Hours after news broke that billionaire William Koch listed his Aspen estate for $89.9M, photos of the wooded compound, which just became 13th priciest listing in the country, have surfaced. Having scoured architects' brochures, Curbed Ski publishes the construction details, which at least partially explain how Koch gets away with listing something he bought for $26.5M in 2007 for $90M, and photos, right this way. [Curbed Ski; previously]
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