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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
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