Both Edith Bouvier Beale, Onassis' aunt, and her cousin, Edith Beale, were living in squalor and seclusion in the dilapidated house in the 1970s when the documentary was made.
Onassis and her sister, Lee Radziwill, eventually gave the Beales the money to make improvements to the home.
Edith Beale sold the house to Washington Post editor Ben Bradlee and his journalist wife, Sally Quinn, in 1979.
The couple renovated and restored the home back to its original condition, according to the Corcoran Group, the real estate company listing the property.
Built in 1897, the seven-bedroom estate boasts, among other features, ocean views, a pool, tennis courts and a guest house, according to the listing.
The price is listed at $19,995,000.
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