Mid Century Modern. Tucked quietly among the trees on 9 private acres, this striking contemporary retreat - known as The Treehouse - offers a rare blend of architectural distinction and natural serenity, overlooking a peaceful swimming pond with its own dock. Designed in 1973 by Richard Stein around a 1950’s cottage, the home showcases a bold sawtooth roofline and clerestory windows that flood the interiors with natural light, while its passive solar design enhances both efficiency and great light. Inside, the dramatic living room is anchored by a wood-burning fireplace and wrapped in floor-to-ceiling glass, seamlessly connecting the indoors with the surrounding landscape. A Lutron Grafik Eye lighting system with multiple dimming zones creates a warm, customizable ambiance, beautifully illuminating both the interior and the wooded setting beyond. Entertaining flows effortlessly outdoors through sliding glass doors to an expansive main deck, complemented by a second private deck with an outdoor shower. The open kitchen is thoughtfully designed for gathering, featuring a Wolf range, Bosch dishwasher, and two Velux skylights with automatic rain sensors. Three bedrooms and two baths are well positioned for privacy and comfort, including a primary suite with a gas fireplace and a spa-like bath with radiant heat and a glass-tiled walk-in shower. A recently finished lower level features a family room, additional full bathroom, laundry room and a spacious unfinished 210 square foot storage room. Surrounded by nature, the property also offers access to scenic trails throughout the wooded acreage. Additional features include central air, a Nest system, and an automatic generator. Despite its tranquil setting, the home is ideally located just an hour and 45 minutes from NYC, with Metro-North trains a short 10–15 minute drive away and the charming Village of Millbrook only 15 minutes from your door.