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Real Estate Properties Table (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | $ 5,108,491 | $ 5,080,679
Land held for future development | [1] | 205,096 | 204,925
Buildings and improvements |  | 12,949,543 | 12,284,164
Tenant improvements |  | 2,322,552 | 2,219,608
Furniture, fixtures and equipment |  | 44,696 | 37,928
Construction in progress |  | 1,057,261 | 1,269,338
Total |  | 21,687,639 | 21,096,642
Accumulated depreciation |  | (4,838,496) | (4,589,634)
Total real estate |  | 16,849,143 | 16,507,008
Boston Properties Limited Partnership |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | 5,005,507 | 4,976,303
Land held for future development | [1] | 205,096 | 204,925
Buildings and improvements |  | 12,646,614 | 11,977,062
Tenant improvements |  | 2,322,552 | 2,219,608
Furniture, fixtures and equipment |  | 44,696 | 37,928
Construction in progress |  | 1,057,261 | 1,269,338
Total |  | 21,281,726 | 20,685,164
Accumulated depreciation |  | (4,741,280) | (4,496,959)
Total real estate |  | $ 16,540,446 | $ 16,188,205
[1] | Includes pre-development costs.

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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://www.xbrl.org/2003/role/presentationRef -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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