BXP 10-K 2020-12-31

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2020

OR

For the transition period from to

Commission File Number: 1-13087 (Boston Properties, Inc.)

Commission File Number: 0-50209 (Boston Properties Limited Partnership)

BOSTON PROPERTIES, INC.

BOSTON PROPERTIES LIMITED PARTNERSHIP

(Exact name of Registrants as specified in its charter)

Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199-8103

(Address of principal executive offices) (Zip Code)

(617) 236-3300

(Registrants’ telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Boston Properties, Inc.: Yes ☒ No ☐ Boston Properties Limited Partnership: Yes ☒ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Boston Properties, Inc.: Yes ☐ No ☒ Boston Properties Limited Partnership: Yes ☐ No ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Boston Properties, Inc.: Yes ☒ No ☐ Boston Properties Limited Partnership: Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Boston Properties, Inc.: Yes ☒ No ☐ Boston Properties Limited Partnership: Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Boston Properties, Inc.:

Large Accelerated Filer ☒ Accelerated Filer ☐ Non-accelerated Filer ☐ Smaller Reporting Company ☐

Emerging Growth Company ☐

Boston Properties Limited Partnership:

Large Accelerated Filer ☐ Accelerated Filer ☐ Non-accelerated Filer ☒ Smaller Reporting Company ☐

Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards pursuant to Section 13(a) of the Exchange Act.

Boston Properties, Inc. ☐ Boston Properties Limited Partnership ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

Boston Properties, Inc. ☒ Boston Properties Limited Partnership ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

Boston Properties, Inc.: Yes ☐ No ☒ Boston Properties Limited Partnership: Yes ☐ No ☒

As of June 30, 2020, the aggregate market value of the 155,311,291 shares of Common Stock held by non-affiliates of Boston Properties, Inc. was $14,037,034,481 based upon the last reported sale price of $90.38 per share on the New York Stock Exchange on June 30, 2020. (For this computation, Boston Properties, Inc. has excluded the market value of all shares of Common Stock reported as beneficially owned by executive officers and directors of Boston Properties, Inc.; such exclusion shall not be deemed to constitute an admission that any such person is an affiliate of Boston Properties, Inc.).

As of February 22, 2021, there were 155,805,646 shares of Common Stock of Boston Properties, Inc. outstanding.

Because no established market for common units of limited partnership of Boston Properties Limited Partnership exists, there is no market value for such units.

Certain information contained in Boston Properties Inc.’s Proxy Statement relating to its Annual Meeting of Stockholders to be held May 20, 2021 is incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. Boston Properties, Inc. intends to file such Proxy Statement with the Securities and Exchange Commission not later than 120 days after the end of its fiscal year ended December 31, 2020.

EXPLANATORY NOTE

This report combines the Annual Reports on Form 10-K for the fiscal year ended December 31, 2020 of Boston Properties, Inc. and Boston Properties Limited Partnership. Unless stated otherwise or the context otherwise requires, references to “BXP” mean Boston Properties, Inc., a Delaware corporation and real estate investment trust (“REIT”), and references to “BPLP” and the “Operating Partnership” mean Boston Properties Limited Partnership, a Delaware limited partnership. BPLP is the entity through which BXP conducts substantially all of its business and owns, either directly or through subsidiaries, substantially all of its assets. BXP is the sole general partner and also a limited partner of BPLP. As the sole general partner of BPLP, BXP has exclusive control of BPLP’s day-to-day management. Therefore, unless stated otherwise or the context requires, references to the “Company,” “we,” “us” and “our” mean collectively BXP, BPLP and those entities/subsidiaries consolidated by BXP.

As of December 31, 2020, BXP owned an approximate 90.0% ownership interest in BPLP. The remaining approximate 10.0% interest was owned by limited partners. The other limited partners of BPLP are (1) persons who contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP and/or (2) recipients of long-term incentive plan units of BPLP pursuant to BXP’s Stock Option and Incentive Plans. Under the limited partnership agreement of BPLP, unitholders may present their common units of BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of the units that may restrict such right for a period of time, generally one year from issuance). Upon presentation of a common unit for redemption, BPLP must redeem the unit for cash equal to the then value of a share of BXP’s common stock. In lieu of a cash redemption by BPLP, however, BXP may elect to acquire any common units so tendered by issuing shares of BXP common stock in exchange for the common units. If BXP so elects, its common stock will be exchanged for common units on a one-for-one basis. This one-for-one exchange ratio is subject to specified adjustments to prevent dilution. BXP generally expects that it will elect to issue its common stock in connection with each such presentation for redemption rather than having BPLP pay cash. With each such exchange or redemption, BXP’s percentage ownership in BPLP will increase. In addition, whenever BXP issues shares of its common stock other than to acquire common units of BPLP, BXP must contribute any net proceeds it receives to BPLP and BPLP must issue to BXP an equivalent number of common units of BPLP. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT.

The Company believes that combining the Annual Reports on Form 10-K of BXP and BPLP into this single report provides the following benefits:

• enhances investors’ understanding of BXP and BPLP by enabling investors to view the business as a whole in the same manner as management views and operates the business;

• eliminates duplicative disclosure and provides a more concise and readable presentation because a substantial portion of the disclosure applies to both BXP and BPLP; and

• creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.

The Company believes it is important to understand the few differences between BXP and BPLP in the context of how BXP and BPLP operate as a consolidated company. The financial results of BPLP are consolidated into the financial statements of BXP. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving the securities of BXP. BPLP holds substantially all of the assets of BXP, including ownership interests in joint ventures. BPLP conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for the net proceeds from equity offerings by BXP, which are contributed to the capital of BPLP in exchange for common or preferred units of partnership in BPLP, as applicable, BPLP generates all remaining capital required by the Company’s business. These sources include working capital, net cash provided by operating activities, borrowings under its credit facilities, the issuance of secured and unsecured debt and equity securities and proceeds received from the disposition of certain properties and interests in joint ventures.

Shareholders’ equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of BXP and BPLP. The limited partners of BPLP are accounted for as partners’ capital in BPLP’s financial statements and as noncontrolling interests in BXP’s financial statements. The noncontrolling interests in BPLP’s financial statements include the interests of unaffiliated partners in various consolidated partnerships. The noncontrolling interests in BXP’s financial statements include the same

noncontrolling interests at BPLP’s level and limited partners of BPLP. The differences between shareholders’ equity and partners’ capital result from differences in the equity issued at BXP and BPLP levels.

In addition, the consolidated financial statements of BXP and BPLP differ in total real estate assets resulting from previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor redemptions of common units of BPLP. This accounting resulted in a step-up of the real estate assets at BXP. This resulted in a difference between the net real estate of BXP as compared to BPLP of approximately $271.3 million, or 1.5% at December 31, 2020, and a corresponding difference in depreciation expense, impairment losses and gains on sales of real estate upon the sale of certain properties having an allocation of the real estate step-up. The acquisition accounting was nullified on a prospective basis beginning in 2009 as a result of the Company’s adoption of a new accounting standard requiring any future redemptions to be accounted for solely as an equity transaction.

To help investors better understand the key differences between BXP and BPLP, certain information for BXP and BPLP in this report has been separated, as set forth below:

• Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities;

• Item 6. Selected Financial Data;

• Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations includes information specific to each entity, where applicable;

• Item 7. Liquidity and Capital Resources includes separate reconciliations of amounts to each entity’s financial statements, where applicable;

• Item 8. Financial Statements and Supplementary Data which includes the following specific disclosures for BXP and BPLP:

• Note 2. Summary of Significant Accounting Policies;

• Note 3. Real Estate;

• Note 12. Stockholders’ Equity / Partners’ Capital;

• Note 13. Segment Information; and

• Note 14. Earnings Per Share / Common Unit; and

• Item 15. Financial Statement Schedule—Schedule 3.

This report also includes the following separate items for each of BXP and BPLP: Part II, Item 9A. Controls and Procedures, consents of the independent registered public accounting firm (Exhibits 23.1 and 23.2), and certifications (Exhibits 31.1, 31.2, 31.3, 31.4, 32.1, 32.2, 32.3 and 32.4).

TABLE OF CONTENTS

Summary of Risk Factors

The risk factors detailed in Item 1A titled “Risk Factors” in this Annual Report on Form 10-K are the risks that we believe are material to our investors and a reader should carefully consider them. Those risks are not all of the risks we face and other factors not presently known to us or that we currently believe are immaterial may also affect our business if they occur. The following is a summary of the risk factors detailed in Item 1A:

• The COVID-19 pandemic has caused severe disruptions in the United States and global economies and we expect it will continue to materially and adversely affect our financial condition, results of operations, cash flows, liquidity and performance and that of our tenants.

• Our performance depends upon the economic climates of our markets—Boston, Los Angeles, New York, San Francisco and Washington, DC.

• Adverse economic and geopolitical conditions, health crises and dislocations in the credit markets could have a material adverse effect on our results of operations, financial condition and ability to pay dividends and/or distributions.

• Our success depends on key personnel whose continued service is not guaranteed.

• Our performance and value are subject to risks associated with our real estate assets and with the real estate industry, including, without limitation:

◦potential difficulties or delays renewing leases or re-leasing space; and

◦potential adverse effects from major tenants’ bankruptcies or insolvencies.

• Our actual costs to develop properties may exceed our budgeted costs.

• Our use of joint ventures may limit our flexibility with respect to the assets they own and other assets we may wish to acquire.

• Some potential losses are not covered by insurance.

• We face risks associated with the physical effects of climate change.

• Potential liability for environmental contamination could result in substantial costs.

• An increase in interest rates would increase our interest costs on variable rate debt and could adversely impact our ability to re-finance existing debt or sell assets on favorable terms or at all.

• Covenants in our debt agreements could adversely affect our financial condition.

• We face risks associated with the use of debt to fund acquisitions and developments, including refinancing risk.

• Our degree of leverage could limit our ability to obtain additional financing or affect the market price of our equity and debt securities.

• We face risks associated with BXP’s status as a real estate investment trust (REIT), including, without limitation:

◦failure to qualify as a REIT would cause BXP to be taxed as a corporation, which would substantially reduce funds available for payment of dividends;

◦possible adverse state and local tax audits and changes in state and local tax laws could result in increased tax costs that could adversely affect our financial condition and results of operations and the amount of cash available for the payment of dividends and distributions to our securityholders; and

◦in order to maintain BXP’s REIT status, we may be forced to borrow funds during unfavorable market conditions.

• Litigation could have a material adverse effect.

• We face risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems.

• Changes in accounting pronouncements could adversely affect our operating results, in addition to the reported financial performance of our tenants.

This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 57.

PART I

General

BXP, a Delaware corporation organized in 1997, is a fully integrated, self-administered and self-managed REIT, and is one of the largest publicly-traded office REITs (based on total market capitalization as of December 31, 2020) in the United States that develops, owns and manages primarily Class A office properties.

Our properties are concentrated in five markets—Boston, Los Angeles, New York, San Francisco and Washington, DC. At December 31, 2020, we owned or had joint venture interests in a portfolio of 196 commercial real estate properties, aggregating approximately 51.2 million net rentable square feet of primarily Class A office properties, including six properties under construction/redevelopment totaling approximately 3.7 million net rentable square feet. As of December 31, 2020, our properties consisted of:

• 177 office properties (including six properties under construction/redevelopment);

• 12 retail properties;

• six residential properties; and

• one hotel.

We consider Class A office properties to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and professionally managed and maintained. As such, these properties attract high-quality tenants and command upper-tier rental rates. Our definition of Class A office properties may be different than those used by other companies.

We are a full-service real estate company, with substantial in-house expertise and resources in acquisitions, development, financing, capital markets, construction management, property management, marketing, leasing, accounting, risk management, tax and legal services. BXP manages BPLP as its sole general partner. Our principal executive office and Boston regional office are located at The Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199 and our telephone number is (617) 236-3300. In addition, we have regional offices at 3250 Ocean Park Boulevard, Suite 300, Santa Monica, California 90405, 599 Lexington Avenue, New York, New York 10022, Four Embarcadero Center, San Francisco, California 94111 and 2200 Pennsylvania Avenue NW, Washington, DC 20037.

Our internet address is http://www.bxp.com. On our website, you can obtain free copies of our Annual Reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission, or the SEC. You may also obtain BXP’s and BPLP’s reports by accessing the EDGAR database at the SEC’s website at http://www.sec.gov, or we will furnish an electronic or paper copy of these reports free of charge upon written request to: Investor Relations, Boston Properties, Inc., Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199. “Boston Properties” is a registered trademark and the “bxp” logo is a trademark, in both cases, owned by BPLP.

Boston Properties Limited Partnership

BPLP is a Delaware limited partnership organized in 1997, and the entity through which BXP conducts substantially all of its business and owns, either directly or through subsidiaries, substantially all of its assets. BXP is the sole general partner of BPLP and, as of February 22, 2021, the owner of approximately 89.8% of the economic interests in BPLP. Economic interest was calculated as the number of common partnership units of BPLP owned by BXP as a percentage of the sum of (1) the actual aggregate number of outstanding common partnership units of BPLP and (2) the number of common units issuable upon conversion of all outstanding long term incentive plan units of BPLP, or LTIP Units, for which all performance conditions have been satisfied for such conversion. We exclude from (1) and (2) above other LTIP Units issued in the form of Multi-Year Long-Term Incentive Plan Awards in 2019 or later (“MYLTIP Awards”), which remain subject to performance conditions. An LTIP Unit is generally the economic equivalent of a share of BXP’s restricted common stock, although LTIP Units issued in the form of MYLTIP Awards are only entitled to receive one-tenth (1/10th) of the regular quarterly distributions (and no special distributions) prior to being earned.

Preferred units of BPLP have the rights, preferences and other privileges set forth in an amendment to the limited partnership agreement of BPLP. As of December 31, 2020 and February 22, 2021, BPLP had one series of

Preferred Units outstanding consisting of 80,000 Series B Preferred Units. The Series B Preferred Units have a liquidation preference of $2,500 per share (or an aggregate of approximately $193.6 million at December 31, 2020 and February 22, 2021, after deducting the underwriting discount and transaction expenses). The Series B Preferred Units were issued by BPLP on March 27, 2013 in connection with BXP’s issuance of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of 5.25% Series B Cumulative Redeemable Preferred Stock (the “Series B Preferred Stock”). BXP contributed the net proceeds from the offering to BPLP in exchange for Series B Preferred Units having rights, performance and privileges generally mirroring those of the Series B Preferred Stock. BXP will pay cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500 liquidation preference per share. On and after March 27, 2018, BXP, at its option, may redeem the Series B Preferred Stock for a cash redemption price of $2,500 per share, plus all accrued and unpaid dividends. The Series B Preferred Stock is not redeemable by the holders, has no maturity date and is not convertible into any other security of ours or our affiliates.

Transactions During 2020

Dispositions

For information explaining why BXP and BPLP may report different gains on sales of real estate, see the Explanatory Note that follows the cover page of this Annual Report on Form 10-K.

On January 28, 2020, we entered into a joint venture with a third party to own, operate and develop properties at our Gateway Commons complex located in South San Francisco, California. We contributed our 601, 611 and 651 Gateway properties and development rights with an agreed upon value aggregating approximately $350.0 million for our 50% interest in the joint venture. 601, 611 and 651 Gateway consist of three Class A office properties aggregating approximately 768,000 net rentable square feet. The partner contributed three properties and development rights with an agreed upon value aggregating approximately $280.8 million at closing and will contribute cash totaling approximately $69.2 million in the future for its 50% ownership interest in the joint venture. As a result of the partner’s deferred contribution, we have an initial approximately 55% interest in the joint venture. Future development projects will be owned 49% by us and 51% by our partner. Upon the partner’s contribution, we ceased accounting for the joint venture entity on a consolidated basis and are accounting for the joint venture entity on an unconsolidated basis using the equity method of accounting, as we have reduced our ownership interest in the joint venture entity and no longer have a controlling financial or operating interest in the joint venture entity (See Note 6). We recognized a gain on the retained and sold interest in the real estate contributed to the joint venture totaling approximately $217.7 million for BXP and $222.4 million for BPLP during the year ended December 31, 2020 within Gains on Sales of Real Estate on the respective Consolidated Statements of Operations, as the fair value of the real estate exceeded its carrying value (See “Investments in Unconsolidated Joint Ventures” below).

On February 20, 2020, we completed the sal

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Set forth below are the risks that we believe are material to our investors and they should be carefully considered. Throughout this section, we refer to the equity and debt securities of both BXP and BPLP as our “securities,” and the investors who own securities of BXP, BPLP or both, as our “securityholders.” These risks are not all of the risks we face and other factors not presently known to us or that we currently believe are immaterial may also affect our business if they occur. This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 57.

Risks Related to Our Business and Operations

The COVID-19 pandemic has caused severe disruptions in the United States and global economies and we expect it will continue to materially and adversely affect our financial condition, results of operations, cash flows, liquidity and performance and that of our tenants.

The global impact of the COVID-19 pandemic continues to evolve and public health officials and governmental authorities, including those in all of the markets in which we operate, continue to implement measures restricting travel, issuing “stay-at-home” orders, restricting the types of businesses that may continue to operate (including the types of construction projects that may proceed) and the capacity at which businesses may operate. Most of these restrictions began in earnest in March 2020 and they quickly had a material adverse impact on economic and market conditions around the world, including the United States and the markets in which our properties are located, and on us. It is likely that the restrictions and measures of public health officials and governmental authorities will continue through the end of 2021 and possibly longer. There remains uncertainty regarding the duration and breadth of the COVID-19 pandemic. The degree to which the COVID-19 pandemic will continue to adversely impact our business, financial condition, results of operation, cash flows, liquidity and performance, and that of our tenants, will be driven primarily by the speed, effectiveness and distribution of vaccines, the duration of indirect economic impacts such as recession, dislocation in capital markets, and job loss, potential longer term changes in consumer and tenant behavior, as well as possible future governmental responses, which makes it impossible for us to predict with certainty the overall impact that COVID-19 will have on us and our tenants at this time. Factors related to COVID-19 that have had, or could have, a material adverse effect on our results of operations and financial condition, include:

• a complete or partial closure of, or other operational issues at, one or more of our properties resulting from government or tenant action, including delays in re-opening or subsequent closures of previously re-opened properties, which could adversely affect our operations and those of our tenants;

• reduced economic activity impacting the businesses, financial condition and liquidity of our tenants has caused, and is expected to continue to cause, one or more of our tenants to be unable to meet their obligations to us, including their ability to make rental payments, in full or at all, or to otherwise seek modifications of such obligations, including rent concessions, deferrals or abatements, or to declare bankruptcy;

• the failure of our tenants to properly implement or deploy their business continuity plans, or if those plans are ineffective, could have a material adverse effect on our tenants’ businesses and their ability to pay rent;

• the impact of new or continued complete or partial shutdowns of the operations of one or more of our tenants’ businesses, including office, life sciences, hotel and retail tenants, and parking operators, temporary or long-term disruptions in our tenants’ supply chains from local, national and international suppliers or delays in the delivery of products, services or other materials necessary for our tenants’ operations, could force our tenants to reduce, delay or eliminate offerings of their products and services, which could result in less revenue, income and cash flow, and possibly their bankruptcy or insolvency, which in turn could:

• reduce our cash flows,

• adversely impact our ability to finance, refinance or sell a property,

• adversely impact our ability to continue paying dividends to our stockholders at current levels, or at all, and

• result in additional legal and other costs to enforce our rights, collect rent and/or re-lease the space occupied by the distressed tenant;

• the duration and scope of the mandatory business closures and “stay-at-home” orders have had, and are expected to continue to have, a severe negative impact on our retail, fitness and entertainment tenants that depend on in-person interactions with their customers to generate revenues and have resulted, and are expected to continue to result, in most retail, fitness and entertainment tenants being unable to make timely rental payments in full or at all;

• the extent to which COVID-19 decreases customers’ willingness to frequent, or prevents customers from frequenting, our tenants’ businesses in the future, may result in our retail tenants’ continued inability to make timely rental payments to us under their leases;

• many of our retail and select office tenants have approached us seeking either rent concessions, deferrals or abatements, and the extent to which we grant these requests or instead seek to enforce our legal remedies could have a material adverse effect on our results of operations, liquidity and cash flows;

• the degree to which our tenants’ businesses have been, and continue to be, negatively impacted has required, and may continue to require, us to write-off a tenant’s accrued rent balance and this could have a material adverse effect on our results of operations and liquidity;

• if new or existing actions or measures implemented to prevent the spread of COVID-19 continue to result in increasing unemployment, it may negatively affect the leasing of residential units as well as the ability of our existing residential tenants to generate sufficient income to pay, or make them unwilling to pay rent, in full or at all, in a timely manner;

• the impact of prolonged restrictions on freedom of movement and business operations, such as travel bans, business closures and “stay-at-home” orders have had, and are expected to continue to have, a material adverse effect on the operators of our parking garages and our hotel property, which negatively impacts our revenues and may also result in a decrease in demand for hotel stays even after the travel bans and other restrictions are lifted;

• our failure, or the failure of any of our joint venture partners, to meet our or their, as applicable, responsibilities or obligations to the other or to third parties, such as lenders, including a failure to contribute additional capital needed by the ventures or a default by a party under a joint venture agreement or other agreement relating to a joint venture, each of which, in our case, could result in dilution of our interest or a loss of our management and other rights relating to our joint ventures, and in the case of a joint venture partner, could result in our payment of the partner’s share of the additional capital;

• the impact of COVID-19 could result in an event or change in circumstances that results in an impairment in the value of our properties or our investments in unconsolidated joint ventures, and any such impairment could have a material adverse effect on our results of operations in the periods in which the charge is taken;

• we may be unable to restructure or amend leases with certain of our tenants on terms favorable to us or at all;

• the impact and validity of interpretations of lease provisions and applicable laws related to claim

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None.

At December 31, 2020, we owned or had joint venture interests in 196 commercial real estate properties, aggregating approximately 51.2 million net rentable square feet of primarily Class A office properties, including six properties under construction/redevelopment totaling approximately 3.7 million net rentable square feet. Our properties consisted of (1) 177 office properties (including six properties under construction/redevelopment), (2) 12 retail properties, (3) six residential properties and (4) one hotel. The table set forth below shows information relating to the properties we owned, or in which we had an ownership interest, at December 31, 2020, and it includes properties held by both consolidated and unconsolidated joint ventures.

(1)Represents signed leases for in-service properties which revenue recognition has commenced in accordance with accounting principles generally accepted in the United States (“GAAP”).

(2)Excludes the portion that was removed from the in-service portfolio during the third quarter of 2016 as part of a planned redevelopment.

(3)Property is an unconsolidated joint venture.

(4)As a result of the partner’s deferred contribution, we own an approximately 55% interest in the joint venture at December 31, 2020. Future development projects will be owned 49% by us and 51% by our partner.

(5)Property is held for redevelopment.

(6)Excludes the portion that was removed from the in-service portfolio during the third quarter of 2019 as part of a planned redevelopment.

(7)Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020.

(8)This property is subject to a 99-year ground lease (including extension options) with an option to purchase in the future.

(9)This property was completed and fully placed in-service on August 15, 2020 and is in its initial lease-up period. Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020.

(10)This property was completed and fully placed in-service on July 24, 2020 and is in its initial lease-up period. Percentage leased is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020.

(11)Includes 87,690 square feet of retail space which is approximately 57.4% leased as of December 31, 2020. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020.

(12)Represents the weighted-average room occupancy for the year ended December 31, 2020. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020. As a result of COVID-19, the Boston Marriott Cambridge was closed in March 2020 and did not re-open until October 2, 2020 with limited occupancy.

(13)Includes 4,260 square feet of retail space which is 100% leased as of December 31, 2020. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2020.

(14)Represents percentage leased as of February 22, 2021, including leases with future commencement dates.

(15)The low-rise portion of 601 Lexington Avenue.

(16)Represents a portion of the property under redevelopment for conversion to life sciences space.

Percentage Leased and Average Annualized Revenue per Square Foot for In-Service Properties

The following table sets forth our percentage leased and average annualized revenue per square foot on a historical basis for our In-Service Properties.

(1)Represents signed leases, excluding hotel and residential properties, for which revenue recognition has commenced in accordance with GAAP.

(2)Represents the monthly contractual base rents and recoveries from tenants under existing leases as of December 31, 2020, 2019, 2018, 2017 and 2016 multiplied by twelve. These annualized amounts are before rent abatements and include expense reimbursements, which may be estimates as of such date. The aggregate amounts of rent abatements per square foot under existing leases as of December 31, 2020, 2019, 2018, 2017 and 2016 for the succeeding twelve-month period were $1.73, $1.70, $0.97, $1.67 and $1.18, respectively.

Top 20 Tenants by Square Feet

Our 20 largest tenants by square feet as of December 31, 2020 were as follows:

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(1)Amounts are calculated based on our consolidated portfolio square feet, plus our share of the square feet from the unconsolidated joint ventures properties (calculated based on our ownership percentage), minus our partners’ share of square feet from our consolidated joint venture properties (calculated based upon the partners’ percentage ownership interests).

Tenant Diversification

Our tenant diversification by square feet as of December 31, 2020 was as follows: