebtMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000790816 bdn:VariableRateDebtMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2017-12-31 0000790816 us-gaap:MortgagesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:MortgagesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2017-12-31 0000790816 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2017-12-31 0000790816 us-gaap:UnsecuredDebtMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:UnsecuredDebtMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000790816 bdn:VariableRateDebtMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000790816 bdn:VariableRateDebtMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000790816 us-gaap:MortgagesMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:MortgagesMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000790816 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000790816 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000790816 bdn:ThirdPartyMember 2018-12-31 0000790816 bdn:ThirdPartyMember bdn:ThroughMarch2019Member 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyMember bdn:ThereafterUntilMarchOf2020Member 2018-01-01 2018-12-31 0000790816 bdn:ThirdPartyMember 2018-01-01 2018-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3718InterestRateSwapMaturingOctober82022Member 2018-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3300InterestRateSwapMaturingJanuary302021Member 2018-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3090InterestRateSwapMaturingOctober302019Member 2018-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3718InterestRateSwapMaturingOctober82022Member 2017-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3300InterestRateSwapMaturingJanuary302021Member 2017-12-31 0000790816 us-gaap:CashFlowHedgingMember bdn:A3090InterestRateSwapMaturingOctober302019Member 2017-12-31 0000790816 bdn:RedeemableCommonLimitedPartnershipUnitsMember 2018-01-01 2018-12-31 0000790816 bdn:RedeemableCommonLimitedPartnershipUnitsMember 2017-01-01 2017-12-31 0000790816 bdn:RedeemableCommonLimitedPartnershipUnitsMember 2016-01-01 2016-12-31 0000790816 us-gaap:DividendDeclaredMember 2018-12-31 0000790816 2018-12-30 2018-12-31 0000790816 us-gaap:SeriesEPreferredStockMember srt:SubsidiariesMember 2017-04-11 2017-04-11 0000790816 us-gaap:SeriesEPreferredStockMember srt:SubsidiariesMember 2017-04-11 0000790816 srt:MaximumMember us-gaap:SubsequentEventMember 2019-01-03 0000790816 bdn:OfferingProgramMember 2017-01-10 0000790816 bdn:OfferingProgramMember 2017-01-09 2017-01-10 0000790816 bdn:OfferingProgramMember 2017-01-01 2017-12-31 0000790816 bdn:OfferingProgramMember 2018-01-01 2018-12-31 0000790816 bdn:OfferingProgramMember 2017-12-31 0000790816 bdn:OfferingProgramMember 2018-12-31 0000790816 bdn:ClassUnitsMember 2018-12-31 0000790816 bdn:ClassUnitsMember 2017-12-31 0000790816 bdn:ClassUnitsMember 2016-12-31 0000790816 us-gaap:DividendDeclaredMember srt:SubsidiariesMember 2018-12-06 0000790816 srt:SubsidiariesMember 2018-12-06 2018-12-06 0000790816 bdn:OfferingProgramMember 2016-01-01 2016-12-31 0000790816 us-gaap:EmployeeStockOptionMember 2018-01-01 2018-12-31 0000790816 us-gaap:EmployeeStockOptionMember 2016-01-01 2016-12-31 0000790816 us-gaap:RestrictedStockMember 2018-12-31 0000790816 us-gaap:RestrictedStockMember srt:MaximumMember 2018-01-01 2018-12-31 0000790816 us-gaap:RestrictedStockMember srt:MinimumMember 2018-01-01 2018-12-31 0000790816 us-gaap:RestrictedStockMember 2018-01-01 2018-12-31 0000790816 us-gaap:RestrictedStockMember 2017-01-01 2017-12-31 0000790816 us-gaap:RestrictedStockMember 2016-01-01 2016-12-31 0000790816 us-gaap:RestrictedStockMember 2017-12-31 0000790816 us-gaap:RestrictedStockMember bdn:CliffVestingMember us-gaap:ExecutiveOfficerMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember bdn:NonOfficerEmployeesMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember us-gaap:ExecutiveOfficerMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember us-gaap:ShareBasedCompensationAwardTrancheOneMember bdn:NonOfficerEmployeesMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember us-gaap:ShareBasedCompensationAwardTrancheTwoMember bdn:NonOfficerEmployeesMember 2018-02-27 2018-02-28 0000790816 us-gaap:RestrictedStockMember us-gaap:ShareBasedCompensationAwardTrancheThreeMember bdn:NonOfficerEmployeesMember 2018-02-27 2018-02-28 0000790816 bdn:February222016RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2017-12-31 0000790816 bdn:March012017RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2017-12-31 0000790816 bdn:February282018RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2017-12-31 0000790816 us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2017-12-31 0000790816 bdn:February222016RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-01-01 2018-12-31 0000790816 bdn:March012017RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-01-01 2018-12-31 0000790816 bdn:February282018RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-01-01 2018-12-31 0000790816 us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-01-01 2018-12-31 0000790816 bdn:February222016RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-12-31 0000790816 bdn:March012017RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-12-31 0000790816 bdn:February282018RSPUGrantMember us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-12-31 0000790816 us-gaap:ExecutiveOfficerMember bdn:RestrictedPerformanceShareUnitsPlanMember 2018-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2016-02-22 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2017-03-01 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2018-02-28 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2016-02-21 2016-02-22 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2017-02-28 2017-03-01 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember us-gaap:ExecutiveOfficerMember 2018-02-27 2018-02-28 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember bdn:CliffVestingMember us-gaap:ExecutiveOfficerMember 2018-01-01 2018-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2018-01-01 2018-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2017-01-01 2017-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2016-01-01 2016-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2018-12-31 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2018-02-01 2018-02-01 0000790816 bdn:RestrictedPerformanceShareUnitsPlanMember 2018-02-09 0000790816 bdn:EmployeeSharePurchasePlanMember 2018-01-01 2018-12-31 0000790816 bdn:EmployeeSharePurchasePlanMember 2018-12-31 0000790816 bdn:EmployeeSharePurchasePlanMember 2017-01-01 2017-12-31 0000790816 bdn:EmployeeSharePurchasePlanMember 2016-01-01 2016-12-31 0000790816 2017-12-18 0000790816 us-gaap:OtherAssetsMember 2018-12-31 0000790816 us-gaap:OtherAssetsMember 2017-12-31 bdn:segment 0000790816 bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:PhiladelphiaCBDMember 2017-12-31 0000790816 bdn:PhiladelphiaCBDMember 2016-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2018-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2017-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2016-12-31 0000790816 bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:MetropolitanDCMember 2017-12-31 0000790816 bdn:MetropolitanDCMember 2016-12-31 0000790816 bdn:AustinTexasMember 2018-12-31 0000790816 bdn:AustinTexasMember 2017-12-31 0000790816 bdn:AustinTexasMember 2016-12-31 bdn:Office 0000790816 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:LandHeldForDevelopmentMember 2018-12-31 0000790816 bdn:PennsylvaniaSuburbsMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:LandHeldForDevelopmentMember 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:LandHeldForDevelopmentMember 2018-12-31 0000790816 us-gaap:AllOtherSegmentsMember us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember bdn:LandHeldForDevelopmentMember 2017-12-31 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeAndThreeThousandTwentyFiveJFKBoulevardMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PennsylvaniaSuburbsMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PhiladelphiaCBDMember 2017-01-01 2017-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PennsylvaniaSuburbsMember 2017-01-01 2017-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:MetropolitanDCMember 2017-01-01 2017-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:AustinTexasMember 2017-01-01 2017-12-31 0000790816 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2017-01-01 2017-12-31 0000790816 us-gaap:CorporateNonSegmentMember 2017-01-01 2017-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PhiladelphiaCBDMember 2016-01-01 2016-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:PennsylvaniaSuburbsMember 2016-01-01 2016-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:MetropolitanDCMember 2016-01-01 2016-12-31 0000790816 us-gaap:OperatingSegmentsMember bdn:AustinTexasMember 2016-01-01 2016-12-31 0000790816 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2016-01-01 2016-12-31 0000790816 us-gaap:CorporateNonSegmentMember 2016-01-01 2016-12-31 0000790816 bdn:MAPVentureMember 2018-12-31 0000790816 bdn:MAPVentureMember 2017-12-31 0000790816 bdn:MAPVentureMember 2016-12-31 0000790816 bdn:MAPVentureMember 2018-01-01 2018-12-31 0000790816 bdn:PhiladelphiaCBDMember 2017-01-01 2017-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2017-01-01 2017-12-31 0000790816 bdn:MetropolitanDCMember 2017-01-01 2017-12-31 0000790816 bdn:MAPVentureMember 2017-01-01 2017-12-31 0000790816 us-gaap:AllOtherSegmentsMember 2017-01-01 2017-12-31 0000790816 bdn:AustinTexasMember 2017-01-01 2017-12-31 0000790816 bdn:PhiladelphiaCBDMember 2016-01-01 2016-12-31 0000790816 bdn:PennsylvaniaSuburbsMember 2016-01-01 2016-12-31 0000790816 bdn:MetropolitanDCMember 2016-01-01 2016-12-31 0000790816 bdn:MAPVentureMember 2016-01-01 2016-12-31 0000790816 bdn:AustinTexasMember 2016-01-01 2016-12-31 0000790816 us-gaap:MortgagesMember 2018-12-31 0000790816 srt:MinimumMember 2018-12-31 0000790816 srt:MaximumMember 2018-12-31 0000790816 bdn:A618MarketStreetMember 2015-04-02 0000790816 bdn:A618MarketStreetMember 2015-04-01 2015-04-02 0000790816 bdn:A618MarketStreetMember 2018-12-31 0000790816 bdn:A4040WilsonVentureMember 2018-12-31 0000790816 bdn:TheBulletinBuildingMember srt:MinimumMember 2018-12-31 0000790816 bdn:TheBulletinBuildingMember 2018-01-01 2018-12-31 0000790816 bdn:TheBulletinBuildingMember 2018-12-31 0000790816 bdn:TheBulletinBuildingMember 2017-10-13 0000790816 bdn:DrexelSquareMember 2018-12-31 0000790816 bdn:TwoLoganSquareMember 2018-01-01 2018-12-31 0000790816 bdn:TwoLoganSquareMember 2018-12-31 0000790816 bdn:TwoLoganSquareMember 2004-01-01 2004-09-30 0000790816 bdn:OneandTwoCommerceSquareMember bdn:PrentissPropertiesTrustMember 2018-12-31 0000790816 bdn:OneCommerceSquareMember 2018-12-31 0000790816 bdn:TwoCommerceSquareMember 2018-12-31 0000790816 us-gaap:SubsequentEventMember 2019-01-03 0000790816 us-gaap:SubsequentEventMember 2019-01-01 2019-01-31 0000790816 2018-01-01 2018-03-31 0000790816 2018-04-01 2018-06-30 0000790816 2018-07-01 2018-09-30 0000790816 2018-10-01 2018-12-31 0000790816 2017-01-01 2017-03-31 0000790816 2017-04-01 2017-06-30 0000790816 2017-07-01 2017-09-30 0000790816 2017-10-01 2017-12-31 0000790816 bdn:MetropolitanDCOfficeMember 2018-07-01 2018-09-30 0000790816 bdn:MetropolitanDCOfficeMember 2018-09-30 0000790816 bdn:DRAAustinVentureMember 2018-10-01 2018-12-31 0000790816 srt:SubsidiariesMember 2018-01-01 2018-03-31 0000790816 srt:SubsidiariesMember 2018-04-01 2018-06-30 0000790816 srt:SubsidiariesMember 2018-07-01 2018-09-30 0000790816 srt:SubsidiariesMember 2018-10-01 2018-12-31 0000790816 srt:SubsidiariesMember 2017-01-01 2017-03-31 0000790816 srt:SubsidiariesMember 2017-04-01 2017-06-30 0000790816 srt:SubsidiariesMember 2017-07-01 2017-09-30 0000790816 srt:SubsidiariesMember 2017-10-01 2017-12-31 0000790816 bdn:MetropolitanDCOfficeMember srt:SubsidiariesMember 2018-07-01 2018-09-30 0000790816 bdn:MetropolitanDCOfficeMember srt:SubsidiariesMember 2018-09-30 0000790816 bdn:DRAAustinVentureMember srt:SubsidiariesMember 2018-10-01 2018-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2017-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2016-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2015-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2018-01-01 2018-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2017-01-01 2017-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2016-01-01 2016-12-31 0000790816 us-gaap:AllowanceForCreditLossMember 2018-12-31 0000790816 bdn:A400BerwynParkMember stpr:PA 2018-12-31 0000790816 bdn:A300BerwynParkMember stpr:PA 2018-12-31 0000790816 bdn:A1050WestlakesDriveMember stpr:PA 2018-12-31 0000790816 bdn:A1200SwedesfordRoadMember stpr:PA 2018-12-31 0000790816 bdn:A200BerwynParkMember stpr:PA 2018-12-31 0000790816 bdn:A1180SwedesfordRoadMember stpr:PA 2018-12-31 0000790816 bdn:A100BerwynParkMember stpr:PA 2018-12-31 0000790816 bdn:A1160SwedesfordRoadMember stpr:PA 2018-12-31 0000790816 bdn:A1100CassettRoadMember stpr:PA 2018-12-31 0000790816 bdn:SixTowerBridge181WashingtonStreetMember stpr:PA 2018-12-31 0000790816 bdn:A52SwedesfordSquareMember stpr:PA 2018-12-31 0000790816 bdn:A640FreedomBusinessCenterMember stpr:PA 2018-12-31 0000790816 bdn:A620FreedomBusinessCenterMember stpr:PA 2018-12-31 0000790816 bdn:A1000FirstAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A1060FirstAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A630FreedomBusinessCenterDriveMember stpr:PA 2018-12-31 0000790816 bdn:A1020FirstAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A1040FirstAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A610FreedomBusinessCenterDriveMember stpr:PA 2018-12-31 0000790816 bdn:A650ParkAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A600ParkAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A933FirstAvenueMember stpr:PA 2018-12-31 0000790816 bdn:A500NorthGulphRoadMember stpr:PA 2018-12-31 0000790816 bdn:A401PlymouthRoadMember stpr:PA 2018-12-31 0000790816 bdn:Metroplex4000ChemicalRoadMember stpr:PA 2018-12-31 0000790816 bdn:A610WestGermantownPikeMember stpr:PA 2018-12-31 0000790816 bdn:A600WestGermantownPikeMember stpr:PA 2018-12-31 0000790816 bdn:A630WestGermantownPikeMember stpr:PA 2018-12-31 0000790816 bdn:A620WestGermantownPikeMember stpr:PA 2018-12-31 0000790816 bdn:A660WestGermantownPikeMember stpr:PA 2018-12-31 0000790816 bdn:A351PlymouthRoadMember stpr:PA 2018-12-31 0000790816 bdn:A150RadnorChesterRoadMember stpr:PA 2018-12-31 0000790816 bdn:OneRadnorCorporateCenterMember stpr:PA 2018-12-31 0000790816 bdn:A201KingOfPrussiaRoadMember stpr:PA 2018-12-31 0000790816 bdn:A555LancasterAvenueMember stpr:PA 2018-12-31 0000790816 bdn:FourRadnorCorporateCenterMember stpr:PA 2018-12-31 0000790816 bdn:FiveRadnorCorporateCenterMember stpr:PA 2018-12-31 0000790816 bdn:ThreeRadnorCorporateCenterMember stpr:PA 2018-12-31 0000790816 bdn:TwoRadnorCorporateCenterMember stpr:PA 2018-12-31 0000790816 bdn:A130RadnorChesterRoadMember stpr:PA 2018-12-31 0000790816 bdn:A170RadnorChesterRoadMember stpr:PA 2018-12-31 0000790816 bdn:A200NRadnorChesterRdMember stpr:PA 2018-12-31 0000790816 bdn:A101WestElmStreetMember stpr:PA 2018-12-31 0000790816 bdn:A1WestElmStreetMember stpr:PA 2018-12-31 0000790816 bdn:FourTowerBridge200BarrHarborDriveMember stpr:PA 2018-12-31 0000790816 bdn:A400BerwynParkMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A300BerwynParkMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1050WestlakesDriveMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1200SwedesfordRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A200BerwynParkMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1180SwedesfordRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A100BerwynParkMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1160SwedesfordRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1100CassettRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:SixTowerBridge181WashingtonStreetMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A52SwedesfordSquareMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A640FreedomBusinessCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A620FreedomBusinessCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1000FirstAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1060FirstAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A630FreedomBusinessCenterDriveMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1020FirstAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1040FirstAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A610FreedomBusinessCenterDriveMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A650ParkAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A600ParkAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A933FirstAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A500NorthGulphRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A401PlymouthRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:Metroplex4000ChemicalRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A610WestGermantownPikeMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A600WestGermantownPikeMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A630WestGermantownPikeMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A620WestGermantownPikeMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A660WestGermantownPikeMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A150RadnorChesterRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:OneRadnorCorporateCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A201KingOfPrussiaRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A555LancasterAvenueMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:FourRadnorCorporateCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:FiveRadnorCorporateCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:ThreeRadnorCorporateCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:TwoRadnorCorporateCenterMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A130RadnorChesterRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A170RadnorChesterRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A200NRadnorChesterRdMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A101WestElmStreetMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A1WestElmStreetMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:FourTowerBridge200BarrHarborDriveMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:A351PlymouthRoadMember stpr:PA 2018-01-01 2018-12-31 0000790816 bdn:CiraCentre2929ArchStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:ThreeLoganSquare1717ArchStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:TwoCommerceSquare2001MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:OneLoganSquare130North18thStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:TwoLoganSquare100North18thStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:OneCommerceSquare2005MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:CiraCentreSouthGarage129South30thStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A1900MarketMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A3020MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:TheLiftAtJuniperStreet101103JuniperStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A618634MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:FMCTowerAtCiraCentreSouth2929WalnutStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A2100MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A3000MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:TheBulletinBuilding3025MarketStreetMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeJFKBoulevardMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:ThreeThousandTwentyFiveJFKBoulevardMember bdn:PhiladelphiaCBDMember 2018-12-31 0000790816 bdn:A6600RockledgeDriveMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A2340DullesCornerBoulevardMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A1676InternationalDriveMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A8260GreensboroDriveMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A2273ResearchBoulevardMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A2275ResearchBoulevardMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A2277ResearchBoulevardMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A1900GallowsRoadMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A8521LeesburgPikeMember bdn:MetropolitanDCMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding1Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding2Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding3Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding4Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding5Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding6Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding8Member bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A11501BurnetRoadParkingGarageMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:OneBartonSkyway1501SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:TwoBartonSkyway1601SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:ThreeBartonSkyway1221SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:FourBartonSkyway1301SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:CiraCentre2929ArchStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:ThreeLoganSquare1717ArchStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TwoCommerceSquare2001MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:OneLoganSquare130North18thStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TwoLoganSquare100North18thStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:OneCommerceSquare2005MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:CiraCentreSouthGarage129South30thStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:A1900MarketMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:A3020MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TheLiftAtJuniperStreet101103JuniperStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:A618634MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:FMCTowerAtCiraCentreSouth2929WalnutStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:A3000MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:TheBulletinBuilding3025MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:A6600RockledgeDriveMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A2340DullesCornerBoulevardMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A1676InternationalDriveMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A8260GreensboroDriveMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A2273ResearchBoulevardMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A2275ResearchBoulevardMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A2277ResearchBoulevardMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A1900GallowsRoadMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A8521LeesburgPikeMember bdn:MetropolitanDCMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding1Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding2Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding3Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding4Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding5Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding6Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadBuilding8Member bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A11501BurnetRoadParkingGarageMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:OneBartonSkyway1501SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:TwoBartonSkyway1601SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:ThreeBartonSkyway1221SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:FourBartonSkyway1301SouthMoPacExpresswayMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A2100MarketStreetMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:ThreeThousandOneAndThreeThousandThreeJFKBoulevardMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:ThreeThousandTwentyFiveJFKBoulevardMember bdn:PhiladelphiaCBDMember 2018-01-01 2018-12-31 0000790816 bdn:FourPointsCentre11305FourPointsDriveMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingOne6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingTwo6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingThree6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingFour6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingFive6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingSix6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:RiverPlaceBuildingSeven6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:QuarryLakeII4516SetonCenterParkwayMember bdn:AustinTexasMember 2018-12-31 0000790816 bdn:A10FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A7FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A2FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A4FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A1FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A5USAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A5FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:MainStreetPlaza1000Member us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:MainStreetPiazzaMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:MainStreetPromenadeMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A920NorthKingStreetMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:A300DelawareAvenueMember us-gaap:AllOtherSegmentsMember 2018-12-31 0000790816 bdn:FourPointsCentre11305FourPointsDriveMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingOne6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingTwo6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingThree6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingFour6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingFive6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingSix6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:RiverPlaceBuildingSeven6500RiverPlaceBoulevardMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:QuarryLakeII4516SetonCenterParkwayMember bdn:AustinTexasMember 2018-01-01 2018-12-31 0000790816 bdn:A10FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A7FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A2FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A4FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A1FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A5USAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A5FosterAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:MainStreetPlaza1000Member us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:MainStreetPiazzaMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:MainStreetPromenadeMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A920NorthKingStreetMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:A300DelawareAvenueMember us-gaap:AllOtherSegmentsMember 2018-01-01 2018-12-31 0000790816 bdn:AccumulatedDepreciationIncludingHFSMember 2018-12-31 0000790816 bdn:AccumulatedDepreciationIncludingHFSMember 2017-12-31 0000790816 bdn:AccumulatedDepreciationIncludingHFSMember 2016-12-31 0000790816 bdn:A618634MarketStreetMember bdn:PhiladelphiaCBDMember bdn:ParkingStructureMember 2018-01-01 2018-12-31 0000790816 bdn:LeasholdInterestLandMember 2018-12-31 0000790816 bdn:LandParcelOneMember 2018-01-01 2018-12-31 0000790816 bdn:LandParcelTwoMember 2018-01-01 2018-12-31

 

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

OR

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                    to                   

Commission file number

001-9106 (Brandywine Realty Trust)

000-24407 (Brandywine Operating Partnership, L.P.)

Brandywine Realty Trust

Brandywine Operating Partnership, L.P.

(Exact name of registrant as specified in its charter)

 

MARYLAND (Brandywine Realty Trust)

23-2413352

DELAWARE (Brandywine Operating Partnership L.P.)

23-2862640

(State or other jurisdiction of incorporation or organization)

(I.R.S. Employer Identification No.)

 

 

2929 Walnut Street

Suite 1700

 

Philadelphia, Pennsylvania

19104

(Address of principal executive offices)

(Zip Code)

 

Registrant’s telephone number, including area code (610) 325-5600

Securities registered pursuant to Section 12(b) of the Act:

 

Title of each class

Name of each exchange on which registered

Common Shares of Beneficial Interest,

New York Stock Exchange

par value $0.01 per share

 

(Brandywine Realty Trust)

 

 

Securities registered pursuant to Section 12(g) of the Act:

Units of General Partnership Interest (Brandywine Operating Partnership, L.P.)

(Title of class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

 

Brandywine Realty Trust

Yes   No 

Brandywine Operating Partnership, L.P.

Yes   No 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

 

Brandywine Realty Trust

Yes   No 

Brandywine Operating Partnership, L.P.

Yes   No 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

 

Brandywine Realty Trust

Yes   No 

Brandywine Operating Partnership, L.P.

Yes   No 

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

 

Brandywine Realty Trust

Yes   No 

Brandywine Operating Partnership, L.P.

Yes   No 

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

Brandywine Realty Trust:

Large accelerated filer 

 

Accelerated filer 

Non-accelerated filer 

 

Smaller reporting company 

 

 

Emerging growth company 

If an emerging growth company, indicate by check mark whether the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of Exchange Act.

Brandywine Operating Partnership, L.P.:

Large accelerated filer 

 

Accelerated filer 

Non-accelerated filer 

 

Smaller reporting company 

 

 

Emerging growth company 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

 

Brandywine Realty Trust

Yes   No 

Brandywine Operating Partnership, L.P.

Yes   No 

As of June 30, 2018, the aggregate market value of the Common Shares of Beneficial Interest held by non-affiliates of Brandywine Realty Trust was $2,970,155,345 based upon the last reported sale price of $16.88 per share on the New York Stock Exchange on June 30, 2018. An aggregate of 175,813,097 Common Shares of Beneficial Interest was outstanding as of February 15, 2019.

As of June 30, 2018 the aggregate market value of the 1,479,799 common units of limited partnership (“Units”) held by non-affiliates of Brandywine Operating Partnership, L.P. was $24,979,007 based upon the last reported sale price of $16.88 per share on the New York Stock Exchange on June 30, 2018 of the Common Shares of Beneficial Interest of Brandywine Realty Trust, the sole general partner of Brandywine Operating Partnership, L.P. (For this computation, the Registrant has excluded the market value of all Units beneficially owned by Brandywine Realty Trust.)

Documents Incorporated By Reference

Portions of the proxy statement for the 2019 Annual Meeting of Shareholders of Brandywine Realty Trust are incorporated by reference into Part III of this Form 10-K.

 

 

 

 


EXPLANATORY NOTE

This report combines the annual reports on Form 10-K for the year ended December 31, 2018 of Brandywine Realty Trust (the “Parent Company”) and Brandywine Operating Partnership, L.P. (the “Operating Partnership”). The Parent Company is a Maryland real estate investment trust, or REIT, that owns its assets and conducts its operations through the Operating Partnership, a Delaware limited partnership, and subsidiaries of the Operating Partnership. The Parent Company, the Operating Partnership and their consolidated subsidiaries are collectively referred to in this report as the “Company.” In addition, terms such as “we”, “us”, or “our” used in this report may refer to the Company, the Parent Company, or the Operating Partnership.

The Parent Company is the sole general partner of the Operating Partnership and as of December 31, 2018, owned a 99.4% interest in the Operating Partnership. The remaining 0.6% interest consists of common units of limited partnership interest issued by the Operating Partnership to third parties in exchange for contributions of properties to the Operating Partnership. As the sole general partner of the Operating Partnership, the Parent Company has full and complete authority over the Operating Partnership’s day-to-day operations and management.

As general partner with control of the Operating Partnership, the Parent Company consolidates the Operating Partnership for financial reporting purposes, and the Parent Company does not have significant assets other than its investment in the Operating Partnership. Therefore, the assets and liabilities of the Parent Company and the Operating Partnership are the same in their respective financial statements. The separate discussions of the Parent Company and the Operating Partnership in this report should be read in conjunction with each other to understand the results of the Company’s operations on a consolidated basis and how management operates the Company.

Management operates the Parent Company and the Operating Partnership as one enterprise. The management of the Parent Company consists of the same members as the management of the Operating Partnership. These members are officers of both the Parent Company and of the Operating Partnership.

The Company believes that combining the annual reports on Form 10-K of the Parent Company and the Operating Partnership into a single report will result in the following benefits:

 

facilitate a better understanding by the investors of the Parent Company and the Operating Partnership by enabling them to view the business as a whole in the same manner as management views and operates the business;

 

remove duplicative disclosures and provide a more straightforward presentation in light of the fact that a substantial portion of the disclosure applies to both the Parent Company and the Operating Partnership; and

 

create time and cost efficiencies through the preparation of one combined report instead of two separate reports.

There are few differences between the Parent Company and the Operating Partnership, which are reflected in the footnote disclosures in this report. The Company believes it is important to understand the differences between the Parent Company and the Operating Partnership in the context of how these entities operate as an interrelated consolidated company. The Parent Company is a REIT, whose only material asset is its ownership of the partnership interests of the Operating Partnership. As a result, the Parent Company does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public equity from time to time and guaranteeing the debt obligations of the Operating Partnership. The Operating Partnership holds substantially all the assets of the Company and directly or indirectly holds the ownership interests in the Company’s real estate ventures. The Operating Partnership conducts the operations of the Company’s business and is structured as a partnership with no publicly traded equity. Except for net proceeds from equity issuances by the Parent Company, which are contributed to the Operating Partnership in exchange for partnership units, the Operating Partnership generates the capital required by the Company’s business through the Operating Partnership’s operations, by the Operating Partnership’s direct or indirect incurrence of indebtedness or through the issuance of partnership units of the Operating Partnership or equity interests in subsidiaries of the Operating Partnership.

The equity and noncontrolling interests in the Parent Company and the Operating Partnership’s equity are the main areas of difference between the consolidated financial statements of the Parent Company and the Operating Partnership. The common units of limited partnership interest in the Operating Partnership are accounted for as partners’ equity in the Operating Partnership’s financial statements while the common units of limited partnership interests held by parties other than the Parent Company are presented as noncontrolling interests in the Parent Company’s financial statements. The differences between the Parent Company and the Operating Partnership’s equity relate to the differences in the equity issued at the Parent Company and Operating Partnership levels.

To help investors understand the significant differences between the Parent Company and the Operating Partnership, this report presents the following as separate notes or sections for each of the Parent Company and the Operating Partnership:

 

Consolidated Financial Statements;

 

Parent Company’s and Operating Partnership’s Equity

2


This report also includes separate Item 9A. (Controls and Procedures) disclosures and separate Exhibit 31 and 32 certifications for each of the Parent Company and the Operating Partnership in order to establish that the Chief Executive Officer and the Chief Financial Officer of each entity have made the requisite certifications and that the Parent Company and Operating Partnership are compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. § 1350.

In order to highlight the differences between the Parent Company and the Operating Partnership, the separate sections in this report for the Parent Company and the Operating Partnership specifically refer to the Parent Company and the Operating Partnership. In the sections that combine disclosures of the Parent Company and the Operating Partnership, this report refers to such disclosures as those of the Company. Although the Operating Partnership is generally the entity that directly or indirectly enters into contracts and real estate ventures and holds assets and debt, reference to the Company is appropriate because the business is one enterprise and the Parent Company operates the business through the Operating Partnership.

 

 

 

3


TABLE OF CONTENTS

 

 

Page

PART I

 

 

Item 1. Business

8

 

 

Item 1A. Risk Factors

19

 

 

Item 1B. Unresolved Staff Comments

32

 

 

Item 2. Properties

33

 

 

Item 3. Legal Proceedings

41

 

 

Item 4. Mine Safety Disclosures

42

 

 

PART II

 

 

Item 5. Market for Registrant’s Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities

42

 

 

Item 6. Selected Financial Data

44

 

 

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

45

 

 

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

69

 

 

Item 8. Financial Statements and Supplementary Data

70

 

 

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

70

 

 

Item 9A. Controls and Procedures

70

 

 

Item 9B. Other Information

71

 

 

PART III

 

 

Item 10. Directors, Executive Officers and Corporate Governance

72

 

 

Item 11. Executive Compensation

72

 

 

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters

72

 

 

Item 13. Certain Relationships and Related Transactions, and Director Independence

72

 

 

Item 14. Principal Accountant Fees and Services

72

 

 

PART IV

 

 

Item 15. Exhibits and Financial Statement Schedules

72

 

 

Item 16. Form 10-K Summary

79

 

 

SIGNATURES

80

4


 

Exhibit 3.2.19

 Exhibit 10.2

 Exhibit 21

 Exhibit 23.1

 Exhibit 23.2

 Exhibit 31.1

 Exhibit 31.2

 Exhibit 31.3

 Exhibit 31.4

 Exhibit 32.1

 Exhibit 32.2

 Exhibit 32.3

 Exhibit 32.4

 Exhibit 99.1

 EX-101.INS XBRL INSTANCE DOCUMENT

 EX-101.SCH XBRL TAXONOMY EXTENSION SCHEMA

 EX-101.CAL XBRL TAXONOMY EXTENSION CALCULATION LINKBASE

 EX-101.LAB XBRL TAXONOMY EXTENSION LABEL LINKBASE

 EX-101.PRE XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE

 EX-101.DEF XBRL TAXONOMY EXTENSION DEFINITION LINKBASE

 

 

 

5


Filing Format

This combined Form 10-K is being filed separately by Brandywine Realty Trust (the “Parent Company”) and Brandywine Operating Partnership, L.P. (the “Operating Partnership”).

Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. This report and other materials filed by us with the Securities and Exchange Commission (the “SEC”) (as well as information included in oral or other written statements made by us) contain statements that are forward-looking, including statements relating to business and real estate development activities, acquisitions, dispositions, future capital expenditures, financing sources, governmental regulation (including environmental regulation) and competition. We intend such forward-looking statements to be covered by the safe-harbor provisions of the 1995 Act. The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “will,” “should” and similar expressions, as they relate to us, are intended to identify forward-looking statements. Although we believe that the expectations reflected in such forward-looking statements are based on reasonable assumptions, we can give no assurance that our expectations will be achieved. These forward-looking statements are inherently uncertain, and actual results may differ from expectations. Our actual future results and trends may differ materially from expectations depending on a variety of factors discussed in our filings with the Securities and Exchange Commission (the “SEC”). These factors include without limitation:

 

The continuing impact of modest global economic growth, which is having and may continue to have a negative effect on, among other things, the following:

 

the fundamentals of our business, including overall market occupancy, demand for office space and rental rates;

 

the financial condition of our tenants, many of which are financial, legal and other professional firms, our lenders, counterparties to our derivative financial instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties;

 

the availability of financing on attractive terms or at all, which may adversely impact our future interest expense and our ability to pursue acquisition and development opportunities and refinance existing debt; and

 

real estate asset valuations, a decline in which may limit our ability to dispose of assets at attractive prices or obtain or maintain debt financing secured by our properties or on an unsecured basis.

 

changes in local real estate conditions (including changes in rental rates and the number of properties that compete with our properties);

 

our failure to lease unoccupied space in accordance with our projections;

 

our failure to re-lease occupied space upon expiration of leases;

 

tenant defaults and the bankruptcy of major tenants;

 

increases in interest rates;

 

failure of interest rate hedging contracts to perform as expected and the effectiveness of such arrangements;

 

failure of acquisitions, developments and other investments, including projects undertaken through joint ventures, to perform as expected;

 

unanticipated costs associated with the purchase, integration and operation of our acquisitions;

 

unanticipated costs to complete, lease-up and operate our developments and redevelopments;

 

unanticipated costs associated with land development, including building moratoriums and inability to obtain necessary zoning, land-use, building, occupancy and other required governmental approvals, construction cost increases or overruns and construction delays;

 

impairment charges;

 

increased costs for, or lack of availability of, adequate insurance, including for terrorist acts or environmental liabilities;

 

actual or threatened terrorist attacks;

 

cybersecurity attacks;

 

the impact on workplace and tenant space demands driven by technology, employee culture and commuting patterns;

 

demand for tenant services beyond those traditionally provided by landlords;

 

liability and clean-up costs incurred under environmental or other laws;

 

risks associated with our investments in real estate ventures and unconsolidated entities, including our lack of sole decision-making authority and our reliance on our venture partners’ financial condition;

 

inability of real estate venture partners to fund venture obligations or perform under our real estate venture development agreements;

 

failure to manage our growth effectively into new product types within our portfolio and real estate venture arrangements;

6


 

failure of dispositions to close in a timely manner;

 

the impact of earthquakes and other natural disasters;

 

the impact of climate change and compliance costs relating to laws and regulations governing climate change;

 

risks associated with federal, state and local tax audits;

 

complex regulations relating to our status as a real estate investment trust, or REIT, and the adverse consequences of our failure to qualify as a REIT; and

 

changes in accounting principles, or their application or interpretation, and our ability to make estimates and the assumptions underlying the estimates, which could have an effect on our earnings.

Given these uncertainties, and the other risks identified in the “Risk Factors” section and elsewhere in this report, we caution readers not to place undue reliance on forward-looking statements. We assume no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

 

 

7


PART I

Item 1.

Business

Introduction

We are a self-administered and self-managed REIT that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office, residential, retail and mixed-use properties. As of December 31, 2018, we owned 97 properties that contained an aggregate of approximately 16.8 million net rentable square feet (collectively, the “Properties”). Our core portfolio of operating properties, as of December 31, 2018, excludes one development property and three redevelopment properties under construction or committed for construction (collectively, the “Core Properties”). The Properties were comprised of the following as of December 31, 2018:

  

 

 

Number of Properties

 

 

Rentable Square Feet

 

 

Percentage Occupied

 

 

Percentage Leased

 

Office properties

 

 

 

88

 

 

 

15,609,156

 

 

 

 

 

 

 

 

 

Mixed-use properties

 

 

 

4

 

 

 

646,741

 

 

 

 

 

 

 

 

 

Retail property

 

 

 

1

 

 

 

17,884

 

 

 

 

 

 

 

 

 

Core Properties

 

 

 

93

 

 

 

16,273,781

 

 

93.3%

 

 

95