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Stock Option and Incentive Plan | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock Option and Incentive Plan | 13. Stock Option and Incentive Plan On January 22, 2025, BXP’s Compensation Committee approved the 2025 Multi-Year Long-Term Incentive Program (the “2025 MYLTIP”) awards under the BXP, Inc. 2021 Stock Incentive Plan (the “2021 Plan”) to certain executive officers of BXP. The 2025 MYLTIP awards consist of three components. Two of the components are each weighted 40% and utilize BXP’s TSR and BXP’s diluted Funds from Operations (“FFO”) per share growth, respectively, over a three-year measurement period as the performance metrics and the third component, weighted 20%, utilizes an average leverage ratio as the performance metric. Earned awards will range from zero to a maximum of 354,940 LTIP Units depending on BXP’s performance under the three components, with a target of approximately 177,470 LTIP Units. Under ASC 718 “Compensation – Stock Compensation,” the 2025 MYLTIP awards have an aggregate value of approximately $12.7 million. On January 31, 2025, the three-year measurement period for the Company’s 2022 MYLTIP awards ended and, based on BXP’s absolute and relative TSR performance, the final payout was determined to be 59% of target, or an aggregate of approximately $5.4 million (after giving effect to employee separations). As a result, an aggregate of 177,919 2022 MYLTIP Units that had been previously granted were automatically forfeited. During the nine months ended September 30, 2025, BXP issued 55,571 shares of restricted common stock and BPLP issued 406,646 LTIP Units and 354,940 2025 MYLTIP Units to employees, the life sciences advisory board members and non-employee directors under the 2021 Plan. The grantees paid $0.25 per LTIP Unit and 2025 MYLTIP Unit. When issued, LTIP Units are not economically equivalent in value to a share of Common Stock, but over time can increase in value to one-for-one parity with Common Stock if there is sufficient appreciation in the value of the Company’s assets. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets of BXP and BPLP. A substantial majority of the grants of restricted common stock and LTIP Units to employees vest in four equal annual installments. Restricted common stock is measured at fair value on the date of grant based on the number of shares granted and the closing price of BXP’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. The shares of restricted common stock granted during the nine months ended September 30, 2025 were valued at approximately $4.0 million. The LTIP Units granted were valued at approximately $27.0 million using a Monte Carlo simulation method model. Because the 2012 OPP Units and 2013 - 2025 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. The Company recognizes forfeitures as they occur on its awards of stock-based compensation. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in BXP, Inc.’s Consolidated Balance Sheets and Partners’ Capital in Boston Properties Limited Partnership’s Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, LTIP Units and MYLTIP Units was approximately $4.4 million and $4.0 million for the three months ended September 30, 2025 and 2024, respectively, and $39.0 million and $38.5 million for the nine months ended September 30, 2025 and 2024, respectively. At September 30, 2025, there was (1) an aggregate of approximately $24.3 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and (2) an aggregate of approximately $0.7 million of unrecognized compensation expense related to unvested 2023 - 2025 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.3 years.

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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