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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Fair Value of Financial Instruments
The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”) (see “New Accounting Pronouncements Adopted—Fair Value Measurement”).
Financial InstrumentLevel
Unsecured senior notes (1)Level 1
Related party note receivableLevel 3
Notes receivableLevel 3
Mortgage notes payableLevel 3
Unsecured term loan / line of creditLevel 3
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(1) If trading volume for the period is low, the valuation could be categorized as Level 2.
Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from those estimates.
The following table identifies the range and weighted average discount rate for the significant unobservable inputs for the Company’s Level 3 fair value measured instruments as of December 31, 2020.
Financial InstrumentLevelRangeWeighted Average
Related party note receivableLevel 33.64%3.64%
Notes receivableLevel 3
3.60% - 8.00%
5.87%
Mortgage notes payableLevel 3
2.00% - 3.04%
2.21%
Unsecured term loan / line of creditLevel 31.04%1.04%
In addition, the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.
Property, Plant and Equipment
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 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).
Acquired Above-Market Lease IntangiblesAcquired Below-Market Lease Intangibles
2021$3,019 $6,193 
2022354 5,437 
2023183 5,296 
2024135 3,780 
2025135 3,775 
Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred (See “Leases” ).
Fair Value, by Balance Sheet Grouping [Table Text Block]
 December 31, 2020December 31, 2019
 Carrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
Related party note receivable, net$77,552 $84,579 $80,000 $81,931 
Note receivable, net18,729 19,372 15,920 14,978 
Total$96,281 $103,951 $95,920 $96,909 
Mortgage notes payable, net$2,909,081 $3,144,150 $2,922,408 $2,984,956 
Unsecured senior notes, net9,639,287 10,620,527 8,390,459 8,826,375 
Unsecured line of credit— — — — 
Unsecured term loan, net499,390 500,326 498,939 500,561 
Total$13,047,758 $14,265,003 $11,811,806 $12,311,892 
Dividends Declared
The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid or declared in 2020 and during the year ended December 31, 2019:
Record DatePayment DateDividend (Per Share)Distribution (Per Unit)
December 31, 2020January 28, 2021$0.98 $0.98 
September 30, 2020October 30, 2020$0.98 $0.98 
June 30, 2020July 31, 2020$0.98 $0.98 
March 31, 2020April 30, 2020$0.98 $0.98 
December 31, 2019January 30, 2020$0.98 $0.98 
December 31, 2019January 30, 2020$0.98 $0.98 
September 30, 2019October 31, 2019$0.95 $0.95 
June 28, 2019July 31, 2019$0.95 $0.95 
March 29, 2019April 30, 2019$0.95 $0.95 
December 31, 2018January 30, 2019$0.95 $0.95 
Dividend Paid [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Dividends Declared
The tax treatment of common dividends per share for federal income tax purposes is as follows: 
 For the year ended December 31,
 202020192018
 Per Share%Per Share%Per Share%
Ordinary income$2.52 64.91 %$2.99 94.84 %$2.79 78.17 %
Capital gain income0.99 25.49 %0.16 5.16 %0.78 21.83 %
Return of capital0.37 9.60 %— — %— — %
Total$3.88 (1)100.00 %$3.15 (2)100.00 %$3.57 (3)100.00 %
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(1)The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.
(2)The fourth quarter 2019 regular quarterly dividend was $0.98 per common share of which approximately $0.04 per common share was allocable to 2019 and approximately $0.94 per common share was allocable to 2020.
(3)The fourth quarter 2018 regular quarterly dividend was $0.95 per common share of which approximately $0.69 per common share was allocable to 2018 and approximately $0.26 per common share was allocable to 2019.