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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Summary Of Significant Accounting Policies [Line Items]  
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 10 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
2025$2,328 $9,982 
20261,236 8,862 
2027928 5,648 
2028781 2,419 
2029729 914 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Fair Value of Financial Instruments
The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for December 31, 2024 and December 31, 2023, the financial instruments that are being valued for disclosure purposes, as well as the Level at which they are categorized as defined in ASC 820 “Fair Value Measurements and Disclosures” (“ASC 820”).
Financial InstrumentLevel
3-Month United States treasury billsLevel 1
Unsecured commercial paperLevel 1
Investment in securities (1)Level 1
Unsecured senior notes (2)Level 1
Related party note receivableLevel 3
Notes receivableLevel 3
Sales-type lease receivableLevel 3
Mortgage notes payableLevel 3
Unsecured line of creditLevel 3
Unsecured term loanLevel 3
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(1)See “Investments in Securities” policy above, in this Note 2, for information on its fair values.
(2)If trading volume for the period is low, the valuation could be categorized as Level 2.
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table presents the aggregate carrying value of the Company’s non-recurring fair value financial instruments and the Company’s corresponding estimate of fair value as of December 31, 2024 and December 31, 2023 (in thousands):
 December 31, 2024December 31, 2023
 Carrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
3-Month United States Treasury Bills (1)$— $— $302,746 $302,746 
Related party note receivable, net$88,779 $89,213 $88,779 $90,593 
Note receivable, net4,947 6,187 1,714 1,677 
Sales-type lease receivable, net14,657 13,632 13,704 13,338 
Total$108,383 $109,032 $104,197 $105,608 
Mortgage notes payable, net$4,276,609 $3,808,095 $4,166,379 $3,705,513 
Unsecured senior notes, net10,645,077 10,005,606 10,491,617 9,697,393 
Unsecured line of credit— — — — 
Unsecured term loan, net798,813 799,580 1,198,301 1,196,945 
Unsecured commercial paper500,000 500,000 — — 
Total$16,220,499 $15,113,281 $15,856,297 $14,599,851 
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(1) Per the guidance in ASC 326, the Company concluded that the risk of nonpayment is nonexistent because the U.S. Government has a long history with no credit losses and therefore, no credit loss allowance was recorded.
Schedule of Derivative Assets at Fair Value [Table Text Block]
The following table presents the aggregate fair value of the Company’s interest rate swaps as of December 31, 2024 and December 31, 2023 (in thousands):
Fair valueDecember 31, 2024December 31, 2023
Interest rate swaps$5,252 $1,976 
Dividends Declared
The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared during the years ended December 31, 2024, 2023 and 2022:
Record DatePayment DateDividend (Per Share)Distribution (Per Unit)
December 31, 2024January 30, 2025$0.98 $0.98 
September 30, 2024October 31, 2024$0.98 $0.98 
June 28, 2024July 31, 2024$0.98 $0.98 
March 28, 2024April 30, 2024$0.98 $0.98 
December 29, 2023January 30, 2024$0.98 $0.98 
September 29, 2023October 31, 2023$0.98 $0.98 
June 30, 2023July 31, 2023$0.98 $0.98 
March 31, 2023April 28, 2023$0.98 $0.98 
December 30, 2022January 30, 2023$0.98 $0.98 
September 30, 2022October 31, 2022$0.98 $0.98 
June 30, 2022July 29, 2022$0.98 $0.98 
March 31, 2022April 29, 2022$0.98 $0.98 
December 31, 2021January 28, 2022$0.98 $0.98 
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,
 202420232022
 Per Share%Per Share%Per Share%
Ordinary income$3.22 88.29 %$3.04 72.98 %$3.42 86.60 %
Capital gain income0.03 0.79 %1.12 27.02 %0.53 13.40 %
Return of capital0.40 10.92 %— — %— — %
Total$3.65 (1)100.00 %$4.16 (2)100.00 %$3.95 (3)100.00 %
 _____________
(1)The fourth quarter 2024 regular quarterly dividend was $0.98 per common share, all of which were allocable to 2025.
(2)The fourth quarter 2023 regular quarterly dividend was $0.98 per common share, of which approximately $0.27 per common share was allocated to 2023 and approximately $0.71 per common share was allocated to 2024.
(3)The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocated to 2022 and approximately $0.95 per common share was allocated to 2023.