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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | $ 24,108,220 | $ 23,303,303 | $ 22,844,697
Additions to / improvements of real estate | 2,228,000 | 1,145,084 | 996,989
Assets sold/written-off | (592,006) | (340,167) | (538,383)
Balance at the end of the year | 25,744,214 | 24,108,220 | 23,303,303
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 5,848,183 | 5,501,637 | 5,239,179
Depreciation expense | 646,020 | 623,854 | 573,898
Assets sold/written-off | (233,211) | (277,308) | (311,440)
Balance at the end of the year | 6,260,992 | 5,848,183 | 5,501,637
Boston Properties Limited Partnership |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | 23,734,833 | 22,926,494 | 22,449,476
Additions to / improvements of real estate | 2,228,000 | 1,145,084 | 996,989
Assets sold/written-off | (586,133) | (336,745) | (519,971)
Balance at the end of the year | 25,376,700 | 23,734,833 | 22,926,494
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 5,736,240 | 5,396,111 | 5,135,289
Depreciation expense | 638,538 | 615,553 | 566,813
Assets sold/written-off | (231,394) | (275,424) | (305,991)
Balance at the end of the year | $ 6,143,384 | $ 5,736,240 | $ 5,396,111

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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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- Details
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