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Real Estate Real Estate (Tables) | 9 Months Ended
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Sep. 30, 2017
Entity Information [Line Items] |
Schedule of Real Estate Properties [Table Text Block] | Boston Properties, Inc. Real estate consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):
| September 30, 2017 |  | December 31, 2016
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 |
Less: Accumulated depreciation | (4,484,798 | ) |  | (4,222,235 | )
| $ | 16,374,447 |  |  | $ | 15,925,028 |
_______________
(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, 2017 and December 31, 2016 (in thousands):
| September 30, 2017 |  | December 31, 2016
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 |
Less: Accumulated depreciation | (4,394,077 | ) |  | (4,136,364 | )
| $ | 16,053,690 |  |  | $ | 15,597,508 |
_______________
(1) | Includes pre-development costs.
MacArthur Transit Center [Member] |
Entity Information [Line Items] |
Capital Leases in Financial Statements of Lessee Disclosure [Text Block] | As of June 29, 2017, future minimum lease payments related to this capital lease are as follows (in thousands):
Period from June 29, 2017 through December 31, 2017 | $ | 5 |
2018 | 10 |
2019 | 10 |
2020 | 10 |
2021 | 13 |
Thereafter | 38,778 |
Total expected minimum obligations | 38,826 |
Interest portion | (9,864 | )
Present value of net expected minimum payments | $ | 28,962 |
103 Carnegie Center [Member] |
Entity Information [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following table summarizes the allocation of the aggregate purchase price, including transaction costs, of 103 Carnegie Center at the date of acquisition (in thousands).
Land | $ | 2,890 |
Building and improvements | 11,229 |
Tenant improvements | 871 |
In-place lease intangibles | 2,389 |
Below-market lease intangible | (1,426 | )
Net assets acquired | $ | 15,953 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] | The following table summarizes the estimated annual amortization of the acquired below-market lease intangibles and the acquired in-place lease intangibles for 103 Carnegie Center for the remainder of 2017 and each of the next four succeeding fiscal years (in thousands).
| Acquired In-Place Lease Intangibles |  | Acquired Below- Market Lease Intangibles
Period from May 15, 2017 through December 31, 2017 | $ | 660 |  |  | $ | (248 | )
2018 | 590 |  |  | (363 | )
2019 | 367 |  |  | (337 | )
2020 | 243 |  |  | (308 | )
2021 | 96 |  |  | (105 | )

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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=6454179&loc=d3e41551-112718 + Details
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