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Real Estate Schedule of Asset Dispositions (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 USD ($) ft² | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 27, 2025 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sales of real estate |  | $ 682,514 |  | $ 602 | $ 517 |
Gains on sales of real estate |  | $ 176,732 |  | 602 | 517 |
Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 30,000 |  |  |  |
Contractual Sale Price |  | $ 163,090 |  |  |  |
Proceeds from sales of real estate |  | 150,268 |  |  |  |
Gains on sales of real estate |  | $ 64,842 |  |  |  |
Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 684,500 |  |  |  |
Contractual Sale Price |  | $ 407,500 |  |  |  |
Proceeds from sales of real estate |  | 403,740 |  |  |  |
Gains on sales of real estate |  | $ 102,860 |  |  |  |
Office Building [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 409,200 |  |  |  |
Contractual Sale Price |  | $ 132,000 |  |  |  |
Proceeds from sales of real estate |  | 128,506 |  |  |  |
Gains on sales of real estate |  | $ 7,306 |  |  |  |
Land, Residential and Office |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 1,123,700 |  |  |  |
Contractual Sale Price |  | $ 702,590 |  |  |  |
Proceeds from sales of real estate |  | 682,514 |  |  |  |
Gains on sales of real estate | [1] | 175,008 |  |  |  |
Related to prior period sales |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 1,700 |  |  |  |
Boston Properties Limited Partnership |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sales of real estate |  | 682,514 |  | 602 | 517 |
Gains on sales of real estate |  | 179,322 |  | $ 602 | $ 517 |
Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 64,941 |  |  |  |
Boston Properties Limited Partnership | Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 102,860 |  |  |  |
Boston Properties Limited Partnership | Office Building [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 9,796 |  |  |  |
Boston Properties Limited Partnership | Land, Residential and Office |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate | [1] | 177,597 |  |  |  |
Boston Properties Limited Partnership | Related to prior period sales |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | $ 1,700 |  |  |  |
17 Hartwell Avenue | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² | [2] | 30,000 |  |  |  |
Contractual Sale Price |  | $ 21,840 | [2] |  |  | $ 21,800
Proceeds from sales of real estate | [2] | 21,840 |  |  |  |
Gains on sales of real estate | [2] | 18,390 |  |  |  |
17 Hartwell Avenue | Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate | [2] | 18,489 |  |  |  |
Land Parcel at New Dominion Technology Park | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Contractual Sale Price |  | 250 |  |  |  |
Proceeds from sales of real estate |  | 248 |  |  |  |
Gains on sales of real estate |  | 248 |  |  |  |
Land Parcel at New Dominion Technology Park | Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 248 |  |  |  |
Plaza at Almaden | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Contractual Sale Price |  | 13,500 |  |  |  |
Proceeds from sales of real estate |  | 12,659 |  |  |  |
Gains on sales of real estate |  | 124 |  |  |  |
Plaza at Almaden | Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 124 |  |  |  |
Land Parcel at Broadrun | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Contractual Sale Price |  | 37,500 |  |  |  |
Proceeds from sales of real estate |  | 36,613 |  |  |  |
Gains on sales of real estate |  | 35,418 |  |  |  |
Land Parcel at Broadrun | Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | 35,418 |  |  |  |
3625 - 3635 Peterson Way | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Contractual Sale Price |  | 90,000 |  |  |  |
Proceeds from sales of real estate |  | 78,908 |  |  |  |
Gains on sales of real estate |  | 10,662 |  |  |  |
3625 - 3635 Peterson Way | Boston Properties Limited Partnership | Land |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | $ 10,662 |  |  |  |
Proto Kendall Square | Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 166,700 |  |  |  |
Contractual Sale Price |  | $ 171,500 |  |  |  |
Proceeds from sales of real estate |  | 169,413 |  |  |  |
Gains on sales of real estate |  | 53,276 |  |  |  |
Proto Kendall Square | Boston Properties Limited Partnership | Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | $ 53,276 |  |  |  |
Signature at Reston | Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 517,800 |  |  |  |
Contractual Sale Price |  | $ 236,000 |  |  |  |
Proceeds from sales of real estate |  | 234,327 |  |  |  |
Gains on sales of real estate |  | 49,584 |  |  |  |
Signature at Reston | Boston Properties Limited Partnership | Residential Building |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | $ 49,584 |  |  |  |
140 Kendrick Street | Office Building [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 409,200 |  |  |  |
Contractual Sale Price |  | $ 132,000 |  |  |  |
Proceeds from sales of real estate |  | 128,506 |  |  |  |
Gains on sales of real estate |  | 7,306 |  |  |  |
140 Kendrick Street | Boston Properties Limited Partnership | Office Building [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Gains on sales of real estate |  | $ 9,796 |  |  |  |
[1] | Excludes approximately $1.7 million of gains for each of BXP and BPLP, which are primarily related to sales that occurred in prior periods. With the exception of Almaden Boulevard, the fair value of the real estate disposed exceeded the carrying value (see “Impairments” below).
[2] | The Company entered into a joint venture with a third-party to redevelop, own and operate this property. The Company sold the land to the joint venture for approximately $21.8 million in cash. Upon formation of the joint venture, the Company ceased accounting for the property on a consolidated basis and began accounting for the joint venture on an unconsolidated basis using the equity method of accounting, as it does not have a controlling financial or operating interest in the joint venture (See Note 6). The building has been demolished.

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