Billionaire Bill Koch has listed his expansive Aspen estate for $125 million ... He also owns a 4,500-acre Colorado ranch featuring a 75-building replica of an Old West town.

A sprawling Colorado ... Koch has just hit the market. Nestled amid a scenic alpine valley tucked in between Castle Creek and the peaks of the Elk Mountains, about 10 miles outside of downtown ...

After selling a portion of his Elk Mountain Lodge estate in Aspen, Colo., billionaire industrialist Bill Koch is trying again to unload the rest of the property. This time he’s asking $125 ...

A sprawling Colorado estate long owned by billionaire businessman, sailor, and avid art and wine collector William “Bill” Koch has just hit the market. Nestled amid a scenic alpine valley tucked in ...

PITKIN COUNTY, Colo. — Billionaire Bill Koch has listed his 52-acre Aspen retreat for sale for $125 million. The Elk Mountain Lodge property hit the market on Wednesday, and Koch was confirmed ...