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Real Estate (Tables) | 9 Months Ended
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Sep. 30, 2018
Entity Information [Line Items] |
Schedule of Real Estate Properties [Table Text Block] | Boston Properties, Inc. Real estate consisted of the following at September 30, 2018 and December 31, 2017 (in thousands):
| September 30, 2018 |  | December 31, 2017
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 |
Less: Accumulated depreciation | (4,838,496 | ) |  | (4,589,634 | )
| $ | 16,849,143 |  |  | $ | 16,507,008 |
_______________
(1) | Includes pre-development costs.
Boston Properties Limited Partnership |
Entity Information [Line Items] |
Schedule of Real Estate Properties [Table Text Block] | Boston Properties Limited Partnership Real estate consisted of the following at September 30, 2018 and December 31, 2017 (in thousands):
| September 30, 2018 |  | December 31, 2017
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 |
Less: Accumulated depreciation | (4,741,280 | ) |  | (4,496,959 | )
| $ | 16,540,446 |  |  | $ | 16,188,205 |
_______________
(1) | Includes pre-development costs.

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- Definition Tabular disclosure of lessor's property under leasing agreements and property available for lease (not currently under lease) by property class, the gross amount, accumulated depreciation and net amount of as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
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