XML 107 R80.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Commitments And Contingencies (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) ft² Real_Estate_Properties | Oct. 02, 2023 USD ($) | Sep. 13, 2023 USD ($) | Dec. 31, 2022 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Letter of credit and performance obligations | $ 21,600 |  |  |
Note receivable, net | 1,714 |  |  | $ 0
Property insurance program per occurrence limits | 1,000,000 |  |  |
Per occurrence limit for NBCR Coverage | 1,000,000 |  |  |
Value of program trigger | $ 200,000 |  |  |
Coinsurance of program trigger | 20.00% |  |  |
Program trigger deductible | 20.00% |  |  |
Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions | $ 330,000 |  |  |
Annual aggregate limit of the earthquake insurance which covers San Francisco and Los Angeles regions | 330,000 |  |  |
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles | $ 30,000 |  |  |
Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles | 5.00% |  |  |
Per Occurrence Limit of Earthquake Insurance Seattle | $ 110,000 |  |  |
Annual Aggregate Limit of Earthquake Insurance Seattle | $ 110,000 |  |  |
Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle | 2.00% |  |  |
Accrued Liabilities | $ 1,500 |  |  |
Loss Contingency, Portion Not Accrued | 31,000 |  |  |
Boston Properties Limited Partnership |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Note receivable, net | 1,714 |  |  | $ 0
Operating partnership guarantee to cover liabilities of IXP | 20,000 |  |  |
767 Venture, LLC [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Maximum funding obligation | 8,500 |  |  |
Property insurance program per occurrence limits | 1,625,000 |  |  |
601 Lexington Avenue |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP | 1,350,000 |  |  |
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism | 750,000 |  |  |
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism | 600,000 |  |  |
Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism | 1,750,000 |  |  |
Metropolitan Square | Affiliated Entity |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Note receivable, net | $ 1,700 |  |  |
Metropolitan Square | Subordinated Debt |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 12.00% |
Metropolitan Square | Scenario, Plan |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  | $ 100,000 |
Metropolitan Square | Scenario, Plan | Affiliated Entity |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Loans and Leases Receivable, Loans in Process |  |  | $ 20,000 |
Metropolitan Square | Scenario, Plan | Subordinated Debt | Affiliated Entity |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percent of Total |  | 20.00% |  |
Loans and Leases Receivable, Loans in Process |  | $ 20,000 |  |
Residential Properties [Member] | Scenario, Plan |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Net Rentable Area (in sf) | ft² | 400,000 |  |  |
Office and Life Sciences Building [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Number of real estate properties | Real_Estate_Properties | 167 |  |  |
Office and Life Sciences Building [Member] | Scenario, Plan |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Net Rentable Area (in sf) | ft² | 1,100,000 |  |  |
Number of real estate properties | 2 |  |  |

X
- Definition Amount Of Earthquake Insurance Provided By IXP LLC As Direct Insurer San Francisco and Los Angeles + References No definition available. + Details
Name: | bxp_AmountOfEarthquakeInsuranceProvidedByIXPLLCAsDirectInsurerSanFranciscoandLosAngeles
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Annual Aggregate Limit Of Earth Quake Insurance San Francisco and Los Angeles + References No definition available. + Details
Name: | bxp_AnnualAggregateLimitOfEarthQuakeInsuranceSanFranciscoandLosAngeles
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Annual Aggregate Limit of Earthquake Insurance Seattle + References No definition available. + Details
Name: | bxp_AnnualAggregateLimitOfEarthquakeInsuranceSeattle
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
Name: | bxp_CommitmentsAndContingenciesLineItems
Namespace Prefix: | bxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism + References No definition available. + Details
Name: | bxp_CoverageForActsOfTerrorismUnderTRIACoveredInExcessOfAmountCoveredByIXPPropertyAndTerrorism
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism + References No definition available. + Details
Name: | bxp_CoverageForActsOfTerrorismUnderTRIACoveredInExcessOfAmountCoveredByIXPTerrorism
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP + References No definition available. + Details
Name: | bxp_CoverageForActsOfTerrorismUnderTriaCoveredInExcessOfAmountCoveredByIxp
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Earthquake Deductible Insurance Percentage Of Value Of The Affected Property San Francisco and Los Angeles + References No definition available. + Details
Name: | bxp_EarthquakeDeductibleInsurancePercentageOfValueOfTheAffectedPropertySanFranciscoandLosAngeles
Namespace Prefix: | bxp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle + References No definition available. + Details
Name: | bxp_EarthquakeDeductibleInsurancePercentageOfValueOfTheAffectedPropertySeattle
Namespace Prefix: | bxp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Insurance Policy Limit + References No definition available. + Details
Name: | bxp_InsurancePolicyLimit
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letter Of Credit And Performance Obligation + References No definition available. + Details
Name: | bxp_LetterOfCreditAndPerformanceObligation
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating partnership guarantee to cover liabilities of subsidiary + References No definition available. + Details
Name: | bxp_OperatingPartnershipGuaranteeToCoverLiabilitiesOfSubsidiary
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Per occurrence limit for NBCR Coverage + References No definition available. + Details
Name: | bxp_PerOccurrenceLimitForNbcrCoverage
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Per Occurrence Limit Of Earth Quake Insurance San Francisco and Los Angeles + References No definition available. + Details
Name: | bxp_PerOccurrenceLimitOfEarthQuakeInsuranceSanFranciscoandLosAngeles
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Per Occurrence Limit of Earthquake Insurance Seattle + References No definition available. + Details
Name: | bxp_PerOccurrenceLimitOfEarthquakeInsuranceSeattle
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percent of Total + References No definition available. + Details
Name: | bxp_PercentOfTotal
Namespace Prefix: | bxp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Program Trigger Coinsurance + References No definition available. + Details
Name: | bxp_ProgramTriggerCoinsurance
Namespace Prefix: | bxp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Program Trigger Value + References No definition available. + Details
Name: | bxp_ProgramTriggerValue
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Program trigger deductible + References No definition available. + Details
Name: | bxp_Programtriggerdeductible
Namespace Prefix: | bxp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism + References No definition available. + Details
Name: | bxp_SumOfCoverageCoveredByIXPAndExcessCoverageForPropertyAndTerrorism
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableLoansInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-9 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-80 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) -Publisher SEC Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=bxp_BostonPropertiesLimitedPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_SixZeroOneLexingtonAvenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_MetropolitanSquareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_ResidentialRealEstateMember
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: |