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Impairment of Long-Lived Assets Held and Used (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss $ 68,901 $ 0 $ 68,901 $ 13,615
Wholly Owned Properties        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 68,900      
Plaza at Almaden        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss [1] 25,515      
1330 Connecticut Avenue        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 20,358      
Shady Grove Parcel Three        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 13,913      
North First Business Park        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 9,115      
Boston Properties Limited Partnership        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 65,988 $ 0 $ 65,988 $ 13,615
Boston Properties Limited Partnership | Wholly Owned Properties        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 66,000      
Boston Properties Limited Partnership | Plaza at Almaden        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss [1] 25,515      
Boston Properties Limited Partnership | 1330 Connecticut Avenue        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 17,460      
Boston Properties Limited Partnership | Shady Grove Parcel Three        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss 13,913      
Boston Properties Limited Partnership | North First Business Park        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment loss $ 9,100      
[1] See Note 14.