DIVERSIFIED HEALTHCARE TRUST

We are a real estate investment trust, or REIT, that was organized under Maryland law in 1998. We primarily own senior living communities, medical office and life science properties and other healthcare related properties throughout the United States. As of December 31, 2025, we owned 298 properties, including 13 properties classified as held for sale, located in 33 states and Washington, D.C. As of December 31, 2025, we owned an equity interest in each of two unconsolidated joint ventures that own medical office and life science properties located in five states with an aggregate of approximately 2.2 million rentable square feet that were 99% leased with an average (by annualized rental income) remaining lease term of 14.2 years. Our principal executive offices are located at Two Newton Place, 255 Washington Street, Suite 300, Newton, Massachusetts 02458-1634, and our telephone number is (617) 796-8350. Our Business Strategy The healthcare industry remains one of the most resilient commercial real estate sectors, in part due to the scale of the U.S. healthcare market, which collectively represents approximately 18% of the U.S. gross domestic product, or GDP, according to the Centers for Medicare and Medicaid Services, or CMS. The healthcare sector’s continued expansion has been driven by rising standards of care, increasing life expectancies and other demographic trends, as well as funding from both public and private sources. We believe that the aging of the U.S. population benefits our portfolio of healthcare real estate. According to U.S.