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Stock Option and Incentive Plan | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Stock Option and Incentive Plan | 15. Stock Option and Incentive Plan At the Company’s 2021 annual meeting of stockholders held on May 20, 2021, its stockholders approved the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”). The 2021 Plan replaced the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”) and no further awards will be issued under the 2012 Plan. The material features of the 2021 Plan include, among other things: (i) the maximum number of shares of common stock reserved and available for issuance under the 2021 Plan is 5,400,000 shares less one share for every one share that was granted between March 4, 2021 and May 19, 2021 under the 2012 Plan, (ii) shares of common stock underlying awards granted under the 2021 Plan or the 2012 Plan that are forfeited, canceled or otherwise terminated (other than by exercise) will be added back to the shares of common stock available for issuance under the 2021 Plan and, with respect to “full-value” awards under the 2021 Plan or the 2012 Plan, shares tendered or held back for taxes and shares previously reserved for issuance pursuant to such an award to the extent that such shares are not issued and are no longer issuable pursuant to such an award (e.g., in the event that a full-value award that may be settled in cash or by issuance of shares of common stock is settled in cash) will be added back to the shares available for issuance under the 2021 Plan, (iii) the award of stock options (both incentive and non-qualified options), stock appreciation rights, restricted stock units, restricted stock, unrestricted stock, dividend equivalent rights, cash-based awards and other equity-based awards (including LTIP Units) is permitted, (iv) stock options may not be repriced and “underwater” stock options may not be exchanged for another award or cash without stockholder approval; and (v) the term of the 2021 Plan ends ten years from the date of stockholder approval, or May 20, 2031. On January 25, 2023, BXP’s Compensation Committee approved the grant of 2023 MYLTIP awards under the 2021 Plan to certain executive officers of BXP, effective February 7, 2023. The 2023 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metrics. Total earned awards under the 2023 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the two components and will range from zero to a maximum of 322,053 LTIP Units with a target of approximately 161,026 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on February 6, 2026, but, in general, may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. The 2023 MYLTIP awards are in the form of LTIP Units issued on the grant date, and they are subject to forfeiture to the extent awards are not earned. Prior to the performance measurement date holders of the 2023 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units. Following the completion of the three-year performance period, the Company will also make a “catch-up” cash payment on the 2023 MYLTIP Units that are ultimately earned in an amount equal to the regular and special distributions, if any, declared during the performance period on a number of shares of BXP’s Common Stock equal to the number of 2023 MYLTIP Units that are earned, less the distributions actually paid to holders of 2023 MYLTIP Units during the performance period on all of the awarded 2023 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2023 MYLTIP awards have an aggregate value of approximately $13.1 million, which amount will generally be amortized into earnings under the graded vesting method. On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 MYLTIP Units that had been previously granted were automatically forfeited. On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited. On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited. BXP issued 73,762, 41,818 and 57,383 shares of restricted common stock and BPLP issued 430,824, 280,616 and 281,640 LTIP Units to employees and non-employee directors under the 2012 Plan and the 2021 Plan during the years ended December 31, 2023, 2022 and 2021, respectively. BXP did not issue any non-qualified stock options under the 2012 Plan or 2021 Plan during the years ended December 31, 2023, 2022 and 2021. BPLP issued 322,053 2023 MYLTIP Units, 254,061 2022 MYLTIP Units and 352,021 2021 MYLTIP Units to employees under the 2012 Plan and 2021 Plan during the years ended December 31, 2023, 2022 and 2021, respectively. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 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 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. Because the 2012 OPP Units and 2013 - 2023 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’s Consolidated Balance Sheets and Partners’ Capital in BPLP’s Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, LTIP Units and 2020 - 2023 MYLTIP Units was approximately $50.2 million, $50.7 million and $49.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. At December 31, 2023, there was (1) an aggregate of approximately $20.7 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and (2) an aggregate of approximately $0.3 million of unrecognized compensation expense related to unvested 2021 - 2023 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.5 years. The shares of restricted stock were valued at approximately $5.4 million ($72.57 per share weighted-average), $4.7 million ($111.47 per share weighted-average) and $5.8 million ($100.60 per share weighted-average) for the years ended December 31, 2023, 2022 and 2021, respectively. LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718. LTIP Units issued during the years ended December 31, 2023, 2022 and 2021 were valued at approximately $29.9 million, $28.9 million and $23.8 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2023, 2022 and 2021 was $69.29, $103.06 and $84.43, respectively. The per unit fair value of each LTIP Unit granted in 2023, 2022 and 2021 was estimated on the date of grant using the following assumptions; an expected life of 5.7 years, 5.7 years and 5.7 years, a risk-free interest rate of 3.67%, 1.71% and 0.65% and an expected price volatility of 32.0%, 31.0% and 30.0%, respectively. There were no non-qualified stock options granted during the years ended December 31, 2023, 2022 and 2021. A summary of the status of BXP’s stock options as of December 31, 2023, 2022 and 2021 and changes during the years then ended are presented below:
|  | Shares |  | Weighted-Average Exercise Price
Outstanding at December 31, 2020 |  | 351,561 |  |  | $ | 96.97 |
Exercised |  | (247,920) |  |  | $ | 96.95 |
Outstanding at December 31, 2021 |  | 103,641 |  |  | $ | 97.01 |
Exercised |  | — |  |  | $ | — |
Outstanding at December 31, 2022 |  | 103,641 |  |  | $ | 97.01 |
Forfeited |  | (103,641) |  |  | $ | — |
Outstanding at December 31, 2023 |  | — |  |  | $ | — |
There were no stock options outstanding as of December 31, 2023. In addition, BXP had 103,641 options exercisable and vested at a weighted-average exercise price of $97.01 at December 31, 2022 and 2021. BXP adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the “Stock Purchase Plan”) to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of the Common Stock during the last ten business days of the purchase period. BXP issued 18,552, 9,813 and 9,846 shares with the weighted-average purchase price equal to $51.93 per share, $87.30 per share and $89.73 per share under the Stock Purchase Plan during the years ended December 31, 2023, 2022 and 2021, respectively.

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