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Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2017
Real Estate Properties [Line Items] |
Schedule of Property Subject to or Available for Operating Lease | Boston Properties, Inc. Real estate consisted of the following at December 31, 2017 and December 31, 2016 (in thousands):
|  | 2017 |  | 2016
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 | )
|  | $ | 16,507,008 |  |  | $ | 15,925,028 |
_______________
(1) | Includes pre-development costs.
Boston Properties Limited Partnership Real estate consisted of the following at December 31, 2017 and December 31, 2016 (in thousands):
|  | 2017 |  | 2016
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 | )
|  | $ | 16,188,205 |  |  | $ | 15,597,508 |
_______________
(1) | Includes pre-development costs.
103 Carnegie Center [Member] |
Real Estate Properties [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 | )
MacArthur Station Residences |
Real Estate Properties [Line Items] |
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] |
Period from June 29, 2017 through December 31, 2017 | $ | 5 |
2018 | 10 |
2019 | 10 |
2020 | 10 |
2021 | 13 |
Thereafter | 38,778 |
Total expected minimum lease payments | 38,826 |
Interest portion | (9,864 | )
Present value of expected net minimum lease payments | $ | 28,962 |

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