Nestled at the end of a prestigious cul-de-sac, this exceptional 6-bedroom, 4.1-bath Colonial is a rare find, offering luxurious space, modern amenities, and multi-generational living potential. A circular driveway leads to this stately home, featuring a 3-car garage and a grand two-story foyer. Entertain effortlessly in the spacious dining room, living room, and expansive eat-in kitchen designed for a crowd with an oversized island, 2 dishwashers, abundant storage, and a large walk-in pantry. The kitchen flows seamlessly into the great room with wood burning stove, where french doors open to a large composite deck. The main-level primary suite is a private retreat with two walk-in closets and a spa-like bath featuring a double vanity, oversized shower, tub, and separate water closet. Upstairs, five additional bedrooms (four of which have walk-in-closets), three full baths, and a second primary suite with a sitting room/office await, along with a convenient second-floor laundry room. A finished walk-out basement adds versatility, while the inground saltwater splash pool, hot tub and fire pit provide the perfect outdoor escape. 220 Outlet in Garage. Mountainside is conveniently located within a few miles of Newark Liberty Int'l airport, Rts. 22, 78,24, GSP and multiple NYC commuting options. Home to Blue Ribbon Grammar and Middle School, the Watchung Reservation, Watchung Stables and more - this is truly a magnificent place to call home.