Investor Presentaiton

$4.7 Billion INVESTMENT PORTFOLIO(1) OFFICE PROPERTIES INCOME TRUST OPI AT A GLANCE 154 PROPERTIES IN PORTFOLIO 89.9% REVENUE FROM INVESTMENT OCCUPANCY 64% GRADE TENANTS(2) 20.7 MILLION SQUARE FEET Energy StarⓇ Partner of the Year Office Properties Income Trust (Nasdaq: OPI) is a real estate investment trust (REIT) focused on a diverse portfolio of high-quality office and mixed- use properties in select growth-oriented U.S. markets. In 2023, OPI was named as an Energy Star® Partner of the Year for the sixth consecutive year. vequity (1) Total gross assets. (2) Based on annualized rental income. See Appendix herein for our definition of investment grade tenants. 3

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