EXHIBIT 21

Subsidiaries of the Registrant



|                                               |  |                       
|---------------------------------------------- |  | ----------------------
|Subsidiary                                     |  | State of
Incorporation
|5901 Westown Parkway MOB, LLC                  |  | DE                    
|593HR, Inc.                                    |  | TN                    
|Allenmore C, LLC                               |  | DE                    
|Ankeny North MOB, LLC                          |  | DE                    
|Bellaire Medical Plaza SPE, LLC                |  | DE                    
|Clive Wellness Campus Building Five, LLC       |  | DE                    
|Clive Wellness Campus Building One, LLC        |  | DE                    
|Clive Wellness Campus Building Two, LLC        |  | DE                    
|Dallas County MOB, LLC                         |  | DE                    
|Des Moines South Medical Building II, LLC      |  | DE                    
|Des Moines South Medical Building, LLC         |  | DE                    
|Durham Medical Office Building, Inc.           |  | TX                    
|Healthcare Acquisition of Texas, Inc.          |  | AL                    
|Healthcare Realty Services Incorporated        |  | TN                    
|HR 9191 Pinecroft Manager, LLC                 |  | DE                    
|HR 9191 Pinecroft SPE, LLC                     |  | DE                    
|HR Acquisition I Corporation                   |  | MD                    
|HR Acquisition of Alabama, Inc.                |  | AL                    
|HR Acquisition of Pennsylvania, Inc.           |  | PA                    
|HR Acquisition of San Antonio, Ltd.            |  | AL                    
|HR Acquisition of Virginia Limited Partnership |  | AL                    
|HR Assets, LLC                                 |  | DE                    
|HR Briargate, LLC                              |  | DE                    
|HR Carolinas Holdings, LLC                     |  | DE                    
|HR Dakota, LLC                                 |  | DE                    
|HR Interests, Inc.                             |  | TX                    
|HR Ironbridge MOB SPE, LLC                     |  | DE                    
|HR Ladco Holdings, LLC                         |  | DE                    
|HR Lowry Medical Center SPE, LLC               |  | DE                    
|HR MAC II, LLC                                 |  | DE                    
|HR McNaughten SPE, LLC                         |  | DE                    
|HR of Bonita Bay, Ltd.                         |  | AL                    
|HR MRMC MRMC MOB II SPE, LLC                   |  | DE                    
|HR MRMC MRMC MOB III SPE, LLC                  |  | DE                    
|HR of California, Inc.                         |  | AL                    
|HR of Carolinas, LLC                           |  | DE                    
|HR of Indiana, LLC                             |  | DE                    
|HR of Iowa, LLC                                |  | DE                    
|HR of Kingsport, Inc.                          |  | AL                    
|HR of Los Angeles, Inc.                        |  | AL                    
|HR of Los Angeles, Ltd.                        |  | AL                    
|HR of Massachusetts, Inc.                      |  | AL                    
|HR of Nashville, LLC                           |  | DE                    
|HR of San Antonio, Inc.                        |  | TX                    
|HR of Sarasota, Ltd.                           |  | AL                    
|HR Oregon MOB Venture, LLC                     |  | DE                    
|HR Richmond Community SPE, LLC                 |  | DE                    



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|                                                 |  |   
|------------------------------------------------ |  | --
|HR Richmond Manager SPE, LLC                     |  | DE
|HR St. Francis MOB I SPE, LLC                    |  | DE
|HR St. Marys MOB NW SPE, LLC                    |  | DE
|HR St. Marys MOB South SPE, LLC                 |  | DE
|HR St. Marys West SPE, LLC                      |  | DE
|HR Washington MOB Venture, LLC                   |  | DE
|HR-Pima, LLC                                     |  | DE
|HRP MAC III, LLC                                 |  | DE
|HRT Holdings, Inc.                               |  | DE
|HRT of Alabama, Inc.                             |  | AL
|HRT of Delaware, Inc.                            |  | DE
|HRT of Illinois, Inc.                            |  | DE
|HRT of Louisiana, Inc.                           |  | LA
|HRT of Mississippi, Inc.                         |  | DE
|HRT of Roanoke, Inc.                             |  | VA
|HRT of Tennessee, Inc.                           |  | TN
|HRT of Virginia, Inc.                            |  | VA
|HRT Properties of Texas, Ltd.                    |  | TX
|K-S Building SPE, LLC                            |  | DE
|Lakewood MOB, LLC                                |  | DE
|Pasadena Medical Plaza SSJ Ltd.                  |  | FL
|Pennsylvania HRT, Inc.                           |  | PA
|Property Technology Services, Inc.               |  | TN
|Roseburg Surgery Center, LLC                     |  | DE
|Southwest General Medical Building (TX) SPE, LLC |  | DE
|Stevens Pavilion Parent, LLC                     |  | DE
|Stevens Pavilion, LLC                            |  | DE
|Yakima Valley Parent, LLC                        |  | DE
|Yakima Valley Subsidiary, LLC                    |  | DE



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