Bill Koch's $99 Million Elk Mountain Lodge in Aspen Heads to Auction This July

Elk Mountain Lodge, William I. Koch's 52-acre legacy ranch tucked into Aspen's Castle Creek Valley, is headed to public auction this summer after nearly 500 days on the market at $99 million. Bidding is scheduled to open July 7, 2026 and conclude July 17, 2026 through Concierge Auctions' online marketplace, in cooperation with Compass broker Steven Shane.

The estate will be offered at no reserve beyond the opening price — a significant detail that Koch, an avid art and wine collector, is betting will trigger a competitive bidding war capable of pushing the final sale above the $99 million listing price. Earlier this year, Koch demonstrated his faith in the auction format when he raised $84 million auctioning his Western art collection through Christie's — the most expensive such sale of its kind.

A Compound That Cannot Be Replicated

Located at 125 Rooney Circle, approximately 11 miles from downtown Aspen, the approximately 25,277-square-foot compound spans 52 acres and comprises eight structures reflecting what the listing describes as the finest craftsmanship and high-end finishes. At its centre stands a grand main lodge designed by award-winning Colorado architecture firm Rowland+Broughton, featuring timber-beam interiors and soaring ceilings. The compound features 8 bedrooms and 10 bathrooms in total, spread across the main lodge and seven guest cabins, along with private trails, ponds, river frontage, hot tubs, an eight-car garage, and a dedicated fitness center — all set against panoramic views of the Elk Mountain Range

The ranch sits directly across from the American Lake Trailhead, placing it within immediate reach of some of the Elk Mountains' most celebrated hiking and ski touring terrain.

"One of the selling features of this property is that it cannot be replicated," Shane told the Aspen Times. "You cannot build this quantity of square footage in Aspen ever again."

A Long Road to the Auction Block

The history of Elk Mountain Lodge stretches back well over a century — the land began as a homestead, later operated as a dude ranch in the 1930s, and eventually served as a wedding and events venue before Koch purchased it in 2007 for $26.5 million. He subsequently transformed the property into a multigenerational private mountain retreat.

The path to auction has been anything but straightforward. Koch first tried to sell the property more than a decade ago, asking $100 million, before dropping the price to $80 million in 2016 — with the option to purchase the main 52-acre parcel separately for $60 million and the additional 31 acres for $20 million. The estate was eventually withdrawn from the market in 2017

The property returned to market in January 2025 at a record-breaking $125 million asking price, but a buyer never materialized. Koch subsequently reduced the list price to $99 million late last year. The auction represents the latest — and perhaps final — attempt to find a buyer after years of market exposure at the very top of Colorado's luxury real estate spectrum.

The Buyer Pool and the Broader Market

Despite Aspen's booming ultra-luxury market, properties at this price point occupy an extraordinarily rarefied tier. The buyer must not only possess extraordinary wealth but also a specific appetite for a sprawling, multigenerational mountain compound — a combination that, even in Aspen, is genuinely rare.

The current Aspen residential record belongs to Palantir CEO Alex Karp, who acquired a monastery ranch estate for $120 million in late 2025. Elk Mountain Lodge, depending on where bidding lands, could challenge or surpass that figure.

Koch himself framed the auction decision in personal terms. "The Aspen property has been an incredibly meaningful place for my family, but the time has come for someone else to enjoy it, and I look forward to seeing its next chapter unfold," he said in a statement.

As part of Concierge Auctions' Key For Key giving programme, the closing of Elk Mountain Lodge will also result in funding toward a new home built for a family in need through its partnership with Giveback Homes.

Bidding opens July 7 at conciergeauctions.com. Whether Elk Mountain Lodge finally changes hands after more than a decade of attempts — and at what price — will be one of the summer's defining moments in American luxury real estate.