Redeem now 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.
This story is available exclusively to Business Insider subscribers. Become an Insider and start reading now. Have an account? Log in.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.
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