Ownership History
| SUMMER STREET RSK LLC | $18,150,000 | 12065/0326 | 27 | 12/18/2018 |
| 600 SUMMER LP | $10,650,000 | 11165/0172 | 27 | 01/28/2015 |
| SUMMER OFFICE BUILDING LTD PARTNERSHIP | $0 | 10009/0029 | 25 | 11/12/2010 |
| ANTARES 600 SUMMER STREET LP | $86,692,000 | 9080/0168 | 27 | 07/20/2007 |
| 600 SUMMER ST INVESTOR ASSOC LLC | $15,300,000 | 8387/0142 | 27 | 12/30/2005 |