Exhibit 21 Subsidiaries of the Registrant Subsidiary* State of Incorporation HR of Texas, Inc. Maryland HRT of Alabama, Inc. Alabama HRT of Tennessee, Inc. Tennessee HRT of Virginia, Inc. Virginia HRT of Arkansas, Inc. (Inactive) Arkansas Healthcare Realty Management Incorporated Alabama HRT of Florida, Inc. Florida HRT of Roanoke, Inc. Virginia HRT of Delaware, Inc. Delaware HR Interests, Inc. Texas Healthcare Realty of Tennessee, L.P. Tennessee _________________ * Each of the above listed subsidiaries is wholly owned by the Company. Other Affiliates* State of Organization Durham Medical Office Building, Inc. Texas HR Assets, Inc. (Inactive) Texas HR Capital, Inc. (Inactive) Texas HR Funding, Inc. (Inactive) Texas _________________ * The Company owns approximately 99% by value of the stock of each of the above listed other affiliates. The remainder of the affiliates' stock is owned by, and voting control rests with, executive officers of the Company.