Investor Presentaiton

. OFFICE PROPERTIES INCOME TRUST RELATIONSHIP WITH RMR PROVIDES SCALE AND EFFICIENCY Key Benefits RMR provides all the employees; OPI has no employees. RMR's acquisitions team has visibility to properties marketed for sale across the United States. The depth and breadth of the RMR platform attracts strong real estate professionals. Career advancement opportunities at RMR drives employee engagement and retention. RMR property management employees focus only on assets managed by RMR. RMR platform provides centralized support services, including procurement, banking and capital markets. G&A % of Total Revenue (1) 5.7% 5.3% 4.8% 4.8% 4.4% 9.4% 8.8% 7.8% OPI PDM HIW BXP OFC CIO FSP DEA (1) Source: S&P Global Market Intelligence. Data is for the most recently reported twelve months as of October 31, 2023. 14

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