4300 Lake County Highway Experience this striking 5-acre architectural estate designed by renowned architect Nan Hearst. The 3, 600 sq. ft. residence showcases a distinctive half-circle design positioned to capture sweeping views over Calistoga, surrounding vineyards, and the Napa Valley beyond. Expansive walls of glass fill the home with natural light and frame the dramatic scenery. Inside are three spacious bedrooms and two baths, with soaring ceilings, wood and concrete floors, and multiple fireplaces creating warmth and character. The chef's kitchen includes a premium gas range, Sub-Zero refrigerator, and a scenic balcony overlooking the valley. Outdoor living centers around a sparkling pool with a dedicated bath, creating a private resort-style setting. The property is thoughtfully equipped with solar power, Tesla Powerwall, backup generator, a 5, 000-gallon water tank, metal roof with fire sprinklers, carport, and an on-site fire hydrant. An 1, 100 sq. ft. ADU offers two bedrooms, two baths, partial kitchen, fireplace, laundry, and an attached garageideal for guests or rental income. Just 10 minutes to Calistoga, this rare Napa Valley property combines architecture, sustainability, and breathtaking vineyard views.