6. Ellison Estate –Woodside, California $200 million
Owner: Larry Ellison—Co-founder of Oracle and the third-richest man in the world in 2013, according to Forbes.
7. Hearst Castle -San Simeon, California $191 million
Owners: William Randolph Hearst’s trustees—The castle, built by the country’s first newspaper magnate, is now a heritage and tourist site and part of the California Park System.
8. Seven The Pinnacle -Big Sky, Montana $155 million
Owners: Edra and Tim Blixseth—Real estate developer and timber baron Tim Blixseth cofounded the Yellowstone Club.
Owner: Roman Abramovich —a Russian billionaire and owner of the private investment firm Millhouse LLC. He’s best known as the owner of the English Premier League’s Chelsea Football Club.