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Real Estate Schedule of Real Estate Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Real Estate Properties [Line Items]      
Land $ 5,111,606   $ 5,072,568
Right-of-use assets - finance leases 237,394    
Right of use assets - operating leases 148,640 $ 151,800  
Land held for future development [1] 254,828   200,498
Buildings and improvements 13,646,054   13,356,751
Tenant improvements 2,656,439   2,396,932
Furniture, Fixtures and Equipment 44,313   44,351
Construction in progress 789,736   578,796
Total 22,889,010   21,649,896
Less: accumulated depreciation (5,266,798)   (4,897,777)
Total real estate 17,622,212   16,752,119
Boston Properties Limited Partnership      
Real Estate Properties [Line Items]      
Land 5,011,153   4,971,475
Right-of-use assets - finance leases 237,394    
Right of use assets - operating leases 148,640    
Land held for future development [1] 254,828   200,498
Buildings and improvements 13,351,286   13,059,488
Tenant improvements 2,656,439   2,396,932
Furniture, Fixtures and Equipment 44,313   44,351
Construction in progress 789,736   578,796
Total 22,493,789   21,251,540
Less: accumulated depreciation (5,162,908)   (4,800,475)
Total real estate $ 17,330,881   $ 16,451,065
[1]
Includes pre-development costs.