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v3.22.2.2

Organization (Details) ft² in Millions |  | 9 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2022 ft² Real_Estate_Properties yr shares
Real Estate Properties [Line Items] |  |
Restriction on redemption of OP units from date of issuance (years) | yr |  | 1
One OP unit is equivalent to one share of Common Stock (in shares) | shares |  | 1
OP unit conversion rate (in shares) | shares |  | 1
Construction in Progress |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 14
Net Rentable Area (in sf) | ft² |  | 4.4
Commercial Real Estate Properties [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 193
Net Rentable Area (in sf) | ft² |  | 53.5
Office Building [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 173
Office Building [Member] | Construction in Progress |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 12
Retail Site [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 12
Retail Site [Member] | Construction in Progress |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 1
Residential Building |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 7
Residential Building | Construction in Progress |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 1
Hotel [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties |  | 1
Boston Properties Limited Partnership |  |
Real Estate Properties [Line Items] |  |
General and limited partnership interest in the operating partnership (percent) | 89.70% | 89.60%

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

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

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- Definition Restriction On Redemption Of OP Units From Date Of Issuance In Years + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |