Step into luxury with this to-be-built 6-bedroom, 5.1-bath Modern Transitional Colonial on a quiet cul-de-sac in Mountainside. Spanning 4,984 sq. ft. across three levels, this home offers exceptional craftsmanship and an early-stage opportunity to collaborate with the builder on select finishes, including cabinetry, countertops, and flooring.The main level (1,908 sq. ft.) features an open-concept kitchen and breakfast area flowing into a family room, plus a formal dining room, executive office, powder room, and guest en-suite. Upstairs (1,850 sq. ft.), the primary suite includes a five-fixture spa bath and oversized walk-in dressing room, with three additional bedrooms, two full baths, and a laundry center. The walk-out lower level (1,226 sq. ft.) adds a sixth bedroom, full bath, and large recreation area.Additional highlights include a built-in 1-car garage and double-width driveway. Mountainside offers a streamlined NYC commute via the Summit Midtown Direct train and Route 22 bus, top-rated schools including 2024 Blue Ribbon Deerfield School and Governor Livingston High School, and proximity to Watchung Reservation, Trailside Museum, Watchung Stable, major highways, and Newark Airport. A rare chance to customize your dream home today!