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Noncontrolling Interests | 12 Months Ended
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Dec. 31, 2025
Noncontrolling Interest [Abstract] |
Noncontrolling Interest Disclosure [Text Block] | 10. Noncontrolling Interests Noncontrolling interests relate to the interests in BPLP not owned by BXP and interests in consolidated property partnerships not wholly-owned by the Company. As of December 31, 2025, the noncontrolling interests in BPLP consisted of the following:
OP Units |  | LTIP Units (1) |  | 2023 MYLTIP Units |  | 2024 MYLTIP Units |  | 2025 MYLTIP Units |  | 2025 OPP Units (2)
15,590,009 |  | 2,662,140 |  | 322,053 |  | 330,479 |  | 354,940 |  | 711,864
__________ (1)Includes 638,681 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2022 (i.e., 2012 OPP and 2013 - 2022 MYLTIP awards). (2)See Note 15. Noncontrolling Interest—Common Units During the years ended December 31, 2025 and 2024, 291,040 and 1,147,013 OP Units, respectively, were presented by the holders for redemption (including an aggregate of 87,398 and 122,241 OP Units, respectively, issued upon conversion of LTIP Units, 2012 OPP Units and MYLTIP Units) and were redeemed by BXP in exchange for an equal number of shares of Common Stock. At December 31, 2025, BPLP had outstanding the 2023 - 2025 MYLTIP Units and the 2025 OPP Units. Prior to the end of the respective performance period for each plan, holders of LTIP Units issued pursuant to these awards are entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an LTIP Unit, but will not be entitled to receive any special distributions. After the performance period for each plan has ended, (1) the number of LTIP Units, both vested and unvested, that the MYLTIP or 2025 OPP Unit recipients, as applicable, have earned, if any, based on the establishment of a performance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an LTIP Unit and (2) the Company will make a “catch-up” payment on the LTIP Units that are ultimately earned, if any, in an amount equal to the regular and special dividends, if any, declared during the respective performance period on a number of shares of Common Stock equal to the number of 2023 - 2025 MYLTIP Units or 2025 OPP Units that are earned, less the distributions actually paid during the performance period of each respective award, which (a) for the earned 2023 - 2025 MYLTIP Units will be payable in the form of cash and (b) for the earned 2025 OPP Units will be in the form of additional earned 2025 OPP Units, provided that if the total number of earned 2025 OPP Units would exceed the total number of 2025 OPP Units granted, then such excess shall be paid in cash. The following table shows the results for the MYLTIP awards at the end of their respective three-year measurement period (Aggregate value is shown in millions):
|  | Measurement Date |  | Final Payout as a % of Target |  | Aggregate Value |  | Forfeited Units
2022 MYLTIP Awards |  | January 31, 2025 |  | 59 | % |  | $ | 5.4 |  |  | 177,919 |
2021 MYLTIP Awards |  | February 1, 2024 |  | 112 | % |  | $ | 12.6 |  |  | 155,625 |
2020 MYLTIP Awards |  | February 3, 2023 |  | 50 | % |  | $ | 3.8 |  |  | 152,460 |
The following table presents BPLP’s distributions on the OP Units, LTIP Units, MYLTIP Units and 2025 OPP Units paid or declared during the years ended December 31, 2025 and 2024 and 2023:
Record Date |  | Payment Date |  | Distributions per OP Unit and LTIP Unit |  | Distributions per MYLTIP Unit and 2025 OPP Units
December 31, 2025 |  | January 29, 2026 |  | $0.70 |  |  | $0.070 |
September 30, 2025 |  | October 31, 2025 |  | $0.70 |  |  | $0.070 |
June 30, 2025 |  | July 31, 2025 |  | $0.98 |  |  | $0.098 |
March 31, 2025 |  | April 30, 2025 |  | $0.98 |  |  | $0.098 |
December 31, 2024 |  | January 30, 2025 |  | $0.98 |  |  | $0.098 |
September 30, 2024 |  | October 31, 2024 |  | $0.98 |  |  | $0.098 |
June 28, 2024 |  | July 31, 2024 |  | $0.98 |  |  | $0.098 |
March 28, 2024 |  | April 30, 2024 |  | $0.98 |  |  | $0.098 |
December 29, 2023 |  | January 30, 2024 |  | $0.98 |  |  | $0.098 |
September 29, 2023 |  | October 31, 2023 |  | $0.98 |  |  | $0.098 |
June 30, 2023 |  | July 31, 2023 |  | $0.98 |  |  | $0.098 |
March 31, 2023 |  | April 28, 2023 |  | $0.98 |  |  | $0.098 |
December 30, 2022 |  | January 30, 2023 |  | $0.98 |  |  | $0.098 |
A holder of an OP Unit may present the OP Unit to BPLP for redemption at any time (subject to covenants agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, BPLP must redeem the OP Unit for cash equal to the then value of a share of Common Stock of BXP. BXP may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. Based on the last reported price of a share of Common Stock on the New York Stock Exchange of $67.48 per share on December 31, 2025, the value of the OP Units (other than OP Units owned by BXP), and LTIP Units (including the 2012 OPP Units and 2013 - 2022 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at December 31, 2025 was approximately $1.3 billion. Noncontrolling Interests—Property Partnerships The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $2.0 billion and $1.9 billion at December 31, 2025 and December 31, 2024, respectively, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets. On August 27, 2025, the Company acquired its partner’s 45% ownership interest in the consolidated entity that is developing the 343 Madison Avenue project located in New York City, New York for approximately $43.5 million of cash. The acquisition price is equal to the partner’s aggregate unreturned capital contributions to the joint venture and as a result there was no gain on sale recognized in stockholders’ equity for BXP or partners’ capital for BPLP other than transaction costs. Prior to the acquisition, the Company had a 55% ownership interest in the joint venture (See Note 3).

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- Definition The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/810/tableOfContent + Details
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