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Real Estate Real Estate Properties Table (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | $ 4,880,331 | $ 4,879,020
Land held for future development | [1] | 212,585 | 246,656
Buildings and improvements |  | 12,155,126 | 11,890,626
Tenant improvements |  | 2,186,953 | 2,060,315
Furniture, fixtures and equipment |  | 37,612 | 32,687
Construction in Progress |  | 1,386,638 | 1,037,959
Total |  | 20,859,245 | 20,147,263
Accumulated depreciation |  | (4,484,798) | (4,222,235)
Total real estate |  | 16,374,447 | 15,925,028
Boston Properties Limited Partnership |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | 4,775,955 | 4,774,460
Land held for future development | [1] | 212,585 | 246,656
Buildings and improvements |  | 11,848,024 | 11,581,795
Tenant improvements |  | 2,186,953 | 2,060,315
Furniture, fixtures and equipment |  | 37,612 | 32,687
Construction in Progress |  | 1,386,638 | 1,037,959
Total |  | 20,447,767 | 19,733,872
Accumulated depreciation |  | (4,394,077) | (4,136,364)
Total real estate |  | $ 16,053,690 | $ 15,597,508
[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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