Astor was touted for her philanthropic work with the Astor Foundation, which gave generously to underprivileged youth through charities such as the Metropolitan Museum of Art, the New York Public Library and many others.
Moving trucks may be seen soon outside of the 64.5-acre estate designed by William Adams Delano, which has a barn, pool, cabana and cottage.
"It is a rare and beautiful estate, one of the last in Westchester County of this size and scope. It is an improving (real estate) market, and it finally reached a price where it became irresistible to a buyer who recognized the value," listing agent David Turner said to a local news source LoHud.com.
Astor's Park Avenue apartment sold for $21 million in 2008 after being listed originally for $46 million, according to Relocation.com. The New York apartment has 27 bedrooms.
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