Oil Billionaire Bill Koch Lists His Eco-Friendly 'Once in a Lifetime' Aspen Estate for $125 Million—More Than Four Times What He Paid – SFGATE
ECO Friendly Living USA > Blog > Uncategorized > Oil Billionaire Bill Koch Lists His Eco-Friendly 'Once in a Lifetime' Aspen Estate for $125 Million—More Than Four Times What He Paid – SFGATE