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Real Estate Schedule of Real Estate Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Real Estate Properties [Line Items]    
Land $ 5,069,206 $ 5,111,606
Right-of-use assets - finance leases 237,393 237,394
Right of use assets - operating leases 146,406 148,640
Land held for future development [1] 450,954 254,828
Buildings and improvements 13,777,691 13,646,054
Tenant improvements 2,752,880 2,656,439
Furniture, Fixtures and Equipment 49,606 44,313
Construction in progress 868,773 789,736
Total 23,352,909 22,889,010
Less: accumulated depreciation (5,534,102) (5,266,798)
Total real estate 17,818,807 17,622,212
Boston Properties Limited Partnership    
Real Estate Properties [Line Items]    
Land 4,971,990 5,011,153
Right-of-use assets - finance leases 237,393 237,394
Right of use assets - operating leases 146,406 148,640
Land held for future development [1] 450,954 254,828
Buildings and improvements 13,498,098 13,351,286
Tenant improvements 2,752,880 2,656,439
Furniture, Fixtures and Equipment 49,606 44,313
Construction in progress 868,773 789,736
Total 22,976,100 22,493,789
Less: accumulated depreciation (5,428,576) (5,162,908)
Total real estate $ 17,547,524 $ 17,330,881
[1] Includes pre-development costs.