The hall was listed on the National Register of Historic Places in 1973, and the extensive estate grounds are open to the public as a nature preserve.

[2] South Mountain was founded in 1918 by Elizabeth Sprague Coolidge, who had moved to the Berkshires in a bid to improve her husband's health.

A longtime supporter of chamber music, Mrs. Coolidge in 1916 established the Berkshire String Quartet, which at first gave concerts in her home.

The grounds are operated by the non-profit that manages the facility as a nature preserve open to the public on a year-round basis.

The long side opposite the entrance has five bays, each of which is fitted with a French door, and there are casement-style windows above them for ventilation.