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Real Estate Schedule of Real Estate Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Real Estate Properties [Line Items]    
Land $ 5,065,704 $ 5,069,206
Right-of-use assets - finance leases 237,845 237,393
Right of use assets - operating leases 170,085 [1] 146,406
Land held for future development [2] 568,034 450,954
Buildings and improvements 14,118,587 13,777,691
Tenant improvements 2,853,531 2,752,880
Furniture, Fixtures and Equipment 51,013 49,606
Construction in progress 1,054,531 868,773
Total 24,119,330 23,352,909
Less: accumulated depreciation (5,850,397) (5,534,102)
Total real estate 18,268,933 17,818,807
Boston Properties Limited Partnership    
Real Estate Properties [Line Items]    
Land 4,968,851 4,971,990
Right-of-use assets - finance leases 237,845 237,393
Right of use assets - operating leases 170,085 [1] 146,406
Land held for future development [2] 568,034 450,954
Buildings and improvements 13,839,945 13,498,098
Tenant improvements 2,853,531 2,752,880
Furniture, Fixtures and Equipment 51,013 49,606
Construction in progress 1,054,531 868,773
Total 23,743,835 22,976,100
Less: accumulated depreciation (5,739,625) (5,428,576)
Total real estate $ 18,004,210 $ 17,547,524
[1] See Note 4.
[2] Includes pre-development costs.