| Name | State of Formation, Organization or Incorporation | ||||||||||
| First Potomac DC Holdings, LLC | Delaware | ||||||||||
| GOV NEW OPPTY LP | Delaware | ||||||||||
| GOV NEW OPPTY REIT | Maryland | ||||||||||
| Government Properties Income Trust LLC | Delaware | ||||||||||
| GPT Properties Trust | Maryland | ||||||||||
| SC Merger Sub LLC | Maryland | ||||||||||
| SIR Chicago LLC | Delaware | ||||||||||
| SIR Holdings Corporation | Maryland | ||||||||||
| SIR Operating Partnership LP | Delaware | ||||||||||
| SIR Properties Trust | Maryland | ||||||||||