Montana's Most Expensive Home: $72M Island Mansion Stalls After Owner's Death

A massive 45,000-square-foot estate on its own private island in Montana is now the most expensive home for sale in the state, listed at $72 million. But the project was never finished — and hasn’t moved in more than two years. Location: Cromwell Island, Flathead Lake (Dayton, MT) Square Footage: 45,000 sq. ft. (mid-construction) Lot Size: 348 acres (entire private island) Standout Feature: Largest privately owned freshwater island west of the Mississippi This isn’t just remote — it’s completely cut off. Cromwell Island rises out of Flathead Lake with nearly three miles of shoreline and nothing but open wilderness in every direction. Across the water sits Wild Horse Island, a place tied to Native history where horses were once swum across the lake for protection. And perched above it all is something that looks more like a European palace than a Montana home. The mansion — known as “The Villa” — was designed to be enormous. Inside, you’re greeted by raw scale: towering ceilings, unfinished stonework, and a cavernous entry hall where a sweeping curved staircase was clearly meant to anchor the space. Right now, it’s just a skeletal frame — a vision paused. Rooms stretch across thousands of square feet, with spaces intended for grand entertaining, luxury living, and panoramic views of the lake. But instead of finishes, there’s exposed structure and silence. The property was owned by Robert M. Lee, a Long Island-born entrepreneur, explorer, and conservationist who purchased Cromwell Island in the late 1980s. Lee wasn’t your typical buyer. He founded Hunting World, a luxury outfitting brand that grew out of his experience leading safaris across Africa, and he built a reputation as a collector, writer, and outdoorsman. He led expeditions in dozens of countries and even helped push early conservation protections for endangered species overseas. Before his death in 2016 at age 88, Lee and his wife had begun building what was intended to be an extraordinary estate on the island — a villa-scale residence with roughly 45,000 square feet of living space. But construction was never completed. Nearly a decade later, the structure still stands unfinished, frozen in time. Entire 348-acre private island Nearly 3 miles of shoreline on Flathead Lake Four-story stone villa with European-inspired design Massive terraces overlooking lake and mountains Total seclusion — no immediate neighbors Views of Wild Horse Island and surrounding wilderness One of the largest privately owned freshwater islands in the U.S. For context, Montana’s median home price is around $500,000. This property is asking more than 140 times that — and still requires a buyer willing to take on an unfinished mega-project in a remote location. It’s also been on the market for over 700 days, suggesting that even ultra-high-end buyers are hesitant. It’s not just a luxury home — it’s an unfinished vision from a larger-than-life owner. And now, it’s waiting for someone bold enough to finish what he started. Click here to view the complete listing on Zillow. Idaho’s Most Expensive Listing Is $26.2M — A 600-Acre Retreat With Trout Ponds, Mountain Views Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on Reddit (Opens in new window) Reddit Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Secluded Luxury: 5 Waterfront Estates Over $5 Million in the San Juan Islands The San Juan Islands are no stranger to luxury, but the market is seeing a wave of properties that raise the bar even higher. From secluded waterfront estates to modern retreats with sweeping Salish Sea views, these homes — each priced at more than $5 million — represent some of… Own A Private Island With An 11-Bedroom Historic Estate In Upstate NY For $4.2M If you’ve ever wanted to disappear to your own island — but still host 10 of your closest friends — this upstate New York property might be as close as it gets. Tucked just yards from the Canadian border in Alexandria Bay, this 11-bedroom estate sits on its own private… Fall in Love: 5 Cozy San Juan Islands Boutique Hotels for an Autumn Escape Crisp mornings, fiery leaves, and ferry rides across glassy waters—fall is the perfect season to discover San Juan Islands boutique hotels. The crowds of summer thin out, but the islands’ charm only sharpens: wood-smoke drifting from chimneys, quiet beaches strewn with driftwood, and small-town inns offering steaming mugs of coffee.…