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Real Estate Properties Table (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Real estate |  |  |  |
Land |  | $ 5,061,532 |  | $ 5,072,568
Right of use assets - finance leases |  | 187,292 |  | 0
Right of use assets - operating leases |  | 151,166 | $ 151,800 | 0
Land held for future development | [1] | 258,221 |  | 200,498
Buildings and improvements |  | 13,286,605 |  | 13,356,751
Tenant improvements |  | 2,444,358 |  | 2,396,932
Furniture, fixtures and equipment |  | 43,080 |  | 44,351
Construction in progress |  | 647,469 |  | 578,796
Total |  | 22,079,723 |  | 21,649,896
Accumulated depreciation |  | (4,962,959) |  | (4,897,777)
Total real estate |  | 17,116,764 |  | 16,752,119
Boston Properties Limited Partnership |  |  |  |
Real estate |  |  |  |
Land |  | 4,961,028 |  | 4,971,475
Right of use assets - finance leases |  | 187,292 |  | 0
Right of use assets - operating leases |  | 151,166 |  | 0
Land held for future development | [1] | 258,221 |  | 200,498
Buildings and improvements |  | 12,991,108 |  | 13,059,488
Tenant improvements |  | 2,444,358 |  | 2,396,932
Furniture, fixtures and equipment |  | 43,080 |  | 44,351
Construction in progress |  | 647,469 |  | 578,796
Total |  | 21,683,722 |  | 21,251,540
Accumulated depreciation |  | (4,864,334) |  | (4,800,475)
Total real estate |  | $ 16,819,388 |  | $ 16,451,065
[1] | Includes pre-development costs.

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