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Real Estate Schedule of Real Estate Properties (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Real Estate Properties [Line Items]    
Land $ 5,070,126 $ 5,111,606
Right-of-use assets - finance leases 237,394 237,394
Right of use assets - operating leases 147,512 148,640
Land held for future development [1] 414,053 254,828
Buildings and improvements 13,488,860 13,646,054
Tenant improvements 2,664,294 2,656,439
Furniture, Fixtures and Equipment 44,635 44,313
Construction in progress 893,935 789,736
Total 22,960,809 22,889,010
Less: accumulated depreciation (5,292,389) (5,266,798)
Total real estate 17,668,420 17,622,212
Boston Properties Limited Partnership    
Real Estate Properties [Line Items]    
Land 4,972,910 5,011,153
Right-of-use assets - finance leases 237,394 237,394
Right of use assets - operating leases 147,512 148,640
Land held for future development [1] 414,053 254,828
Buildings and improvements 13,209,267 13,351,286
Tenant improvements 2,664,294 2,656,439
Furniture, Fixtures and Equipment 44,635 44,313
Construction in progress 893,935 789,736
Total 22,584,000 22,493,789
Less: accumulated depreciation (5,190,360) (5,162,908)
Total real estate $ 17,393,640 $ 17,330,881
[1] Includes pre-development costs.