Rare sculptural masterpiece by architect Charles Haertling hits the market in Boulder for less than $4 million
It would be difficult to find a more impressive Colorado home than the five-bedroom masterpiece at 630 Northstar Court in Boulder.
Built in 1976, it is one of only an estimated 50 houses ever built by a pioneering modernist architect Charles Hartlingwhose influential work was characterized by bold geometry and site-inspired design.
Newly renovated and ready for its next owners, the Boulder home first hit the market in May for $4.5 million and, after a price reduction, is now listed for $3.69 million. It is stated at Deanna Franco from Milehimodern.
Defined by two conical towers, the estate rises from the street like a double tent, but seen from above it looks more like a cassette tape.
Inside, approximately 3,654 square feet of living space unfolds in an open, intuitive layout that feels surprisingly practical given its 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 museum-like elegance with everyday comfort.
The home’s modernist aesthetic is both dramatic and grounding. Each tower is anchored by a wood-burning fireplace, while the walls of glass offer stunning 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 areas.
A meditation room, hot tub, and more than 1,600 square feet of terraces and patios provide plenty of space to connect with the outdoors.
Discreet sustainable upgrades, including a 4.5-kilowatt solar PV system, in-floor radiant heat, an EV charger, and two mini-splits, bring the home’s amenities list into the modern era while ensuring all-weather comfort.
The location is just as special. The property is tucked away in one of Boulder’s most coveted neighborhoods, 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 cafes are about a mile from the front door, all easily accessible via scenic bike paths.
