A sprawling Colorado estate long owned by billionaire businessman, sailor, and avid art and wine collector William “Bill” ...

The post Oil Billionaire Bill Koch Lists His Eco-Friendly 'Once in a Lifetime' Aspen Estate for $125 Million—More Than Four ...

The energy mogul is looking to cash in on Aspen’s red-hot luxury market by offering up his massive property that’s replete ...

After selling a portion of his Elk Mountain Lodge estate in Aspen, Colo., billionaire industrialist Bill Koch is trying again ...