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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | $ 25,744,214 | $ 24,108,220 | $ 23,303,303
Additions to / improvements of real estate | 1,811,036 | 2,228,000 | 1,145,084
Assets sold/written-off | (133,779) | (592,006) | (340,167)
Balance at the end of the year | 27,421,471 | 25,744,214 | 24,108,220
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 6,260,992 | 5,848,183 | 5,501,637
Depreciation expense | 714,191 | 646,020 | 623,854
Assets sold/written-off | (133,779) | (233,211) | (277,308)
Balance at the end of the year | 6,841,404 | 6,260,992 | 5,848,183
Boston Properties Limited Partnership |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | 25,376,700 | 23,734,833 | 22,926,494
Additions to / improvements of real estate | 1,811,036 | 2,228,000 | 1,145,084
Assets sold/written-off | (132,530) | (586,133) | (336,745)
Balance at the end of the year | 27,055,206 | 25,376,700 | 23,734,833
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 6,143,384 | 5,736,240 | 5,396,111
Depreciation expense | 707,183 | 638,538 | 615,553
Assets sold/written-off | (132,530) | (231,394) | (275,424)
Balance at the end of the year | $ 6,718,037 | $ 6,143,384 | $ 5,736,240

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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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