The property became part of Fairmount Park in 1869 as part of a program to preserve the quality of the water supply.
In anticipation of the Philadelphia Centennial Exposition in 1876, a large dining pavilion was built alongside the mansion.
Belmont was added to the Philadelphia Register of Historic Places, June 26, 1956.
The site continued to be used for public entertaining until it became a historic house museum under the management of the American Women's Heritage Society in 1986.
The complex is also available for special events and rentals.

In June 2007, the Underground Railroad Museum was opened at the mansion.

The mansion lends its name to the surrounding neighborhood of Belmont.
The property became part of Fairmount Park in 1869 as part of a program to preserve the quality of the water supply. In anticipation of the Philadelphia Centennial Exposition in 1876, a large dining pavilion was built alongside the mansion. Belmont was added to the Philadelphia Register of Historic Places, June 26, 1956. The site continued to be used for public entertaining until it became a historic house museum under the management of the American Women's Heritage Society in 1986. The complex is also available for special events and rentals.
In June 2007, the Underground Railroad Museum was opened at the mansion.
The mansion lends its name to the surrounding neighborhood of Belmont.
Belmont Mansion (Philadelphia)