William I. Koch lists Aspen ranch for auction

By AI, Created 1:21 PM UTC, May 27, 2026, /AGP/ – William I. Koch is taking his 52-acre Elk Mountain Lodge in Aspen to auction with Concierge Auctions and Steven Shane of Compass. The $99 million listing opens July 7 and closes July 17, underscoring how ultra-luxury sellers are using timed auctions to move rare trophy properties.

Why it matters: - Elk Mountain Lodge is being offered as one of the rarest luxury ranches in the American West. - The sale tests demand for a 52.2-acre Aspen estate with legacy appeal, major scale and a $99 million price tag. - Concierge Auctions is positioning the property for global buyers who want a defined timeline and a rare asset.

What happened: - William I. Koch will sell his Aspen ranch, Elk Mountain Lodge, at auction with Concierge Auctions in cooperation with Steven Shane of Compass. - The property is listed for $99 million. - Bidding is scheduled to open July 7, 2026 and end July 17, 2026 on conciergeauctions.com. - The ranch is located at 125 Rooney Circle in Aspen, Colorado.

The details: - Elk Mountain Lodge spans approximately 52.2 acres in Aspen’s Castle Creek Valley. - The compound measures about 25,277 square feet. - The estate includes eight structures. - The main residence was designed by Colorado architect Rowland+Broughton. - Seven guest cabins are included, along with a state-of-the-art fitness center. - The property has views of the Elk Mountain Range, two ponds, river frontage and an eight-car garage. - The architecture blends frontier-inspired design with luxury finishes and modern sustainability. - The estate sits about 11 miles from downtown Aspen. - Images of the property are available at Concierge Auctions. - Photography is credited to Shawn O’Connor. - The closing will support Concierge Auctions’ Key For Key® giving program with Giveback Homes, which funds new homes for families in need. - Agents will be compensated under the Listing Agreement. - Concierge Auctions says to see the Auction Terms and Conditions for full details. - More information, including property details and diligence documents, is available at ConciergeAuctions.com or by calling +1.212.202.2940.

Between the lines: - Koch framed auctions as a proven way to unlock strong outcomes for unique assets such as art and wine. - Chad Roffers, CEO and co-founder of Concierge Auctions, said the firm has sold legacy land and ranch assets at auction for nearly two decades. - Steven Shane said estates with this scale and provenance cannot be replicated today. - Aspen remains a strong draw because of its ski mountains, cultural institutions, dining scene and year-round recreation.

What’s next: - Bidding opens July 7 and closes July 17, 2026. - The winning buyer will take on one of Aspen’s most prominent private estates. - Concierge Auctions will direct a closing-related donation through its Key For Key® program.

The bottom line: - Koch is using the auction format to sell a trophy Aspen property with scarcity, scale and global visibility.