oil-billionaire-bill-koch-lists-his-eco-friendly-once-in-a-lifetime-aspen-estate-for-125-million-more-than-four-times-what-he-paid-2, 3413073,

Oil Billionaire Bill Koch Lists His Eco-Friendly ‘Once in a Lifetime’ Aspen Estate for $125 Million—More Than Four Times What He Paid

Koch, 84, has owned the property for nearly 20 years—having purchased it back in 2007…
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