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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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+ 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 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
-Paragraph 12
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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