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Securities Exchange Act of 1934 (Amendment No.     )


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Diversified Healthcare Trust


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Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on May 19, 2020. DIVERSIFIED HEALTHCARE TRUST * As part of our precautions regarding the coronavirus or COVID-19, we are planning for the possibility that the annual meeting may be held virtually solely by means of remote communication or via a live webcast. If we take this step, we will announce the decision to do so in advance, and we will provide details on how to participate in a press release and on our website at www.dhcreit.com. Please retain a copy of the control number from the proxy card, in the event that the meeting is held by remote communication or live webcast. You are receiving this communication because you hold shares in the company named above as of the record date noted above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet or by mail. We encourage you to access and review all of the important information contained in the proxy materials before voting. DIVERSIFIED HEALTHCARE TRUST C/O BROADRIDGE FINANCIAL SOLUTIONS, INC. P.O. BOX 1342 BRENTWOOD, NY 11717 proxy materials and voting instructions. D04900-P36559 See the reverse side of this notice to obtain NOTICE OF ANNUAL MEETING OF SHAREHOLDERS Meeting Information Meeting Type:Annual For holders as of:March 16, 2020 Date: May 19, 2020Time: 9:30 a.m., Eastern time Location: Diversified Healthcare Trust Two Newton Place 255 Washington Street, Suite 100 Newton, MA 02458*


Before You Vote How to Access the Proxy Materials Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the D04901-P36559 Vote in Person: Shareholders of record of the company as of March 16, 2020, or their duly authorized proxies, are entitled to vote in person at the meeting.At the meeting, you will need to request a ballot to vote these shares. To obtain directions to the location of the annual meeting of shareholders, please call 617-796-8234. Authorize Your Proxy by Internet: To authorize a proxy to submit your vote now by Internet, go to www.proxyvote.com. following page) available and follow the instructions. Authorize Your Proxy by Telephone or by Mail: You can authorize a proxy to submit your vote by telephone or by mail by requesting a paper copy of the materials, which will include a proxy card with instructions. The Notice of Annual Meeting, Proxy Statement and Annual Report are available at www.proxyvote.com. How to View Online: following page) and visit: www.proxyvote.com. If you want to receive a paper or email copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed below on or before May 5, 2020, to facilitate timely delivery. How to Request and Receive a PAPER or EMAIL Copy for the 2020 Annual Meeting of Shareholders and for Shareholder Meetings in the Future: 1) BY INTERNET:www.proxyvote.com 2) BY TELEPHONE:1-800-579-1639 3) BY EMAIL*:sendmaterial@proxyvote.com * If requesting materials by email, please send a blank email with the information that is printed in the box marked Requests, instructions and other inquiries sent to this email address will NOT be forwarded to your investment advisor.


The Board of Trustees Recommends a Vote FOR the Nominee for Trustee in Proposal 1 and FOR Proposal 2, 3 and 4. 1. Election of Trustee. Nominee (for Independent Trustee in Class III): Jeffrey P. Somers 2. Approve an amendment to the Company's Declaration of Trust to provide for the annual election of all Trustees. 3. Advisory vote to approve executive compensation. 4. Ratification of the appointment of Ernst & Young LLP as independent auditors to serve for the 2020 fiscal year. D04902-P36559 Voting Items