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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | $ 28,521,176 | $ 27,421,471 | $ 25,744,214
Additions to / improvements of real estate | 1,225,473 | 1,210,558 | 1,811,036
Assets sold/written-off | (860,619) | (110,853) | (133,779)
Balance at the end of the year | 28,886,030 | 28,521,176 | 27,421,471
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 7,485,502 | 6,841,404 | 6,260,992
Depreciation expense | 795,670 | 754,951 | 714,191
Assets sold/written-off | (277,758) | (110,853) | (133,779)
Balance at the end of the year | 8,003,414 | 7,485,502 | 6,841,404
Boston Properties Limited Partnership |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |
Balance at the beginning of the year | 28,154,911 | 27,055,206 | 25,376,700
Additions to / improvements of real estate | 1,225,473 | 1,210,558 | 1,811,036
Assets sold/written-off | (851,836) | (110,853) | (132,530)
Balance at the end of the year | 28,528,548 | 28,154,911 | 27,055,206
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of the year | 7,355,327 | 6,718,037 | 6,143,384
Depreciation expense | 788,884 | 748,143 | 707,183
Assets sold/written-off | (274,479) | (110,853) | (132,530)
Balance at the end of the year | $ 7,869,732 | $ 7,355,327 | $ 6,718,037

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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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