Timeless elegance meets modern luxury in this masterfully reimagined, Fully Renovated 6-bedroom, 4.5-bath Classic Custom Colonial. Spanning four expansive levels of finished living space, this Westfield masterpiece showcases unparalleled craftsmanship, exquisite custom millwork, and high-end finishes at every turn.The main level welcomes you with a bright home office, an elegant dining room, and a gourmet Chef's Kitchen that flows seamlessly into a cozy living room anchored by a warm fireplace.Bathed in natural light, the serene sunroom offers a tranquil retreat perfect for morning coffee or afternoon relaxation. Upstairs, the second floor features spacious secondary bedrooms and a luxurious primary suite retreat, complete with his-and-hers walk-in closets and a spa-like bath.The third floor provides additional private bedrooms, offering the perfect layout for guests, au pair living, or a second home office.Incredible functionality awaits in the fully finished lower level, which boasts an open-concept recreation area, a dedicated gym or flex room, a private bedroom, and a full bath. The standout laundry room elevates everyday convenience with custom cabinetry, quartz countertops, and a premium washer and dryer setup. Positioned on a beautifully manicured lot with a detached two-car garage, 555 Mountain Ave offers an unbeatable location for the modern commuter situated less than a mile from vibrant downtown Westfield, premier shopping, fine dining, and the NYC train station.