Investor Presentaiton

OFFICE PROPERTIES INCOME TRUST RECONCILIATION AND CALCULATION OF SAME PROPERTY NOI AND SAME PROPERTY CASH BASIS NOI (dollars in thousands) Reconciliation of NOI to Same Property NOI: Rental income Property operating expenses ΝΟΙ Less: NOI of properties not included in same property results Same Property NOI Calculation of Same Property Cash Basis NOI: For the Three Months Ended 9/30/2023 9/30/2022 For the Nine Months Ended 9/30/2023 9/30/2022 $ 133,361 $ 137,683 $ 399,780 426,353 (49,663) (52,137) (146,590) (151,910) 83,698 85,546 253,190 274,443 (901) (2,556) (801) (17,382) 82,797 $ 82,990 $ 252,389 $ 257,061 Same Property NOI 82,797 $ 82,990 $ 252,389 $ 257,061 Add: Lease value amortization included in rental income (56) 176 (204) 624 Less: Non-cash straight line rent adjustments included in rental income (7,426) (1,845) (15,956) (7,535) Lease termination fees included in rental income (1,576) (83) (3,160) (3,465) Non-cash amortization included in property operating expenses (1) (109) (108) (325) (309) Same Property Cash Basis NOI $ 73,630 $ 81,130 $ 232,744 $ 246,376 (1) OPI recorded a liability for the amount by which the estimated fair value for accounting purposes exceeded the price OPI paid for its former investment in RMR Inc. common stock in June 2015. A portion of this liability is being amortized on a straight line basis through December 31, 2035 as a reduction to property management fees expense, which is included in other operating expenses. 20

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