Rare Sculptural Masterpiece by Architect Charles Haertling Hits the Market in Boulder for Under $4 Million

You’d be hard-pressed to find a more show-stopping home in Colorado than the five-bedroom masterpiece at 630 Northstar Court in Boulder.

Built in 1976, it is one of only an estimated 50 homes ever built by pioneering modernist architect Charles Haertling, whose influential work was defined by bold geometry and site-inspired design.

Recently renovated and ready for its next owners, the Boulder home first came on the market in May for $4.5 million and, following a price reduction, is now being offered at $3.69 million. It’s listed with Deanna Franco of Milehimodern.

Defined by twin cone-shaped towers, the estate rises from the street like a double tent, yet it looks more like a cassette tape when viewed from above.

Inside, approximately 3,654 square feet of living space unfold in an open, intuitive layout that feels surprisingly practical given the unique design.

According to the listing, virtually no other Haertling home has ever been restored with this level of care, and the result is a highly livable space that balances museumlike elegance with everyday comfort.

The home’s modernist aesthetic is both dramatic and grounding. Each tower is anchored by a wood-burning fireplace, while walls of glass frame sweeping views of the Flatirons. Natural light fills the interiors, and organic materials soften sharp lines. 

Connection to the outdoors is paramount here, and extends far beyond the primary living spaces.

A meditation room, hot tub, and more than 1,600 square feet of decks and patios provide ample space to connect with the outdoors.

Discreet sustainable upgrades, including a 4.5-kilowatt solar PV system, in-floor radiant heating, an EV charger, and two mini-splits, bring the home’s amenity list into modern times while ensuring comfort in all weather.

The location is equally special. Tucked into one of Boulder’s most coveted neighborhoods, the property sits directly across from a private community pool, pickleball and tennis courts, and volleyball courts.

Trails with panoramic views of the Flatirons are just a 300-foot walk away, while Lucky’s Market, popular restaurants, and neighborhood cafés are roughly a mile from the front door, and all are easily accessed by scenic bike paths.