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 19th and 20th century architect George B. Post Sr.'s estate, this expanded and thoughtfully converted 1890s structure rests on 5.25 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, original stone details and offering an inviting space for both grand entertaining and quiet reflection. Over 5,000 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 bath. Outdoor living is equally compelling, 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 NYC rail station, shopping, and the Somerset Hills Country Club, providing its next owner with a remarkable lifestyle, natural beauty, and peaceful living converge.