George Mason also helped Thomson Mason have a house constructed. Thomson and his wife, Sarah McCarty Chichester, celebrated Christmas, 1788 in the new house. However, as late as 1792 George Mason wrote Thomson about difficulties procuring lumber for the Hollin Hall front porch. Fire destroyed the house in 1824, four years after Thomson's death.
An outbuilding survived and became known as Little Hollin Hall. Purchased by Edward and Eliza Gibbs, it remained in use until the 20th century. In 1916, industrialist Harley Wilson and his wife bought the property and constructed a new residence, pool and other buildings. The Mount Vernon Unitarian Church bought the property from Mrs. Merle Thorpe in 1958. It hosted a Congress on Racial Equality (CORE) training workshop in 1961, as well as other civil rights activities, both local and national, during the next several years. The congregation also worked against the Vietnam War and for affordable housing. In 1983, the church sold part of the property to finance construction of a new meeting house to replace the old car garage. In 1994, with the help of Alexandria's Campagna Center, the main hall was restored as a decorator showcase, and started hosting concerts several years later. Further renovations were performed in 2003-2004.