[4] In 1836, Margaret Mercer purchased the Belmont home from Lee's heirs; she intended to adapt it as a women's Christian school.

In 1887, the home was bought by Frederick P Stanton, a governor of Kansas, who sold it in 1907 to John Scott Ferguson, a Pittsburgh attorney and cousin of Evelyn Nesbit Thaw.

In 1915, Edward B. McLean, son of the publisher of The Washington Post acquired the property[6] and built a horse stable and training track for Thoroughbreds.

It received an extensive addition to incorporate restaurants and the club house, all within the overall architectural theme and style of the original home.

Within the original home, despite the damage sustained from neglect, various bas relief artworks and plasterwork remained in place.

[10] The Belmont Manor house sits on the peak of the plantation property and one of the highest points in eastern Loudoun County.

The stairway is an ornamental structure in the center hall section that has a "molded handrail and thin, square balusters, three to a step."