Joseph Sinnott Mansion | |
 Main Building at Rosemont College in December 2006 | |
   | |
| Location | Montgomery and Wendover Aves., Rosemont, Pennsylvania, U.S. |
|---|---|
| Coordinates | 40°2′0″N 75°19′46″W / 40.03333°N 75.32944°W |
| Area | 0.8 acres (0.32 ha) |
| Built | 1889-1891 |
| Architect | Samuel Huckel Jr. |
| Architectural style | Renaissance, Chateauesque |
| NRHP reference No. | 80003582[1] |
| Added to NRHP | August 29, 1980 |
The Joseph Sinnott Mansion, also known in Gaelic as "Rathalla," meaning "home of the chieftain on the highest hill" is the Main Building at Rosemont College. It is an historic home that is located on the campus of Rosemont College in Rosemont, Pennsylvania, was originally a part of the Ashbridge estate, and was called 'Rosemont Farm'.