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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.

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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