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Subsequent Events (Details)

12 Months Ended

Feb. 06, 2026

USD ($)

shares

Feb. 03, 2026

USD ($)

shares

Feb. 02, 2026

USD ($)

Jan. 30, 2026

shares

Jan. 14, 2026

USD ($)

ft²

buildings

Jan. 02, 2026

USD ($)

ft²

buildings

Dec. 31, 2025

USD ($)

shares

Dec. 31, 2024

USD ($)

shares

Dec. 31, 2023

USD ($)

shares

Feb. 25, 2026

USD ($)

ft²

apartments

Feb. 05, 2026

USD ($)

Jan. 16, 2026

ft²

Jan. 16, 2025

ft²

Subsequent Event [Line Items]

Common stock, shares issued | shares

158,627,198

158,253,895

Repayments of Unsecured Debt

$ 850,000,000

$ 700,000,000

$ 500,000,000

Vesting Period

4 years

Restricted Stock [Member]

Subsequent Event [Line Items]

Number of shares issued | shares

56,273

83,316

73,762

Gateway Commons Complex [Member]

Subsequent Event [Line Items]

Ownership Percentage

^[1]

50.00%

Reston Next Retail

Subsequent Event [Line Items]

Net Rentable Area (in sf) | ft²

30,000

Boston Properties Limited Partnership

Subsequent Event [Line Items]

Debt

$ 9,850,000,000

Repayments of Unsecured Debt

$ 850,000,000

$ 700,000,000

$ 500,000,000

Boston Properties Limited Partnership | LTIP Units [Member]

Subsequent Event [Line Items]

Number of shares issued | shares

406,646

451,044

430,824

Boston Properties Limited Partnership | 3.766% unsecured senior notes | Senior Notes

Subsequent Event [Line Items]

Debt

^[2]

$ 1,000,000,000

Debt Instrument, Interest Rate, Stated Percentage

^[2]

3.65%

Subsequent Event [Member] | Restricted Stock [Member]

Subsequent Event [Line Items]

Common stock, shares issued | shares

89,114

Subsequent Event [Member] | MYLTIP 2026

Subsequent Event [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award

The 2026 MYLTIP awards consists of three components. Two of the components are each weighted 40% and utilize BXP’s TSR and BXP’s diluted FFO per share growth, respectively, over a three year measurement period as the performance metrics and the third component utilizes a leverage ratio as the performance metric.

Vesting Period

3 years

Common stock available for issuance, target | shares

229,195

Value of MYLTIP Awards

$ 14,600,000

Subsequent Event [Member] | MYLTIP 2023

Subsequent Event [Line Items]

Vesting Period

3 years

Value of MYLTIP Awards

$ 9,900,000

Final awards percentage of target

95.00%

Forfeitures, in units | shares

168,717

Subsequent Event [Member] | Maximum [Member] | MYLTIP 2026

Subsequent Event [Line Items]

Common stock available for issuance | shares

458,393

Subsequent Event [Member] | Minimum [Member] | MYLTIP 2026

Subsequent Event [Line Items]

Common stock available for issuance | shares

0

Subsequent Event [Member] | Gateway Commons Complex [Member] | Unconsolidated Properties

Subsequent Event [Line Items]

Ownership Percentage

50.00%

Contractual Sale Price

$ 150,000,000.0

Net Rentable Area (in sf) | ft²

792,700

Number of buildings | buildings

5

Subsequent Event [Member] | North First Business Park

Subsequent Event [Line Items]

Contractual Sale Price

$ 50,500,000

Net Rentable Area (in sf) | ft²

191,000

Number of buildings | buildings

5

Subsequent Event [Member] | Reston Next Retail

Subsequent Event [Line Items]

Net Rentable Area (in sf) | ft²

30,000

Subsequent Event [Member] | Shady Grove Parcel One

Subsequent Event [Line Items]

Contractual Sale Price

$ 24,700,000

Subsequent Event [Member] | The Lofts at Atlantic Wharf

Subsequent Event [Line Items]

Contractual Sale Price

$ 55,500,000

Net Rentable Area (in sf) | ft²

87,000

Number of Units in Real Estate Property | apartments

86

Subsequent Event [Member] | Boston Properties Limited Partnership | LTIP Units [Member]

Subsequent Event [Line Items]

Number of shares issued | shares

429,396

Subsequent Event [Member] | Boston Properties Limited Partnership | 3.766% unsecured senior notes | Senior Notes

Subsequent Event [Line Items]

Debt

$ 1,000,000,000.0

Debt Instrument, Interest Rate, Stated Percentage

3.65%

Repayments of Unsecured Debt

$ 1,000,000,000.0

Debt Instrument, Increase, Accrued Interest

$ 18,300,000

[1]	During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment. On January 2, 2026, the Company completed the sale of its ownership interest in the joint venture (See Note 17).
[2]	See Note 17.

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