Enters into Management Agreement for 8 Communities in Illinois with Cedarhurst Senior Living

New Agreements Now Executed for Approximately 78% of the Transitioning Communities

Diversified Healthcare Trust (Nasdaq: DHC) announced today that it has entered into a new management agreement with Cedarhurst Senior Living for seven assisted living communities and one memory care community within its Senior Housing Operating Portfolio (“SHOP”). All of these communities are located in Illinois and include 486 units. DHC has now entered into new management agreements representing approximately 78% of its SHOP communities to be transitioned from Five Star Senior Living Inc. (Nasdaq: FVE) to other third-party operators as previously announced. DHC continues to expect to complete all of the management transitions at the 108 transitioning communities by year end.

Diversified Healthcare Trust (Nasdaq: DHC) is a real estate investment trust (REIT) 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 June 30, 2021, DHC’s $8.2 billion portfolio included 392 properties in 36 states and Washington, D.C., occupied by almost 600 tenants, and totaling approximately 10.9 million square feet of life science and medical office properties and approximately 28,000 senior living units. DHC is managed by the operating subsidiary of The RMR Group Inc. (Nasdaq: RMR), an alternative asset management company that is headquartered in Newton, MA. To learn more about DHC, visit www.dhcreit.com.

WARNING REGARDING 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, DHC 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. Forward-looking statements involve known and unknown risks, uncertainties and other factors, some of which are beyond DHC's control. For example:

• DHC may be unable to identify additional new operators for the other 24 of 108 senior living communities being transitioned from Five Star that DHC believes are sufficiently qualified or may be unable to reach agreement with any such operators on management terms before year end 2021 or at all, and any agreement DHC may reach with any such operators may not be on the terms DHC currently expects or desires, and may not be equal to or more favorable to DHC than the terms of DHC’s current management arrangements with Five Star.

The information contained in DHC’s filings with the SEC including under “Risk Factors” in DHC’s periodic reports, or incorporated therein, identifies other 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 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.

A Maryland Real Estate Investment Trust with transferable shares of beneficial interest listed on the Nasdaq.

No shareholder, Trustee or officer is personally liable for any act or obligation of the Trust.

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