Exhibit 99.1

FOR IMMEDIATE RELEASE

Diversified Healthcare Trust Updates SHOP Performance

Recovery Continues but at an Uneven Pace

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Newton, MA (May 23, 2023): Diversified Healthcare Trust (Nasdaq: DHC) today provided an update of its Senior Housing Operating Portfolio, or SHOP, performance. DHC believes the SHOP performance comparison of the 2023 periods to the comparable pre-Covid periods in 2019 provides useful information for investors in evaluating the overall recovery in DHC’s performance.

Jennifer Francis, DHC’s President and Chief Executive Officer made the following statement:

“While the SHOP segment performance is generally improving, it remains inconsistent from month-to-month and difficult to predict. With $700 million of debt maturing over the next twelve months and the pace of the SHOP recovery being critical to our ability to refinance this debt, this uncertainty is one of the many reasons why we are confident that the previously announced merger with Office Properties Income Trust is the best path forward for DHC.”

Monthly Unaudited Results in DHC’s Total SHOP Comparable Properties:

Year to Date Unaudited Results in DHC’s Total SHOP Comparable Properties:

Diversified Healthcare Trust(1)

(dollars in thousands, except average monthly rate)

Calculation and Reconciliation of NOI and Comparable Property NOI for SHOP Segment

(dollars in thousands)

About Diversified Healthcare Trust:

DHC is a real estate investment trust focused on owning high-quality healthcare properties located throughout the United States. DHC seeks diversification across the health services spectrum by care delivery and practice type, by scientific research disciplines and by property type and location. As of March 31, 2023, DHC’s approximately $7.1 billion portfolio included 376 properties in 36 states and Washington, D.C., occupied by approximately 500 tenants, and totaling approximately 9 million square feet of life science and medical office properties and more than 27,000 senior living units. DHC is managed by The RMR Group (Nasdaq: RMR), a leading U.S. alternative asset management company with more than $37 billion in assets under management as of March 31, 2023 and more than 35 years of institutional experience in buying, selling, financing and operating commercial real estate. To learn more about DHC, visit www.dhcreit.com.

Warning Concerning Forward-Looking Statements

This press release contains statements that constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other securities laws. Also, whenever DHC uses words such as “believe”, “expect”, “anticipate”, “intend”, “plan”, “estimate”, “will”, “may” and negatives or derivatives of these or similar expressions, it is making forward-looking statements. These forward-looking statements are based upon DHC’s present intent, beliefs or expectations, but forward-looking statements are not guaranteed to occur and may not occur. Actual results may differ materially from those contained in or implied by DHC’s forward-looking statements as a result of various factors. For example: (a) the information regarding DHC’s SHOP segment results provided in this press release reflects certain preliminary estimates based on currently available information, and DHC’s final results upon completion of its quarterly financial close process and review may vary from these preliminary estimates, and as a result, the information provided herein may not provide a meaningful measure of DHC’s SHOP segment results as expected; (b) Ms. Francis's statement regarding improvement in the operating performance of DHC's SHOP communities may imply that the operating performance of these communities will continue to improve; however, the pace of the recovery of DHC’s SHOP segment is inconsistent and difficult to predict and subject to various uncertainties, risks and other factors beyond DHC’s control, such as the continuing impact of the Covid-19 pandemic, as well as the current economic and market conditions, and DHC may not realize continued improvement in its SHOP segment, and the operating performance of DHC’s SHOP communities may decline; and (c) Ms. Francis states in this press release that DHC is confident the merger with Office Properties Income Trust, or OPI, is the best path forward for DHC; however, the closing of the merger is subject to the satisfaction or waiver of closing conditions, and DHC cannot be sure that any or all of these conditions will be satisfied or waived, and accordingly, the merger may not close on the contemplated terms or at all or it may be delayed, and if merger does close, DHC may not realize the benefits from the merger that it currently expects.

The information contained in DHC's filings with the SEC, including under “Risk Factors” in DHC's periodic reports, or incorporated therein, identifies important factors that could cause DHC's actual results to differ materially from those stated in or implied by DHC's forward-looking statements. DHC's filings with the SEC are available on the SEC's website at www.sec.gov.

You should not place undue reliance upon DHC’s forward-looking statements. Except as required by law, DHC does not intend to update or change any forward-looking statements as a result of new information, future events or otherwise.

Important Additional Information About the Merger

In connection with the proposed merger, OPI has filed a registration statement on Form S-4 with the SEC, containing a preliminary prospectus and related materials to register OPI’s common shares of beneficial interest, $.01 par value per share, to be issued in the merger. DHC and OPI intend to file a definitive joint proxy statement/prospectus and other documents concerning the merger with the SEC. The proposed transaction involving DHC and OPI will be submitted to DHC’s and OPI’s shareholders for their consideration. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, INVESTORS ARE URGED TO CAREFULLY READ THE REGISTRATION STATEMENT, THE JOINT PROXY STATEMENT/PROSPECTUS AND ANY OTHER DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC IN CONNECTION WITH THE MERGER OR INCORPORATED BY REFERENCE IN THE REGISTRATION STATEMENT AND JOINT PROXY STATEMENT/PROSPECTUS BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT DHC, OPI AND THE MERGER. When available, the relevant portions of the joint proxy statement/prospectus will be mailed to DHC’s and OPI’s shareholders. Investors will also be able to obtain copies of the registration statement and the joint proxy statement/prospectus and other relevant documents (when they become available) free of charge at the SEC’s website (www.sec.gov). Additional copies of documents filed by DHC with the SEC may be obtained for free on DHC’s Investor Relations website at www.dhcreit.com/investors or by contacting the DHC Investor Relations department at 1-617-796-8234.

In addition to the registration statement and joint proxy statement/prospectus filed or expected to be filed, DHC files annual, quarterly and current reports and other information with the SEC. DHC’s filings with the SEC are also available to the public from commercial document-retrieval services and at the website maintained by the SEC at www.sec.gov.

No Offer or Solicitation

This press release shall not constitute an offer to sell or the solicitation of an offer to subscribe for or buy any securities or a solicitation of any vote or approval in any jurisdiction with respect to the merger or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful, prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended.

Participants in the Solicitation

DHC and certain of its trustees and executive officers, OPI and certain of its trustees and executive officers, and The RMR Group LLC, the manager of DHC and OPI, and its parent and certain of their respective directors, officers and employees may be deemed to be participants in the solicitation of proxies from DHC’s and OPI’s shareholders in connection with the merger. Certain information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of DHC’s and OPI’s shareholders in connection with the merger and a description of their direct and indirect interests are and will be set forth in the registration statement and the joint proxy statement/prospectus when filed with the SEC. Information about DHC’s trustees and executive officers is included in the proxy statement for DHC’s 2023 annual meeting of shareholders, which was filed with the SEC on April 20, 2023. Information about OPI’s trustees and executive officers is included in the proxy statement for OPI’s 2023 annual meeting of shareholders, which was filed with the SEC on April 6, 2023. Copies of the foregoing documents may be obtained as provided above. Additional information regarding the interests of such participants and other persons who may be deemed participants in the transaction will be included in the joint proxy statement/prospectus and the other relevant documents filed with the SEC when they become available.

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