Sehner-Ellicott-Von Hess House is a historic home located at 123 N. Prince Street, Lancaster, Pennsylvania. It was built about 1780 by George Sehner, and is a finely restored house built in the Georgian style of architecture. It was occupied by Andrew Ellicott (1754–1820), first United States Surveyor General, from 1801 to 1813.[2] Ellicott helped prepare Captain Meriwether Lewis for his exploration of the Louisiana Purchase.