Billionaire energy mogul Bill Koch is looking to cash in on Aspen’s red-hot luxury real estate market by listing his sprawling 52-acre mountain estate for a staggering $125 million, the Wall Street Journal reported. Koch, 84, who built his $2 billion fortune in oil and investments, purchased the property in 2007 for $26.5 million. Over the years, he expanded and transformed the former event venue into a private retreat, adding guest cabins,…
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