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Real Estate (Tables) | 6 Months Ended
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Jun. 30, 2019
Entity Information [Line Items] |
Schedule of Real Estate Properties [Table Text Block] | Boston Properties, Inc. Real estate consisted of the following at June 30, 2019 and December 31, 2018 (in thousands):
| June 30, 2019 |  | December 31, 2018
Land | $ | 5,056,046 |  |  | $ | 5,072,568 |
Right of use assets - finance leases | 187,269 |  |  | — |
Right of use assets - operating leases | 149,839 |  |  | — |
Land held for future development (1) | 272,332 |  |  | 200,498 |
Buildings and improvements | 13,271,691 |  |  | 13,356,751 |
Tenant improvements | 2,486,269 |  |  | 2,396,932 |
Furniture, fixtures and equipment | 44,462 |  |  | 44,351 |
Construction in progress | 812,408 |  |  | 578,796 |
Total | 22,280,316 |  |  | 21,649,896 |
Less: Accumulated depreciation | (5,050,606 | ) |  | (4,897,777 | )
| $ | 17,229,710 |  |  | $ | 16,752,119 |
_______________ (1) Includes pre-development costs.
Finance Lease, Liability, Maturity [Table Text Block] | The following table provides a maturity analysis for the Company’s lease liabilities related to its operating and finance leases as of June 30, 2019 (in thousands):
| Operating |  | Finance (1)
July 1, 2019 - December 31, 2019 | $ | 4,872 |  |  | $ | 2,494 |
2020 | 10,050 |  |  | 121,499 |
2021 | 24,953 |  |  | 2,096 |
2022 | 18,041 |  |  | 1,632 |
2023 | 10,326 |  |  | 1,039 |
Thereafter | 567,232 |  |  | 73,241 |
Total lease payments | 635,474 |  |  | 202,001 |
Less: interest portion | (436,130 | ) |  | (29,099 | )
Present value of lease payments | $ | 199,344 |  |  | $ | 172,902 |
_______________ (1) Finance lease payments in 2020 and 2024 include approximately $119.8 million and $38.7 million, respectively, related to purchase options that the Company is reasonably certain that it will exercise.
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, 2019 and December 31, 2018 (in thousands):
| June 30, 2019 |  | December 31, 2018
Land | $ | 4,955,593 |  |  | $ | 4,971,475 |
Right of use assets - finance leases | 187,269 |  |  | — |
Right of use assets - operating leases | 149,839 |  |  | — |
Land held for future development (1) | 272,332 |  |  | 200,498 |
Buildings and improvements | 12,976,345 |  |  | 13,059,488 |
Tenant improvements | 2,486,269 |  |  | 2,396,932 |
Furniture, fixtures and equipment | 44,462 |  |  | 44,351 |
Construction in progress | 812,408 |  |  | 578,796 |
Total | 21,884,517 |  |  | 21,251,540 |
Less: Accumulated depreciation | (4,949,822 | ) |  | (4,800,475 | )
| $ | 16,934,695 |  |  | $ | 16,451,065 |
_______________ (1) Includes pre-development costs.
Platform 16 [Member] |
Entity Information [Line Items] |
Finance Lease, Liability, Maturity [Table Text Block] | As of January 24, 2019, the lease payments from the finance lease related to the remaining parcels made available for lease to the Company are as follows (in thousands):
Period from January 24, 2019 through December 31, 2019 | $ | 17,918 |
2020 | 109,460 |
Total expected minimum lease payments | 127,378 |
Interest portion | (4,815 | )
Present value of expected net lease payments | $ | 122,563 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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