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Real Estate (Tables)
 9 Months Ended
Sep. 30, 2022
Real Estate Properties [Line Items]  
Schedule of Real Estate Properties
BXP
Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):
September 30, 2022December 31, 2021
Land$5,208,688 $5,061,169 
Right of use assets - finance leases237,505 237,507 
Right of use assets - operating leases167,935 169,778 
Land held for future development (1)601,676 560,355 
Buildings and improvements15,598,033 14,291,214 
Tenant improvements3,061,686 2,894,025 
Furniture, fixtures and equipment52,126 51,695 
Construction in progress670,167 894,172 
Total25,597,816 24,159,915 
Less: Accumulated depreciation(6,170,472)(5,883,961)
$19,427,344 $18,275,954 
_______________
(1)Includes pre-development costs.
Madison Centre  
Real Estate Properties [Line Items]  
Asset Acquisition [Table Text Block] The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):
Land$104,641 
Building and improvements505,766 
Tenant improvements58,570 
In-place lease intangibles74,598 
Above-market lease intangibles3,794 
Below-market lease intangibles(23,114)
Net assets acquired$724,255 
Schedule of Finite-Lived Intangible Assets Acquired
The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre from May 17, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

Acquired In-Place Lease IntangiblesAcquired Above-Market Lease IntangiblesAcquired Below-Market Lease Intangibles
Period from May 17, 2022 through December 31, 2022$7,266 $640 $2,011 
202312,200 1,098 3,442 
202410,842 254 3,411 
202510,770 254 3,398 
202610,306 254 3,210 
20279,161 254 2,805 
125 Broadway  
Real Estate Properties [Line Items]  
Asset Acquisition [Table Text Block] The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):
Land$126,364 
Building and improvements403,588 
Tenant improvements30,074 
In-place lease intangibles49,137 
Below-market lease intangibles(16,725)
Net assets acquired$592,438 
Schedule of Finite-Lived Intangible Assets Acquired
The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired below-market lease intangible for 125 Broadway from September 16, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

Acquired In-Place Lease IntangiblesAcquired Below-Market Lease Intangible
Period from September 16, 2022 through December 31, 2022$2,185 $744 
20238,740 2,975 
20248,740 2,975 
20258,740 2,975 
20268,740 2,975 
20278,740 2,975 
Boston Properties Limited Partnership  
Real Estate Properties [Line Items]  
Schedule of Real Estate Properties
BPLP
Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):
September 30, 2022December 31, 2021
Land$5,113,979 $4,964,986 
Right of use assets - finance leases237,505 237,507 
Right of use assets - operating leases167,935 169,778 
Land held for future development (1)601,676 560,355 
Buildings and improvements15,325,228 14,014,010 
Tenant improvements3,061,686 2,894,025 
Furniture, fixtures and equipment52,126 51,695 
Construction in progress670,167 894,172 
Total25,230,302 23,786,528 
Less: Accumulated depreciation(6,055,172)(5,772,018)
$19,175,130 $18,014,510 
_______________
(1)Includes pre-development costs.