Exhibit 21.1
Subsidiaries of Franklin Street Properties Corp.
| Name | Jurisdiction of Organization |
| FSP 801 Marquette Avenue LLC | Delaware |
| FSP 121 South Eighth Street LLC | Delaware |
| FSP 3150 Fairview Park Drive LLC | Delaware |
| FSP 380 Interlocken Corp. | Delaware |
| FSP 390 Interlocken LLC | Delaware |
| FSP 4807 Stonecroft Boulevard LLC | Delaware |
| FSP 4820 Emperor Boulevard LLC | Delaware |
| FSP Addison Circle Corp. | Delaware |
| FSP Addison Circle Limited Partnership | Texas |
| FSP Addison Circle LLC | Delaware |
| FSP Blue Lagoon Drive Corp. | Delaware |
| FSP Blue Lagoon Drive LLC | Delaware |
| FSP Bollman Place Limited Partnership | Massachusetts |
| FSP Collins Crossing Corp. | Delaware |
| FSP Collins Crossing Limited Partnership | Texas |
| FSP Collins Crossing LLC | Delaware |
| FSP Dulles Virginia LLC | Delaware |
| FSP East Baltimore Street LLC | Delaware |
| FSP Eden Bluff Corporate Center I LLC | Delaware |
| FSP Eldridge Green Corp. | Delaware |
| FSP Eldridge Green Limited Partnership | Texas |
| FSP Eldridge Green LLC | Delaware |
| FSP Forest Park IV LLC | Delaware |
| FSP Forest Park IV NC Limited Partnership | North Carolina |
| FSP Greenwood Plaza Corp. | Delaware |
| FSP Hillview Center Limited Partnership | Massachusetts |
| FSP Holdings LLC | Delaware |
| FSP Innsbrook Corp. | Delaware |
| FSP Investments LLC | Massachusetts |
| FSP Lakeside Crossing I LLC | Delaware |
| FSP Legacy Tennyson Center LLC | Delaware |
| FSP Liberty Plaza Limited Partnership | Texas |
| FSP Montague Business Center Corp. | Delaware |
| FSP Northwest Point LLC | Delaware |
| FSP One Legacy Circle LLC | Delaware |
| FSP One Overton Park LLC | Delaware |
| FSP Park Seneca Limited Partnership | Massachusetts |
| FSP Park Ten Development Corp. | Delaware |
Exhibit 21.1
Subsidiaries of Franklin Street Properties Corp.
| Name | Jurisdiction of Organization |
| FSP Park Ten Development LLC | Delaware |
| FSP Park Ten Limited Partnership | Texas |
| FSP Park Ten LLC | Delaware |
| FSP Park Ten Phase II Limited Partnership | Texas |
| FSP Property Management LLC | Massachusetts |
| FSP Protective TRS Corp. | Massachusetts |
| FSP REIT Protective Trust | Massachusetts |
| FSP River Crossing LLC | Delaware |
| FSP Southfield Centre Limited Partnership | Massachusetts |
| FSP Willow Bend Office Center Corp. | Delaware |
| FSP Willow Bend Office Center Limited Partnership | Texas |
| FSP Willow Bend Office Center LLC | Delaware |