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Commitments And Contingencies (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2023 USD ($) ft² Real_Estate_Properties
Commitments And Contingencies [Line Items] |
Letter of credit and performance obligations | $ 21,600
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%
Boston Properties Limited Partnership |
Commitments And Contingencies [Line Items] |
Operating partnership guarantee to cover liabilities of IXP | $ 20,000
767 Venture, LLC [Member] |
Commitments And Contingencies [Line Items] |
Maximum funding obligation | 10,000
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
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 | 169
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
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Period Type: | duration

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

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- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | bxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism + References No definition available. + Details
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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
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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
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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
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Namespace Prefix: | bxp_
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Balance Type: | na
Period Type: | duration

X
- Definition Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle + References No definition available. + Details
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- Definition Insurance Policy Limit + References No definition available. + Details
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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
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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 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
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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
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Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

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

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