XML 89 R67.htm IDEA: XBRL DOCUMENT
v3.20.4

REAL ESTATE INVESTMENTS - Summary of Office Properties Sold (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2020 USD ($) ft² property | Jul. 21, 2020 USD ($) ft² property | Jun. 15, 2020 USD ($) a | Mar. 19, 2020 USD ($) ft² | Sep. 11, 2019 USD ($) ft² | Mar. 15, 2019 USD ($) a | Dec. 21, 2018 USD ($) ft² | Dec. 20, 2018 USD ($) ft² | Jun. 21, 2018 USD ($) ft² | Mar. 16, 2018 USD ($) a | Jan. 10, 2018 USD ($) a | Sep. 30, 2020 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 289,461 | $ 356 | $ 2,932
Sale of ownership interest percentage | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-Atlantic Office Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration | $ 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-Atlantic Office Portfolio | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration holdback term | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-Atlantic Office Portfolio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration holdback term | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commerce Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of ownership interest percentage |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of assets disposed of |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deconsolidation gain |  |  |  |  |  |  |  |  |  |  |  | $ 271,900 |  |  |  |
Subaru National Training Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct finance lease, interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600 |  |  |
Office Properties | Mid-Atlantic Office JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² | 1,128,645 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price | $ 192,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Mid-Atlantic Office Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² | 1,128,645 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price | $ 192,943 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale | $ 15,164 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Mid-Atlantic Office Portfolio | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Mid-Atlantic Office Portfolio | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Commerce Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  | 1,896,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  | $ 271,905 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 52 Swedesford Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  | 131,077 |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  | $ 2,336 |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 1900 Gallows Rd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  | 210,632 |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  | $ 36,400 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  | $ (367) |  |  |  |  |  |  |  |  |  |  |
Office Properties | Rockpoint Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  | 1,293,197 |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  | $ 312,000 |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  | $ 397 |  |  |  |  |  |  |  |
Office Properties | 20 East Clementon Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  | 38,260 |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  | $ (35) |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Land | Keith Valley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  | 14.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  | $ 201 |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 9 Presidential Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  | 2.7 |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  | $ 5,325 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  | $ 751 |  |  |  |  |  |  |  |  |  |
Land | Garza Ranch Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  | 6.6 |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  | $ 14,571 |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  |  | $ 1,515 |  |  |  |  |  |
Land | Westpark Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  |  | 13.1 |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  | $ 485 |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  |  |  | $ 22 |  |  |  |  |
Land | Garza Ranch - Multi-family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000
Mixed-use properties | Subaru National Training Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  | 83,000 |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  | $ 45,300 |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  | $ 2,570 |  |  |  |  |  |  |  |  |

X
- Definition Disposal Group, Contingent Consideration, Asset, Holdback Term + References No definition available. + Details
Name: | bdn_DisposalGroupContingentConsiderationAssetHoldbackTerm
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disposal Group, Including Discontinued Operation, Value Of Assets Disposed Of + References No definition available. + Details
Name: | bdn_DisposalGroupIncludingDiscontinuedOperationValueOfAssetsDisposedOf
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disposal Group, Not Discontinued Operation, Contingent Consideration, Asset + References No definition available. + Details
Name: | bdn_DisposalGroupNotDiscontinuedOperationContingentConsiderationAsset
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties sold during the period. + References No definition available. + Details
Name: | bdn_NumberOfRealEstatePropertiesSold
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale of ownership interest percentage. + References No definition available. + Details
Name: | bdn_SaleOfOwnershipInterestPercentage
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
Name: | us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest income from net investment in direct financing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121640914&loc=SL77927221-108306 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 + Details
Name: | us-gaap_DirectFinancingLeaseInterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_MidAtlanticOfficePortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_OneandTwoCommerceSquareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_SubaruNationalTrainingCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_MidAtlanticOfficeVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_PA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_A52SwedesfordSquareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_A1900GallowsRd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_RockpointPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_A20EastClementonRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_KeithValleyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_NinePresidentialBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_GarzaRanchOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_WestparkLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_GarzaRanchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=bdn_MixedUsePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |