In 1910, Sotterley changed hands once again when it was sold to Herbert L. Satterlee and his wife Louisa, daughter of J. Pierpont Morgan. In a twist of fate, the Satterlees, like the Platers, traced their ancestry to Sotterley Hall in Great Britain.

The Satterlees spent several years restoring the Mansion house and grounds to their 18th century condition, subsequently using it as their summer residence. Their daughter, Mabel Satterlee Ingalls, purchased the plantation in 1947.

Having grown to love Sotterley through a childhood of summers spent amidst its charms, she determined to preserve it and to share it. In 1961, she created the non-profit Sotterley Mansion Foundation, later becoming Historic Sotterley, Inc., which holds the historic site trust for the public.