Set within Bernardsville's highly coveted "On the Mountain" enclave, this extraordinary residence is a rare offering steeped in architectural history and timeless charm. Originally the carriage house of famed nineteenth and twentieth century architect George B. Post Sr.'s estate, this expanded and thoughtfully converted 1890s structure rests on five point twenty-five private acres, accessed by a long, winding driveway that immediately sets the tone for serenity and seclusion. History echoes through the walls, where original stonework, century-old trees, and mature specimen plantings create a rich sense of place. The home strikes a beautiful balance between traditional authenticity and modern elegance. At the heart of the home is a dramatic living room with original stone details offering an inviting space for both grand entertaining and quiet reflection. With over five thousand square feet of living space, including a substantial addition completed in 2000, the home features five bedrooms and five full bathrooms, including a private nanny or guest suite with its own bathroom. Outdoor living is equally compelling with an in-ground pool and expansive grounds designed for privacy and tranquility. Car enthusiasts will appreciate the eight total garage spaces with two detached garages, a truly rare amenity. Just minutes from the New York City rail station, shopping, and the Somerset Hills Country Club providing its next owner with a remarkable lifestyle where natural beauty and peaceful living converge.