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Impairment of Long-Lived Assets Held and Used (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-2 + Details
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