Investor Presentaiton

(2) €2 (1) $550M Available Revolving Credit Facility (1) 8.1x Net Debt to Rolling Four Quarter Adjusted EBITDAre Unsecured 93.2% OFFICE PROPERTIES INCOME TRUST FOCUSED ON MANAGING DEBT MATURITIES Liquidity & Debt Metrics 2023 Mortgage Activity $24M Cash on Hand 4.4% Weighted Average Interest Rate on Debt 2.7x Adjusted EBITDAre to 4.4% Interest Expense Secured Debt to Total Assets Secured 6.8% Debt Profile Fixed Rate 92.3% • Executed efficient CMBS financing amid challenging capital • market conditions. Closed more than $177 million in interest-only mortgage financing. 7.8% weighted average interest rate. 6.4 year weighted average term. 6.9% implied capitalization rate. 51% loan to value Used net proceeds to repay amounts outstanding under revolving credit facility and fund development projects. Debt Maturities Variable Rate 7.7% ($ in Millions) $650 $550 Availability under OPI's revolving credit facility is subject to meeting required financial covenants. 2024 debt maturities include $200 million outstanding on OPI's revolving credit facility. $350 $300 $739 $- (2) 2023 2024 2025 2026 2027 2028+ % Total Debt - % 21% 25% 12% 14% 28% 9

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