William Koch, the billionaire brother of Tea Party darlings David and Charles, has listed his expansive Aspen ski mansion for $89.9 million, according to The Aspen Daily News (via Curbed).
Koch bought the 55-acre property, formerly a hotel, in 2007 for $26.4 million. He transformed it into a stunning ski house with 15 bedrooms, a gym, and several guest houses.
The home was renovated by architecture firm Rowland + Broughton, which has pictures of the interior.
Compared to his politically minded brothers, William is relatively private, though he does have some interesting hobbies. A fan of the Old West, he's currently building a replica of an entire western town to house his large collection of memorabilia, and once paid more than $2 million at auction for a rare photo of Billy the Kid.
Last year, Koch spent nearly $20 million on the Cape Cod estate formerly owned by the Mellon banking family.
SEE ALSO: Billionaire Bill Koch Buys The Mellon Compound On Cape Cod For $19.5 Million
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