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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation Roll Forward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | $ 23,303,303 | $ 22,844,697 | $ 21,605,545
Additions to / improvements of real estate | 1,145,084 | 996,989 | 1,671,898
Assets sold/written-off | (340,167) | (538,383) | (432,746)
Balance at the end of the year | 24,108,220 | 23,303,303 | 22,844,697
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 5,501,637 | 5,239,179 | 4,871,102
Depreciation expense | 623,854 | 573,898 | 564,938
Assets sold/written-off | (277,308) | (311,440) | (196,861)
Balance at the end of the year | 5,848,183 | 5,501,637 | 5,239,179
Boston Properties Limited Partnership |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | 22,926,494 | 22,449,476 | 21,207,189
Additions to / improvements of real estate | 1,145,084 | 996,989 | 1,671,898
Assets sold/written-off | (336,745) | (519,971) | (429,611)
Balance at the end of the year | 23,734,833 | 22,926,494 | 22,449,476
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 5,396,111 | 5,135,289 | 4,773,800
Depreciation expense | 615,553 | 566,813 | 557,130
Assets sold/written-off | (275,424) | (305,991) | (195,641)
Balance at the end of the year | $ 5,736,240 | $ 5,396,111 | $ 5,135,289

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- Definition Real Estate Accumulated Depreciation Excluding Furniture Fixtures and Equipment + References No definition available. + Details
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- Definition Real Estate Gross At Carrying Value Excluding Furniture Fixtures and Equipment + References No definition available. + Details
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- Definition SEC ScheduleIII Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures and Equipment + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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