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Real Estate Properties Table (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Real estate |  |  |  |
Land |  | $ 5,087,029 |  | $ 5,072,568
Right of use assets - finance leases |  | 237,394 |  |
Right of use assets - operating leases |  | 149,231 | $ 151,800 |
Land held for future development | [1] | 246,972 |  | 200,498
Buildings and improvements |  | 13,396,648 |  | 13,356,751
Tenant improvements |  | 2,559,907 |  | 2,396,932
Furniture, fixtures and equipment |  | 44,908 |  | 44,351
Construction in progress |  | 953,336 |  | 578,796
Total |  | 22,675,425 |  | 21,649,896
Accumulated depreciation |  | (5,164,353) |  | (4,897,777)
Total real estate |  | 17,511,072 |  | 16,752,119
Boston Properties Limited Partnership |  |  |  |
Real estate |  |  |  |
Land |  | 4,986,576 |  | 4,971,475
Right of use assets - finance leases |  | 237,394 |  |
Right of use assets - operating leases |  | 149,231 |  |
Land held for future development | [1] | 246,972 |  | 200,498
Buildings and improvements |  | 13,101,302 |  | 13,059,488
Tenant improvements |  | 2,559,907 |  | 2,396,932
Furniture, fixtures and equipment |  | 44,908 |  | 44,351
Construction in progress |  | 953,336 |  | 578,796
Total |  | 22,279,626 |  | 21,251,540
Accumulated depreciation |  | (5,061,727) |  | (4,800,475)
Total real estate |  | $ 17,217,899 |  | $ 16,451,065
[1] | Includes pre-development costs.

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