Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934 (Amendment No. )

Your Vote Counts! INVESTOR RELATIONS OFFICE PROPERTIES INCOME TRUST 255 WASHINGTON STREET, SUITE 300 NEWTON, MASSACHUSETTS 02458 OFFICE PROPERTIES INCOME TRUST 2022 Annual Meeting Vote by June 15, 2022 11:59 PM ET You invested in OFFICE PROPERTIES INCOME TRUST and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on June 16, 2022. Vote Virtually at the Meeting* June 16, 2022 9:30 a.m., Eastern time Virtually at: https://www.viewproxy.com/OfficePropertiesIncomeTrust/2022 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number V1 For complete information and to vote, visit www.ProxyVote.com Control # D81251-P69994 Get informed before you vote View the Notice of Annual Meeting, Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 2, 2022. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. Voting Items Board Recommends D81252-P69994 1. Election of Trustees. Nominees (for Independent Trustee): Barbara D. Gilmore John L. Harrington William A. Lamkin Elena B. Poptodorova Nominee (for Managing Trustee): Adam D. Portnoy 2. Advisory vote to approve executive compensation. 3. Ratification of the appointment of Deloitte & Touche LLP as independent auditors to serve for the 2022 fiscal year. For For For For For For For

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