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Real Estate Real Estate Properties Table (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | $ 5,105,376 | $ 5,080,679
Land held for future development | [1] | 204,506 | 204,925
Buildings and improvements |  | 12,435,573 | 12,284,164
Tenant improvements |  | 2,266,796 | 2,219,608
Furniture, fixtures and equipment |  | 41,507 | 37,928
Construction in Progress |  | 1,262,886 | 1,269,338
Total |  | 21,316,644 | 21,096,642
Accumulated depreciation |  | (4,674,838) | (4,589,634)
Total real estate |  | 16,641,806 | 16,507,008
Boston Properties Limited Partnership |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land |  | 5,001,810 | 4,976,303
Land held for future development | [1] | 204,506 | 204,925
Buildings and improvements |  | 12,130,901 | 11,977,062
Tenant improvements |  | 2,266,796 | 2,219,608
Furniture, fixtures and equipment |  | 41,507 | 37,928
Construction in Progress |  | 1,262,886 | 1,269,338
Total |  | 20,908,406 | 20,685,164
Accumulated depreciation |  | (4,580,949) | (4,496,959)
Total real estate |  | $ 16,327,457 | $ 16,188,205
[1] | Includes pre-development costs.

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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://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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- 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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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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