Office Properties Income Trust (OPI) 8-K Office Properties Income Trust Announces Entry into Private Exchange Agreement with Certain Noteholders to Address 2025 Debt Maturities

Exhibit 99.3

Final Term Sheet 11.5.24 Office Properties Income Trust Liquidity and covenant information OPI October 31st Proposal ‐ Upside (1) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Beginning Cash 13,498 $ $ 37,598 $ 155,072 $ 125,717 $ 122,487 $ 83,656 $ 90,221 $ 70,638 $ (29,464) $ (58,638) Cash flows from operations, net (30,752) 18,088 (25,780) 3,270 (32,331) 13,065 (19,957) 10,892 (22,674) 31,640 Proceeds from sales of properties 45,152 139,329 44,412 ‐ 99,612 ‐ 6,874 ‐ 17,672 ‐ Cash flows from financing, net 9,700 (39,943) (47,987) (106,112) (6,500) (6,500) (6,500) (128,666) (6,500) (6,500) Ending Cash 37,598 $ $ 155,072 $ 125,717 $ 122,487 $ 83,656 $ 90,221 $ 70,638 $ (29,464) $ (58,638) $ (33,498) Repayment of New Secured Notes $ ‐ ‐ $ $ (47,987) $ (106,112) $ (6,500) $ (6,500) $ (6,500) $ (23,300) $ (6,500) $ (6,500) Cumulative Secured Notes Repaid $ ‐ ‐ $ $ (47,987) $ (154,099) $ (160,599) $ (167,099) $ (173,599) $ (196,899) $ (203,399) $ (209,899) Proceeds from sales of unsecured properties $ ‐ $ 139,329 $ ‐ 2,925 $ ‐ $ ‐ $ $ 6,874 $ ‐ 17,672 $ ‐ $ Aggregate proceeds from sales of unsecured proerties $ ‐ $ 139,329 $ 142,254 $ 142,254 $ 142,254 $ 142,254 $ 149,128 $ 166,800 $ 166,800 $ 166,800 Proceeds in excess of $150M cap to repay secured notes $ ‐ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ $ (16,800) $ (16,800) $ (16,800) OPI October 31st Proposal ‐ Base Case (2) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Beginning Cash 13,498 $ $ 37,598 $ 120,240 $ 87,960 $ 84,663 $ 45,564 $ 51,860 $ 13,445 $ (74,405) $ (103,847) Cash flow from operations, net (30,752) 18,088 (25,780) 3,204 (32,600) 12,796 (20,088) 10,761 (22,941) 31,373 Proceeds from sales of properties 45,152 104,497 33,309 ‐ 74,709 ‐ 5,156 ‐ 13,254 ‐ Cash flows from financing, net 9,700 (39,943) (39,809) (81,209) (6,500) (6,500) (23,482) (111,866) (6,500) (15,350) Ending Cash 37,598 $ $ 120,240 $ 87,960 $ 84,663 $ 45,564 $ 51,860 $ 13,445 $ (74,405) $ (103,847) $ (87,824) Repayment of New Secured Notes $ ‐ ‐ $ $ (39,809) $ (81,209) $ (6,500) $ (6,500) $ (23,482) $ (6,500) $ (6,500) $ (6,500) Cumulative Secured Notes Repaid $ ‐ ‐ $ $ (39,809) $ (121,018) $ (127,518) $ (134,018) $ (157,500) $ (164,000) $ (170,500) $ (177,000) Proceeds from sales of unsecured properties $ ‐ $ 104,497 $ ‐ 2,194 $ ‐ $ ‐ $ $ 5,156 $ ‐ 13,254 $ ‐ $ Aggregate proceeds from sales of unsecured proerties $ ‐ $ 104,497 $ 106,691 $ 106,691 $ 106,691 $ 106,691 $ 111,846 $ 125,100 $ 125,100 $ 125,100 Proceeds in excess of $150M cap to repay secured notes $ ‐ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ OPI October 31st Proposal ‐ Downside (3) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Beginning Cash 13,498 $ $ 37,598 $ 85,408 $ 53,128 $ 49,674 $ 10,013 $ 15,748 $ (60,521) $ (152,921) $ (182,630) Cash flow from operations, net (30,752) 18,088 (25,780) 3,047 (33,161) 12,235 (20,219) 10,630 (23,209) 31,105 Proceeds from sales of properties 45,152 69,665 22,206 ‐ 49,806 ‐ 3,437 ‐ 8,836 ‐ Cash flows from financing, net 9,700 (39,943) (28,706) (56,306) (6,500) (6,500) (59,488) (111,866) (6,500) (15,350) Ending Cash 37,598 $ $ 85,408 $ 53,128 $ 49,674 $ 10,013 $ 15,748 $ (60,521) $ (152,921) $ (182,630) $ (166,874) Repayment of New Secured Notes $ ‐ ‐ $ $ (28,706) $ (56,306) $ (6,500) $ (6,500) $ (59,488) $ (6,500) $ (6,500) $ (6,500) Cumulative Secured Notes Repaid $ ‐ ‐ $ $ (28,706) $ (85,012) $ (91,512) $ (98,012) $ (157,500) $ (164,000) $ (170,500) $ (177,000) Proceeds from sales of unsecured properties $ ‐ $ 69,665 $ ‐ 1,463 $ ‐ $ ‐ $ $ 3,437 $ ‐ 8,836 $ ‐ $ Aggregate proceeds from sales of unsecured proerties $ ‐ $ 69,665 $ 71,127 $ 71,127 $ 71,127 $ 71,127 $ 74,564 $ 83,400 $ 83,400 $ 83,400 Proceeds in excess of $150M cap to repay secured notes $ ‐ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ ‐ $ (1) Assumes 100% of modeled dispositions transact at estimated sales prices. (2) Assumes 75% of disposition proceeds realized. (3) Assumes 50% of disposition proceeds realized.

Final Term Sheet 11.5.24 Office Properties Income Trust Liquidity and covenant information OPI October 31st Proposal ‐ Upside (1) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Total Adjusted Total Assets 5,256,650 $ $ 4,919,555 $ 4,782,551 $ 4,438,601 $ 4,445,298 $ 4,461,435 $ 4,344,996 $ 4,277,074 $ 4,292,390 Less: Dispositions (342,447) (139,932) ‐ (348,059) ‐ (21,530) ‐ (80,051) ‐ Net Adjusted Total Assets 5,171,636 $ $ 4,914,203 $ 4,779,623 $ 4,434,492 $ 4,438,601 $ 4,445,298 $ 4,439,906 $ 4,264,944 $ 4,277,074 $ 4,292,390 Less: Encumbered Assets (2,756,946) (4,056,395) (3,950,074) (3,618,664) (3,641,992) (3,655,300) (3,670,839) (3,691,477) (3,707,998) (3,714,098) Total Unencumbered Adjusted Total Assets 2,414,690 $ $ 857,808 $ 829,549 $ 815,828 $ 796,609 $ 789,998 $ 769,067 $ 573,467 $ 569,076 $ 578,292 Total Unsecured Debt 988,481 $ $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 357,139 $ 357,139 $ 357,139 Unencumbered Assets / Unsecured Debt Maintenance Covenant (Minimum 150%) 244.3% 172.4% 166.7% 163.9% 160.1% 158.8% 154.5% 160.6% 159.3% 161.9% Consolidated income available for debt service 293,490 $ $ 283,917 $ 262,665 $ 253,750 $ 247,927 $ 244,808 $ 242,955 $ 243,153 $ 246,829 $ 250,932 Less: Dispositions (22,419) (28,513) (16,487) (19,240) (11,199) (5,996) (1,219) 2,476 1,771 1,106 Net Consolidated income available for debt service (CIADS) 271,071 $ $ 255,404 $ 246,178 $ 234,510 $ 236,728 $ 238,812 $ 241,736 $ 245,629 $ 248,600 $ 252,038 CIADS / Debt Service incurrence test (Minimum 1.50x) 1.67x 1.62x 1.55x 1.50x 1.50x 1.53x 1.57x 1.65x 1.67x 1.63x OPI October 31st Proposal ‐ Base Case (2) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Total Adjusted Total Assets 5,221,818 $ $ 4,881,798 $ 4,744,727 $ 4,400,509 $ 4,406,937 $ 4,404,243 $ 4,300,054 $ 4,231,866 $ 4,238,064 Less: Dispositions (342,447) (139,932) ‐ (348,059) ‐ (21,530) ‐ (80,051) ‐ Net Adjusted Total Assets 5,171,636 $ $ 4,879,371 $ 4,741,866 $ 4,396,668 $ 4,400,509 $ 4,406,937 $ 4,382,713 $ 4,220,003 $ 4,231,866 $ 4,238,064 Less: Encumbered Assets (2,756,946) (4,056,395) (3,950,074) (3,618,664) (3,641,992) (3,655,300) (3,670,839) (3,691,477) (3,707,998) (3,714,098) Total Unencumbered Adjusted Total Assets 2,414,690 $ $ 822,976 $ 791,792 $ 778,004 $ 758,517 $ 751,637 $ 711,874 $ 528,526 $ 523,868 $ 523,966 Total Unsecured Debt 988,481 $ $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 357,139 $ 357,139 $ 357,139 Unencumbered Assets / Unsecured Debt Maintenance Covenant (Minimum 150%) 244.3% 165.4% 159.1% 156.3% 152.4% 151.0% 143.1% 148.0% 146.7% 146.7% Consolidated income available for debt service 293,490 $ $ 283,917 $ 262,665 $ 253,750 $ 247,927 $ 244,808 $ 242,955 $ 243,153 $ 246,829 $ 250,932 Less: Dispositions (22,419) (28,513) (16,487) (19,240) (11,199) (5,996) (1,219) 2,476 1,771 1,106 Net Consolidated income available for debt service (CIADS) 271,071 $ $ 255,404 $ 246,178 $ 234,510 $ 236,728 $ 238,812 $ 241,736 $ 245,629 $ 248,600 $ 252,038 CIADS / Debt Service incurrence test (Minimum 1.50x) 1.67x 1.62x 1.55x 1.49x 1.49x 1.52x 1.57x 1.64x 1.66x 1.62x OPI October 31st Proposal ‐ Downside (3) Q3‐24 Q4‐24 Q1‐25 Q2‐25 Q3‐25 Q4‐25 Q1‐26 Q2‐26 Q3‐26 Q4‐26 Total Adjusted Total Assets 5,186,986 $ $ 4,846,966 $ 4,709,738 $ 4,364,958 $ 4,370,825 $ 4,330,276 $ 4,221,539 $ 4,153,083 $ 4,159,014 Less: Dispositions (342,447) (139,932) ‐ (348,059) ‐ (21,530) ‐ (80,051) ‐ Net Adjusted Total Assets 5,171,636 $ $ 4,844,539 $ 4,707,034 $ 4,361,680 $ 4,364,958 $ 4,370,825 $ 4,308,746 $ 4,141,487 $ 4,153,083 $ 4,159,014 Less: Encumbered Assets (2,756,946) (4,056,395) (3,950,074) (3,618,664) (3,641,992) (3,655,300) (3,670,839) (3,691,477) (3,707,998) (3,714,098) Total Unencumbered Adjusted Total Assets 2,414,690 $ $ 788,144 $ 756,960 $ 743,016 $ 722,966 $ 715,525 $ 637,907 $ 450,010 $ 445,085 $ 444,916 Total Unsecured Debt 988,481 $ $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 497,627 $ 357,139 $ 357,139 $ 357,139 Unencumbered Assets / Unsecured Debt Maintenance Covenant (Minimum 150%) 244.3% 158.4% 152.1% 149.3% 145.3% 143.8% 128.2% 126.0% 124.6% 124.6% Consolidated income available for debt service 293,490 $ $ 283,917 $ 262,665 $ 253,750 $ 247,927 $ 244,808 $ 242,955 $ 243,153 $ 246,829 $ 250,932 Less: Dispositions (22,419) (28,513) (16,487) (19,240) (11,199) (5,996) (1,219) 2,476 1,771 1,106 Net Consolidated income available for debt service (CIADS) 271,071 $ $ 255,404 $ 246,178 $ 234,510 $ 236,728 $ 238,812 $ 241,736 $ 245,629 $ 248,600 $ 252,038 CIADS / Debt Service incurrence test (Minimum 1.50x) 1.67x 1.62x 1.55x 1.49x 1.48x 1.51x 1.57x 1.64x 1.66x 1.62x (1) Assumes 100% of modeled dispositions transact at estimated sales prices. (2) Assumes 75% of disposition proceeds realized. (3) Assumes 50% of disposition proceeds realized.