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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |
Property, Plant and Equipment [Table Text Block] | Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:
Land improvements |  | 25 to 40 years
Buildings and improvements |  | 10 to 40 years
Tenant improvements |  | Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment |  | 3 to 7 years
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands). Accrued rental income as reported on the Consolidated Balance Sheets represents rental income recognized in excess of rent payments actually received pursuant to the terms of the individual lease agreements.
|  | Acquired Above-Market Lease Intangibles |  | Acquired Below-Market Lease Intangibles
2016 |  | $ | 14,210 |  |  | $ | 43,809 |
2017 |  | 11,756 |  |  | 33,112 |
2018 |  | 8,637 |  |  | 31,272 |
2019 |  | 7,106 |  |  | 26,434 |
2020 |  | 5,400 |  |  | 9,852 |
The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).
| Acquired In-Place Lease Intangibles
2016 | $ | 52,456 |
2017 | 36,438 |
2018 | 31,913 |
2019 | 26,067 |
2020 | 13,325 |
Schedule Of Future Contractual Minimum Lease Payments Under Non-Cancelable Ground Leases [Table Text Block] | The future contractual minimum lease payments to be made by the Company as of December 31, 2015, under non-cancelable ground leases which expire on various dates through 2114, are as follows:
Years Ending December 31, | (in thousands)
2016 | $ | 15,188 |
2017 | 30,658 |
2018 | 11,507 |
2019 | 9,693 |
2020 | 9,870 |
Thereafter | 594,701 |
The table includes the Company’s 99-year ground and air rights lease related to its 200 Clarendon Street property’s adjacent 100 Clarendon Street garage and Back Bay Station concourse level. The Company expects to incur the remaining contractual ground lease payments aggregating approximately $28.9 million over the next three years with no payments thereafter. The Company is recognizing these amounts on a straight-line basis over the 99-year term of the ground and air rights lease (See Note 3).
Fair Value, by Balance Sheet Grouping [Table Text Block] | The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of December 31, 2015 and December 31, 2014 (in thousands):
| December 31, 2015 |  | December 31, 2014
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Mortgage notes payable | $ | 3,438,714 |  |  | $ | 3,503,746 |  |  | $ | 4,309,484 |  |  | $ | 4,449,541 |
Mezzanine notes payable | 308,482 |  |  | 306,103 |  |  | 309,796 |  |  | 306,156 |
Unsecured senior notes | 5,289,317 |  |  | 5,547,738 |  |  | 5,287,704 |  |  | 5,645,819 |
Total | $ | 9,036,513 |  |  | $ | 9,357,587 |  |  | $ | 9,906,984 |  |  | $ | 10,401,516 |
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes, Table [Table Text Block] | The tax treatment of common dividends per share for federal income tax purposes is as follows:
|  | For the year ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | Per Share |  | % |  | Per Share |  | % |  | Per Share |  | %
Ordinary income |  | $ | 2.34 |  |  | 57.97 | % |  | $ | — |  |  | — | % |  | $ | 2.31 |  |  | 48.71 | %
Capital gain income |  | 1.70 |  |  | 42.03 | % |  | 6.82 |  |  | 100.00 | % |  | 2.44 |  |  | 51.29 | %
Total |  | $ | 4.04 |  | (1) | 100.00 | % |  | $ | 6.82 |  | (2) | 100.00 | % |  | $ | 4.75 |  | (3) | 100.00 | %
_____________
(1) | The fourth quarter 2015 dividend of $1.90 per common share consists of a $1.25 per common share special dividend and a $0.65 per common share regular quarterly dividend, approximately $1.35 per common share was allocable to 2015 and approximately $0.55 per common share is allocable to 2016.
(2) | The fourth quarter 2014 dividend of $5.15 per common share consists of a $4.50 per common share special dividend and a $0.65 per common share regular quarterly dividend, approximately $4.41 per common share was allocable to 2014 and approximately $0.74 per common share is allocable to 2015.
(3) | The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend, approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.
Gaap Reconciliation Of Net Income To Taxable Income, Table [Table Text Block] | The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income:
|  | For the year ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Net income attributable to Boston Properties, Inc. |  | $ | 583,106 |  |  | $ | 443,611 |  |  | $ | 749,811 |
Straight-line rent and net “above-” and “below-market” rent adjustments |  | (92,483 | ) |  | (91,733 | ) |  | (74,445 | )
Book/Tax differences from depreciation and amortization |  | 307,115 |  |  | 239,681 |  |  | 170,370 |
Book/Tax differences from interest expense |  | (43,349 | ) |  | (43,148 | ) |  | (7,912 | )
Book/Tax differences on gains/(losses) from capital transactions |  | (74,482 | ) |  | 943,778 |  | (1) | (124,413 | )
Book/Tax differences from stock-based compensation |  | 22,008 |  |  | 32,483 |  |  | 42,146 |
Tangible Property Regulations (2) |  | (74,887 | ) |  | (442,650 | ) |  | — |
Other book/tax differences, net |  | (15,259 | ) |  | (7,945 | ) |  | (4,885 | )
Taxable income |  | $ | 611,769 |  |  | $ | 1,074,077 |  |  | $ | 750,672 |
__________
(1) | Consists primarily of the gain on sale of real estate for tax purposes related to the October 2014 sale by the Company of a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston, which was accounted for as an equity transaction for GAAP purposes with no gain on sale of real estate recognized.
(2) | In September 2013, the Internal Revenue Service released final Regulations governing when taxpayers like Boston Properties, Inc. must capitalize and depreciate costs for acquiring, maintaining, repairing and replacing tangible property and when taxpayers can deduct such costs. These final Regulations were effective for tax years beginning on or after January 1, 2014. These Regulations permitted Boston Properties, Inc. to deduct certain types of expenditures that were previously required to be capitalized. The Regulations also allowed Boston Properties, Inc. to make a one-time election in 2014 to immediately deduct certain amounts that were capitalized in previous years that are not required to be capitalized under the new Regulations. The one-time deduction included above totaled approximately $385.6 million for the year ended December 31, 2014.
Boston Properties Limited Partnership [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Gaap Reconciliation Of Net Income To Taxable Income, Table [Table Text Block] | The following table reconciles GAAP net income attributable to Boston Properties Limited Partnership to taxable income:
|  | For the year ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Net income attributable to Boston Properties Limited Partnership |  | $ | 659,248 |  |  | $ | 509,629 |  |  | $ | 849,573 |
Straight-line rent and net “above-” and “below-market” rent adjustments |  | (103,227 | ) |  | (102,319 | ) |  | (82,904 | )
Book/Tax differences from depreciation and amortization |  | 329,629 |  |  | 253,590 |  |  | 174,384 |
Book/Tax differences from interest expense |  | (48,385 | ) |  | (48,128 | ) |  | (8,811 | )
Book/Tax differences on gains/(losses) from capital transactions |  | (67,602 | ) |  | 1,065,518 |  | (1) | (138,300 | )
Book/Tax differences from stock-based compensation |  | 24,565 |  |  | 36,232 |  |  | 46,935 |
Tangible Property Regulations (2) |  | (83,587 | ) |  | (493,731 | ) |  | — |
Other book/tax differences, net |  | (14,561 | ) |  | (11,403 | ) |  | 8,589 |
Taxable income |  | $ | 696,080 |  |  | $ | 1,209,388 |  |  | $ | 849,466 |
__________
(1) | Consists primarily of the gain on sale of real estate for tax purposes related to the October 2014 sale by the Company of a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston, which was accounted for as an equity transaction for GAAP purposes with no gain on sale of real estate recognized.
(2) | In September 2013, the Internal Revenue Service released final Regulations governing when taxpayers like Boston Properties Limited Partnership must capitalize and depreciate costs for acquiring, maintaining, repairing and replacing tangible property and when taxpayers can deduct such costs. These final Regulations were effective for tax years beginning on or after January 1, 2014. These Regulations permitted Boston Properties Limited Partnership to deduct certain types of expenditures that were previously required to be capitalized. The Regulations also allowed Boston Properties Limited Partnership to make a one-time election in 2014 to immediately deduct certain amounts that were capitalized in previous years that are not required to be capitalized under the new Regulations. The one-time deduction included above totaled approximately $430.1 million for the year ended December 31, 2014.

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