WATCH: Take a 360 tour of a former CIA director’s Long Island mansion

William Casey's 8.2-acre estate hasn't been on the market since 1948

A 19th century estate that was owned by a former CIA director is on the market for the first time since 1948.

Known as Mayknoll, the residence was built in 1855 by a former sea captain and William Casey bought it nearly a century later for $50,000. Trained as a lawyer, Casey was a high-ranking intelligence officer in World War II and went on to a career in politics and business.

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Some of his roles included a stint as the Under Secretary of State for Economic Affairs under President Richard Nixon, presidential campaign manager for Ronald Reagan, chairman of the SEC, and, most infamously, director of the CIA in the 1980s under Reagan.

His only child, Bernadette, is the current owner of Mayknoll, which comprises of a seven-bedroom mansion, her father’s famous library, two pools, a gym, two kitchens and three guest houses. The sprawling property is being sold in a sealed-bid process with an undisclosed reserve price.

Check out the video above for an exclusive look inside the mansion Casey called home until his death in 1987.