 Following the purchase by William Swartwort in 1838, Sully was used as a home, a working farm, or both by a series of private owners. Then in 1958, Sully was acquired by the federal government as a part of the area to be used for the construction of Dulles Airport. One year later, Sully became a national historic site. Today the Fairfax County Park Authority operates the site with a specific focus on the Lee family.
