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Real Estate Properties Table (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Real estate      
Document Period End Date Jun. 30, 2019    
Land $ 5,056,046   $ 5,072,568
Right of use assets - finance leases 187,269   0
Right of use assets - operating leases 149,839 $ 151,800 0
Land held for future development [1] 272,332   200,498
Buildings and improvements 13,271,691   13,356,751
Tenant improvements 2,486,269   2,396,932
Furniture, fixtures and equipment 44,462   44,351
Construction in progress 812,408   578,796
Total 22,280,316   21,649,896
Accumulated depreciation (5,050,606)   (4,897,777)
Total real estate $ 17,229,710   16,752,119
Boston Properties Limited Partnership      
Real estate      
Document Period End Date Jun. 30, 2019    
Land $ 4,955,593   4,971,475
Right of use assets - finance leases 187,269   0
Right of use assets - operating leases 149,839   0
Land held for future development [1] 272,332   200,498
Buildings and improvements 12,976,345   13,059,488
Tenant improvements 2,486,269   2,396,932
Furniture, fixtures and equipment 44,462   44,351
Construction in progress 812,408   578,796
Total 21,884,517   21,251,540
Accumulated depreciation (4,949,822)   (4,800,475)
Total real estate $ 16,934,695   $ 16,451,065
[1]
Includes pre-development costs.