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Impairment of Long-Lived Assets Held and Used (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss $ 85,803 $ 13,615 $ 0
Plaza at Almaden | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 25,515    
1330 Connecticut Avenue | Office Building [Member]      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 20,358    
North First Business Park | Office Building [Member]      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss [1] 14,971    
Shady Grove Parcel Three | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 13,913    
Springfield Metro Center | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 11,046    
Boston Properties Limited Partnership      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 82,890 $ 13,615 $ 0
Boston Properties Limited Partnership | Plaza at Almaden | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 25,515    
Boston Properties Limited Partnership | 1330 Connecticut Avenue | Office Building [Member]      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 17,461    
Boston Properties Limited Partnership | North First Business Park | Office Building [Member]      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss [1] 14,955    
Boston Properties Limited Partnership | Shady Grove Parcel Three | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss 13,913    
Boston Properties Limited Partnership | Springfield Metro Center | Land      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment loss $ 11,046    
[1] See Note 17.