Oil Billionaire Bill Koch Lists His Eco-Friendly ‘Once in a Lifetime’ Aspen Estate for $125 Million—More Than Four Times What He Paid Posted on October 3, 2025 By realejuicey Koch, 84, has owned the property for nearly 20 years—having purchased it back in 2007… Related posts: Billionaire oil magnate Bill Koch lists longtime 52-acre Aspen estate for $125M Photos: Lori Loughlin and Mossimo Giannulli’s California home lists for $16.5 million Mark Wahlberg’s Former L.A. Mansion Lists for $68 Million—but Loses Out on Most Expensive Home Title to $78 Million Florida Estate See also Jefferson County property transfers: Real estate sales range from $36,000 to $419,000
