BXP, Inc. (NYSE: BXP) (“BXP” or the “Company”) is the largest publicly traded developer, owner, and manager of premier workplaces in the United States, concentrated in six dynamic gateway markets - Boston, Los Angeles, New York, San Francisco, Seattle, and Washington, DC. BXP has delivered places that power progress for our clients and communities for more than 55 years. BXP is a fully integrated real estate company, organized as a real estate investment trust (REIT). As of December 31, 2025, including properties owned by joint ventures, BXP’s portfolio totals 52.6 million square feet and 179 properties, including 8 properties under construction/redevelopment. BXP’s properties include 157 office properties, 14 retail properties (including one retail property under construction), seven residential properties (including three residential properties under construction) and one hotel. BXP is well-known for its in-house building management expertise and responsiveness to clients’ needs. BXP holds a superior track record of developing premium Central Business District (CBD) office buildings, successful mixed-use complexes, suburban office centers and build-to-suit projects for a diverse array of creditworthy clients. BXP actively works to promote its growth and operations in a sustainable and responsible manner.  BXP has earned a thirteenth consecutive GRESB “Green Star” recognition and the highest GRESB 5-star Rating and was named one of the world’s most sustainable companies by TIME Magazine. BXP, an S&P 500 company, was founded in 1970 by Mortimer B. Zuckerman and Edward H. Linde and became a public company in 1997.

This Supplemental package contains “forward-looking statements” as defined in the Private Securities Litigation Reform Act of 1995. You can identify these statements by our use of the words “anticipates,” “believes,” “budgeted,” “could,” “estimates,” “expects,” “guidance,” “intends,” “may,” “might,” “plans,” “projects,” “should,” “will,” and similar expressions that do not relate to historical matters. These statements are based on our current plans, expectations, projections and assumptions about future events. You should exercise caution in interpreting and relying on forward-looking statements because they involve known and unknown risks, uncertainties and other factors which are, in some cases, beyond BXP’s control. If our underlying assumptions prove inaccurate, or known or unknown risks or uncertainties materialize, actual results could differ materially from those expressed or implied by the forward-looking statements. These factors include, without limitation, the risks and uncertainties related to adverse changes in general economic and capital market conditions, including continued inflation, elevated interest rates, supply chain disruptions, dislocation and volatility in capital markets, potential longer-term changes in consumer and client behavior resulting from the severity and duration of any downturn in the U.S. or global economy, general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases on favorable terms, sustained changes in client preferences and space utilization, dependence on clients’ financial condition, and competition from other developers, owners and operators of real estate), the impact of adverse political conditions, including policy changes by the presidential administration, such as the direct and indirect negative impacts that new and increased tariffs may have on (1) our current and prospective clients and their demand for office space and (2) the costs and availability of construction materials and the economic returns on our construction and development activities, and prolonged government shutdowns or disruptions, the impact of geopolitical conflicts, the uncertainties of investing in new markets, the costs and availability of financing, the effectiveness of our hedging contracts, the ability of our joint venture partners to satisfy their obligations, the effects of local, national and international economic and market conditions, the effects of acquisitions, dispositions and possible impairment charges on our operating results, the impact of newly adopted accounting principles on the Company’s accounting policies and on period-to-period comparisons of financial results, the uncertainties of costs to comply with regulatory changes and other risks and uncertainties detailed from time to time in the Company’s filings with the Securities and Exchange Commission. These forward-looking statements speak only as of the date of issuance of this report and are not guarantees of future results, performance or achievements. BXP does not undertake a duty to update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as otherwise required by law.

This Supplemental package includes non-GAAP financial measures, which are accompanied by what the Company considers the most directly comparable financial measures calculated and presented in accordance with GAAP. Quantitative reconciliations of the differences between the most directly comparable GAAP financial measures and the non-GAAP financial measures presented are provided within this Supplemental package. Definitions of these non-GAAP financial measures and statements of the reasons why management believes the non-GAAP measures provide useful information to investors about the Company’s financial condition and results of operations, and, if applicable, the other purposes for which management uses the measures, can be found in the Definitions section of this Supplemental starting on page 57.

The Company also presents “BXP’s Share” of certain of these measures, which are non-GAAP financial measures that are calculated as the consolidated amount calculated in accordance with GAAP, plus the Company’s share of the amount from the Company’s unconsolidated joint ventures (calculated based upon the Company’s percentage ownership interest and, in some cases, after priority allocations), minus the Company’s partners’ share of the amount from the Company’s consolidated joint ventures (calculated based upon the partners’ percentage ownership interests and, in some cases, after income allocation to private REIT shareholders and their share of fees due to the Company).  Management believes that presenting “BXP’s Share” of these measures provides useful information to investors regarding the Company’s financial condition and/or results of operations because the Company has several significant joint ventures and, in some cases, the Company exercises significant influence over, but does not control, the joint venture, in which case GAAP requires that the Company account for the joint venture entity using the equity method of accounting and the Company does not consolidate it for financial reporting purposes. In other cases, GAAP requires that the Company consolidate the venture even though the Company’s partner(s) owns a significant percentage interest. As a result, management believes that presenting BXP’s Share of various financial measures in this manner can help investors better understand the Company’s financial condition and/or results of operations after taking into account its true economic interest in these joint ventures.  The Company cautions investors that the ownership percentages used in calculating “BXP’s Share” of these measures may not completely and accurately depict all of the legal and economic implications of holding an interest in a consolidated or unconsolidated joint venture. For example, in addition to partners’ interests in profits and capital, venture agreements vary in the allocation of rights regarding decision making (both routine and major decisions), distributions, transferability of interests, financings and guarantees, liquidations and other matters. As a result, presentations of “BXP’s Share” of a financial measure should not be considered a substitute for, and should only be considered together with and as a supplement to, the Company’s financial information presented in accordance with GAAP. Unless noted otherwise, reconciliations of “BXP’s Share” of these financial measures can be found in the Reconciliations section of this Supplemental package starting on page 61.

(Cover photo: 100 Causeway Street, Boston, MA)

(as of December 31, 2025)

BXP’s primary business objective is to maximize return on investment in an effort to provide its investors with the greatest possible total return in all points of the economic cycle. To achieve this objective, the key tenets of our business strategy are to:

•continue to embrace our leadership position in the premier workplace segment and leverage our strength in portfolio quality, client relationships, development skills, market penetration, and sustainability to profitably build market share;

•maintain a keen focus on select dynamic gateway markets that exhibit the strongest economic growth and investment characteristics over time - currently Boston, Los Angeles, New York, San Francisco, Seattle, and Washington, DC;

•invest in the highest quality buildings (primarily premier workplaces) with unique amenities and desirable locations that are able to maintain high occupancy rates and achieve premium rental rates through economic cycles;

•maintain scale and a full-service real estate capability (leasing, development, construction, marketing, legal, and property management) in our markets to ensure we (1) see all relevant investment deal flow, (2) maintain an ability to execute on all types of real estate opportunities, such as acquisitions, dispositions, repositioning and development, throughout the real estate investment cycle, (3) provide superior service to our clients and (4) develop and manage our assets in the most sustainable manner possible;

•ensure a strong balance sheet to maintain consistent access to capital and the ability to make new investments at opportune times;

•pursue attractive asset class adjacencies where we have a track record of success, such as life sciences and residential development;

•recycle capital for future investment through disposing of assets that no longer meet our investment profile or provide an opportunity for an attractive sale price relative to reinvestment;

•maintain a leadership position in sustainability innovation to minimize emissions from BXP’s development and in-service portfolio, as well as to provide clients sustainable solutions for their space use needs; and

•foster a culture and reputation of integrity, excellence and purposefulness, making us the employer of choice for talented real estate professionals, the landlord and developer of choice for our clients, as well as the counterparty of choice for real estate industry participants.

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1Common units and LTIP units are units of limited partnership interest in Boston Properties Limited Partnership, the entity through which the Company conducts substantially all of its business.

2For additional detail, see page 28.

3For the Company’s definitions and related disclosures, see the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

BXP’s guidance for first quarter and full year 2026 for diluted earnings per common share attributable to BXP, Inc. (EPS) and diluted funds from operations (FFO) per common share attributable to BXP, Inc. is set forth and reconciled below.  Except as described below, the estimates reflect management’s view of current and future market conditions, including assumptions with respect to rental rates, occupancy levels, interest rates, the timing of the lease-up of available space, the timing of development cost outlays and development deliveries, and the earnings impact of the events referenced in the Company’s earnings release issued on January 27, 2026 and those referenced during the related conference call.  The estimates do not include (1) possible future gains or losses or the impact on operating results from other possible future property acquisitions or dispositions not under contract as of the date hereof, (2) the impacts of any other capital markets activity, (3) future write-offs or reinstatements of accounts receivable and accrued rent balances, or (4) future impairment charges. EPS estimates may fluctuate as a result of several factors, including changes in the recognition of depreciation and amortization expense, impairment losses on depreciable real estate, and any gains or losses associated with disposition activity. BXP is not able to assess at this time the potential impact of these factors on projected EPS. By definition, FFO does not include real estate-related depreciation and amortization, impairment losses on depreciable real estate, or gains or losses associated with disposition activities. For a complete definition of FFO and statements of the reasons why management believes it provides useful information to investors, see page 60. There can be no assurance that BXP’s actual results will not differ materially from the estimates set forth below.

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1 Excludes development properties placed into service in 2026.

2 Excludes estimated changes in the market value of the Company’s deferred compensation plan and gains (losses) from investments in securities.

(unaudited and in thousands, except ratios and per share amounts)

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1For a quantitative reconciliation of FFO attributable to BXP, Inc. and Diluted FFO per share, see page 7.

2For a quantitative reconciliation of FAD, see page 8. FAD Payout Ratio equals distributions to common shareholders and unitholders (excluding any special distributions) divided by FAD.

3See the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

4Represents the net adjustment for above- and below-market leases that are amortized over the terms of the respective leases in place at the property acquisition dates.

5For the three months ended December 31, 2025, includes gains on sales of approximately $51.4 million. For the three months ended September 30, 2025, includes a non-cash impairment charge of approximately $145.1 million.

6For a quantitative reconciliation for the three months ended December 31, 2025, see page 37.

7For a quantitative reconciliation for the three months ended December 31, 2025, see page 34.

8For a quantitative reconciliation for the three months ended December 31, 2025 and September 30, 2025, see page 32.

9For a quantitative reconciliation for the three months ended December 31, 2025 and September 30, 2025, see page 31.

10For a quantitative reconciliation for the three months ended December 31, 2025 and September 30, 2025, see pages 11, 67 and 68.

11Represents signed leases for which revenue recognition has commenced in accordance with GAAP. Excludes hotel and residential properties.

12Represents signed leases for which revenue recognition has commenced in accordance with GAAP and signed leases for vacant space with future commencement dates. Excludes hotel and residential properties.

13For a quantitative reconciliation for December 31, 2025, see page 28.

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1Includes $0.8 million and $2.4 million for the three months ended December 31, 2025 and September 30, 2025, respectively, related to the Company’s deferred compensation plan.

2For the three months ended December 31, 2025, includes gains on sales of approximately $51.4 million. For the three months ended September 30, 2025, includes a non-cash impairment charge of approximately $145.1 million.

3For additional detail, see page 14.

4Primarily related to impairment losses recognized in the relevant periods for properties / land that were sold or expected to be sold.

5For additional detail, see page 7.

(unaudited and dollars in thousands, except per share amounts)

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1See the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

2For a quantitative reconciliation for the three months ended December 31, 2025, see page 34.

3For a quantitative reconciliation for the three months ended December 31, 2025, see page 37.

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1See the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

2For a quantitative reconciliation for the three months ended December 31, 2025, see page 34.

3For additional information for the three months ended December 31, 2025, see page 37.

4Consists of lease transaction costs that qualify as rent inducements in accordance with GAAP. Lease transaction costs are generally included in 2nd generation tenant improvements and leasing commissions in the period the lease commences.

5Includes the straight-line impact of the Company’s 99-year ground and air rights lease related to the Company’s 100 Clarendon Street garage and Back Bay Transit Station. The Company has allocated contractual ground lease payments aggregating approximately $39.0 million, which it expects to incur by the end of 2027 with no payments thereafter. The Company is recognizing this expense on a straight-line basis over the 99-year term of the ground and air rights lease, see page 3.

6See page 63 for additional information.

7Represents the net adjustment for above- and below-market leases that are amortized over the terms of the respective leases in place at the property acquisition dates.

8Maintenance capital expenditures do not include capital expenditures that are planned at the time of acquisition or capital expenditures incurred in connection with repositioning activities.

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1For a quantitative reconciliation for the three months ended December 31, 2025, see page 66.

2For a quantitative reconciliation for the three months ended December 31, 2025, see pages 63-64.

3Pages 21-24 indicate by footnote the properties that are not included as part of Same Property NOI. In addition, Same Properties exclude properties that were sold prior to December 31, 2025 and therefore are no longer a part of the Company’s property portfolio.

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1In light of the front-ended, uneven rental payments required by the Company’s 99-year ground and air rights lease for the 100 Clarendon Street garage and Back Bay Transit Station in Boston, MA, and to make period-to-period comparisons more meaningful to investors, the adjustment does not include the straight-line impact of approximately $(3,770) and $146 for the three months ended December 31, 2025 and 2024, respectively. As of December 31, 2025, the Company has remaining lease payments aggregating approximately $25.3 million, all of which it expects to incur by the end of 2027 with no payments thereafter. Under GAAP, the Company recognizes expense of $(111) per quarter on a straight-line basis over the term of the lease. However, unlike more traditional ground and air rights leases, the timing and amounts of the rental payments by the Company correlate to the uneven timing and funding by the Company of capital expenditures related to improvements at Back Bay Transit Station. As a result, the amounts excluded from the adjustment each quarter through 2027 may vary significantly.

2Consists of lease transaction costs that qualify as rent inducements in accordance with GAAP. Lease transaction costs are generally included in 2nd generation tenant improvements and leasing commissions in the Company’s FAD calculation on page 8.

3Pages 21-24 indicate by footnote the properties that are not included as part of Same Property NOI. In addition, Same Properties exclude properties that were sold prior to December 31, 2025 and therefore are no longer a part of the Company’s property portfolio.

4For a quantitative reconciliation for the three months ended December 31, 2025, see page 64.

5For a quantitative reconciliation for the three months ended December 31, 2025, see page 66.

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1Includes 100% share of consolidated joint ventures that are a Same Property.

2See the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

3For a quantitative reconciliation of net income (loss) attributable to BXP, Inc. to net operating income (NOI) (excluding termination income) and NOI - cash (excluding termination income), see pages 9-10.

4Consists of lease transaction costs that qualify as rent inducements in accordance with GAAP. Lease transaction costs are generally included in 2nd generation tenant improvements and leasing commissions in the Company’s FAD calculation on page 8.

5Excludes the straight-line impact of approximately $(3,770) and $146 for the three months ended December 31, 2025 and 2024, respectively, in connection with the Company’s 99-year ground and air rights lease at 100 Clarendon Street garage and Back Bay Transit Station.

6BXP’s Share equals (A) + (B) - (C).

(dollars in thousands, except PSF amounts)

2nd GENERATION TENANT IMPROVEMENTS AND LEASING COMMISSIONS 2

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1See the Definitions and Reconciliations sections of this Supplemental package starting on page 57.

2Includes 100% of unconsolidated joint ventures.

For the period from January 1, 2025 through December 31, 2025

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1The Company has agreed to fund up to $65.0 million in preferred equity. The joint venture has also entered into a $225.0 million construction loan, of which the Company’s share is approximately $43.8 million. As of December 31, 2025, $29.9 million of preferred equity has been contributed and no amounts have been drawn under the construction loan.

2The Company acquired its partner’s 45% ownership interest at cost, resulting in the Company owning 100% of the project. See page 15 for additional details.

3This property is held for future development and therefore, reflected in the Company’s owned land parcels on page 17.

4Excludes approximately $1.7 million of gain related to a sale that occurred in a prior period.

5The Company entered into a joint venture with a third party to redevelop, own and operate 17 Hartwell Avenue. The Company sold 17 Hartwell Avenue to the joint venture for approximately $21.8 million in cash. The Company also contributed development costs of approximately $5.6 million for its 20% ownership interest. The Company will be the development manager for the project. Upon formation of the joint venture, the Company ceased accounting for the property on a consolidated basis and is accounting for the joint venture entity 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 entity. The Company recognized a gain upon sale of the real estate of approximately $18.4 million, as the fair value of the real estate exceeded its carrying value.

CONSTRUCTION IN PROGRESS AT DECEMBER 31, 2025 1