You’ll have to boast a particularly robust bank account to nab billionaire Bill Koch’s newly listed wintry Colorado retreat.

Billionaire energy mogul Bill Koch is looking to cash in on Aspen’s red-hot luxury real estate market by listing his ...

TOPEKA, Kan. (AP) — Bill Koch won the America’s Cup, formed a commission to study criminal justice issues — and sued two of his brothers. He was expected to be the star witness during the third week ...

Billionaire Bill Koch has listed his 52-acre Aspen retreat for sale for $125 million. The Elk Mountain Lodge property hit the ...