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v3.20.4

Future Minimum Lease Payments for Capital Leases (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Leases [Abstract] |
Lessee purchase option reasonably certain of exercising | $ 38,700

X
- Definition Lessee purchase option reasonably certain of exercising + References No definition available. + Details
Name: | bxp_LesseePurchaseOptionReasonablyCertainOfExercising
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration