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Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land |  | $ 5,080,679 | $ 4,879,020
Land held for future development | [1] | 204,925 | 246,656
Buildings and improvements |  | 12,284,164 | 11,890,626
Tenant improvements |  | 2,219,608 | 2,060,315
Furniture, fixtures and equipment |  | 37,928 | 32,687
Construction in progress |  | 1,269,338 | 1,037,959
Total |  | 21,096,642 | 20,147,263
Less: accumulated depreciation |  | (4,589,634) | (4,222,235)
Total real estate |  | 16,507,008 | 15,925,028
Boston Properties Limited Partnership |  |  |
Real Estate Properties [Line Items] |  |  |
Land |  | 4,976,303 | 4,774,460
Land held for future development | [1] | 204,925 | 246,656
Buildings and improvements |  | 11,977,062 | 11,581,795
Tenant improvements |  | 2,219,608 | 2,060,315
Furniture, fixtures and equipment |  | 37,928 | 32,687
Construction in progress |  | 1,269,338 | 1,037,959
Total |  | 20,685,164 | 19,733,872
Less: accumulated depreciation |  | (4,496,959) | (4,136,364)
Total real estate |  | $ 16,188,205 | $ 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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