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Real Estate Real Estate (Tables) | 6 Months Ended
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Jun. 30, 2017
Entity Information [Line Items] |
Schedule of Real Estate Properties [Table Text Block] | Boston Properties, Inc. Real estate consisted of the following at June 30, 2017 and December 31, 2016 (in thousands):
| June 30, 2017 |  | December 31, 2016
Land | $ | 4,880,337 |  |  | $ | 4,879,020 |
Land held for future development (1) | 250,451 |  |  | 246,656 |
Buildings and improvements | 11,960,865 |  |  | 11,890,626 |
Tenant improvements | 2,136,739 |  |  | 2,060,315 |
Furniture, fixtures and equipment | 37,136 |  |  | 32,687 |
Construction in progress | 1,348,838 |  |  | 1,037,959 |
Total | 20,614,366 |  |  | 20,147,263 |
Less: Accumulated depreciation | (4,379,446 | ) |  | (4,222,235 | )
| $ | 16,234,920 |  |  | $ | 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 June 30, 2017 and December 31, 2016 (in thousands):
| June 30, 2017 |  | December 31, 2016
Land | $ | 4,775,961 |  |  | $ | 4,774,460 |
Land held for future development (1) | 250,451 |  |  | 246,656 |
Buildings and improvements | 11,653,196 |  |  | 11,581,795 |
Tenant improvements | 2,136,739 |  |  | 2,060,315 |
Furniture, fixtures and equipment | 37,136 |  |  | 32,687 |
Construction in progress | 1,348,838 |  |  | 1,037,959 |
Total | 20,202,321 |  |  | 19,733,872 |
Less: Accumulated depreciation | (4,290,112 | ) |  | (4,136,364 | )
| $ | 15,912,209 |  |  | $ | 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] |
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] |
| 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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