In the great European tradition, the most storied country estates were always those with genuine hydrographic identity—a river, a lake, or ideally both, defining the property's character and daily rhythm across generations. At 21805 Koa Lane in Star, Idaho, the estate has both. Over 1,200 feet of Boise River frontage. More than 2,400 feet of private lake frontage. Bordered by protected state land. And 17.5 total acres behind the gates of an exclusive waterfront enclave that few Idaho residents even know exists. Le Domaine des Eaux is not marketing language for this property, it's an accurate structural description of what makes 21805 Koa Lane one of Idaho's most iconic legacy estates. The residence honors the water at every scale. Nearly 12,000 square feet of interior living space designed around dramatic walls of glass with water views from every room. Designer finishes and custom stonework introduced in extensive 2024-2026 renovations. Five bedrooms, seven baths, and a floor plan that separates the private wing from the entertainment infrastructure with the kind of intentional planning that distinguishes serious estate architecture from generic large-house construction. The main-level primary suite anchors the private wing. The gourmet kitchen, with a second kitchen upstairs supporting the remodeled poker room and lounge, handles the residence's substantial entertaining calendar. The statement wine room organizes the collection. And the 6,000+ square feet of covered outdoor living space extends the interior into the Idaho air across pergola lounges, fire features, an outdoor kitchen with Wolf grill and Traeger smoker, and fountains distributed throughout the grounds. The recreational program is where Le Domaine des Eaux ceases to be a residence and becomes a destination. A full indoor regulation basketball court with viewing lounge. A professional-grade pickleball court. A state-of-the-art theater with seating for twelve. A commercial-grade wellness retreat with $70K+ in Rogue equipment and a sauna. A heated pool and spa with waterfall-edge features. Private lakes. Sandy beachfront. A new dock. And 4,200+ square feet of garage space (sixteen parking positions) handling the collection. You walk down to the dock at sunset, the private lakes catching the last light, the Boise River threading through the property's northern boundary, and Le Domaine des Eaux delivers what the phrase has always promised in French country estate tradition, an integrated ecosystem of water, land, architecture, and infrastructure operating as one continuous private world.

1,200+ Feet of Boise River Frontage & 2,400+ Feet of Private Lake Frontage – The estate's defining hydrographic identity — a legacy waterfront position on the Boise River combined with more than 2,400 feet of private lake frontage, bordered by protected state land for permanent privacy.

Idaho's Legacy Estate — 17.5 Acres, Nearly 12,000 Sq Ft – One of Idaho's most iconic legacy estates, with 17.5 acres, nearly 12,000 square feet of interior living, 6,000+ sqft of covered outdoor living, and 4,200+ sqft of garage space accommodating up to 16 vehicles.

2024-2026 Renovations — Designer Finishes, Custom Stonework & Walls of Glass – Extensive recent renovations introduced designer finishes, custom stonework, and dramatic walls of glass framing water views from every room — bringing a 2015 build to today's highest standard.

Indoor Regulation Basketball Court, Pickleball Court & 12-Seat Theater – Full indoor regulation basketball court with viewing lounge, professional-grade pickleball court, and state-of-the-art theater with seating for twelve — recreational infrastructure at genuine institutional scale.

Heated Pool with Waterfall Features, Private Lakes & Sandy Beachfront – Heated pool and spa with waterfall-edge features, private lakes, sandy beachfront, new dock, outdoor kitchen with Wolf grill and Traeger smoker, pergola lounges, fountains, and a commercial-grade wellness gym with $70K+ Rogue equipment and sauna.

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About Star & the Boise Valley, Idaho

Star — Idaho's Fastest-Growing Luxury Corridor – Star sits at the western edge of the Boise metropolitan area along the Boise River, with a residential character defined by acre-plus estates, river and lake access, and the pastoral Idaho landscape that has driven significant relocation from higher-tax coastal states.

Boise River Frontage — A Rare Idaho Asset – Substantial private frontage on the Boise River is one of Idaho's rarest and most valuable residential assets, with 21805 Koa Lane offering more than 1,200 feet of river frontage — a legacy configuration.

Middleton School District – The Middleton School District serves the property, with Mill Creek Elementary and Middleton Middle and High Schools (8/10 GreatSchools) providing top-rated Idaho public education.

Boise — 30 Minutes East – Downtown Boise's restaurants, cultural institutions, and full metropolitan infrastructure sit approximately 30 minutes east, with Boise State University and the broader Treasure Valley business community anchoring the region.

Boise Airport — 35 Minutes – Boise Airport provides nonstop domestic service to major hubs including San Francisco, Los Angeles, Seattle, Denver, Salt Lake City, Dallas, and Chicago approximately 35 minutes from the estate.