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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
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
2024$3,985 $9,961 
20251,880 9,756 
2026982 8,602 
2027743 5,432 
2028605 2,125 
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, 2023 and December 31, 2022, 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
Investment in securities (1)Level 1
Non-real estate investments (1) (2)Level 2
Unsecured senior notes (3)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” and “Non-Real Estate Investments” policies above for information on their fair values.
(2)Included within Prepaid and Other Assets on the Consolidated Balance Sheets.
(3)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, 2023 and December 31, 2022 (in thousands):
 December 31, 2023December 31, 2022
 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 $90,593 $78,576 $79,220 
Note receivable, net1,714 1,677 — — 
Sales-type lease receivable, net13,704 13,338 12,811 13,045 
Total$104,197 $105,608 $91,387 $92,265 
Mortgage notes payable, net$4,166,379 $3,705,513 $3,272,368 $2,744,479 
Unsecured senior notes, net10,491,617 9,697,393 10,237,968 9,135,512 
Unsecured line of credit— — — — 
Unsecured term loan, net1,198,301 1,196,945 730,000 730,000 
Total$15,856,297 $14,599,851 $14,240,336 $12,609,991 
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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, 2023 and December 31, 2022 (in thousands):
Fair valueDecember 31, 2023December 31, 2022
Interest rate swaps$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, 2023, 2022 and 2021:
Record DatePayment DateDividend (Per Share)Distribution (Per Unit)
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 
September 30, 2021October 29, 2021$0.98 $0.98 
June 30, 2021July 30, 2021$0.98 $0.98 
March 31, 2021April 30, 2021$0.98 $0.98 
December 31, 2020January 28, 2021$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,
 202320222021
 Per Share%Per Share%Per Share%
Ordinary income$3.04 72.98 %$3.42 86.60 %$2.90 73.86 %
Capital gain income1.12 27.02 %0.53 13.40 %0.57 14.57 %
Return of capital— — %— — %0.45 11.57 %
Total$4.16 (1)100.00 %$3.95 (2)100.00 %$3.92 (3)100.00 %
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(1)The fourth quarter 2023 regular quarterly dividend was $0.98 per common share, of which approximately $0.27 per common share was allocable to 2023 and approximately $0.71 per common share was allocable to 2024.
(2)The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.
(3)The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.