XML 49 R34.htm IDEA: XBRL DOCUMENT
v3.25.3

Organization (Details) ft² in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 ft² Real_Estate_Properties yr shares | Dec. 31, 2024 | Sep. 30, 2025 ft² Real_Estate_Properties yr shares
Real Estate Properties [Line Items] |  |  |
Restriction on redemption of OP units from date of issuance (years) | yr | 1 |  | 1
One OP unit is equivalent to one share of Common Stock (in shares) | shares | 1 |  | 1
OP unit conversion rate (in shares) | shares | 1 |  | 1
LTIP Unit Conversion Rate | shares | 1 |  | 1
2012 OPP Units and Vested MYLTIPs |  |  |
Real Estate Properties [Line Items] |  |  |
Vesting Period |  |  | 3 years
Construction in Progress |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 8 |  | 8
Net Rentable Area (in sf) | ft² | 3.5 |  | 3.5
Commercial Real Estate Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 187 |  | 187
Net Rentable Area (in sf) | ft² | 54.6 |  | 54.6
Office and Life Sciences Building [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 163 |  | 163
Office and Life Sciences Building [Member] | Construction in Progress |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 4 |  | 4
Retail Site [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 14 |  | 14
Retail Site [Member] | Construction in Progress |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 1 |  | 1
Residential Building |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 9 |  | 9
Residential Building | Construction in Progress |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 3 |  | 3
Hotel [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties | 1 |  | 1
Boston Properties Limited Partnership |  |  |
Real Estate Properties [Line Items] |  |  |
General and limited partnership interest in the operating partnership (percent) | 89.60% | 89.70% |

X
- Definition Common Stock Conversion Rate + References No definition available. + Details
Name: | bxp_CommonStockConversionRate
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition LTIP Unit Conversion Rate + References No definition available. + Details
Name: | bxp_LTIPUnitConversionRate
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition OP Unit Conversion Rate. + References No definition available. + Details
Name: | bxp_OpUnitConversionRate
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Restriction On Redemption Of OP Units From Date Of Issuance In Years + References No definition available. + Details
Name: | bxp_RestrictionOnRedemptionOfOpUnitsFromDateOfIssuanceInYears
Namespace Prefix: | bxp_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-3 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
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: | dtr-types:areaItemType
Balance Type: | na
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
- 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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=bxp_A2012OPPUnitsAndVestedMYLTIPsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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