Welcome to 451 Ardsley Road, where an extraordinary backyard oasis in the award-winning Edgemont School District sets this home apart from anything else on the market! Nestled on close to an acre at the end of a long private driveway, this secluded retreat offers a resort-style setting complete with a heated in-ground pool, pool house/cabana, tranquil private pond with a charming drawbridge, multiple patios and terraces, and beautifully manicured grounds designed for year-round enjoyment. Spanning over 5,800 square feet, this expanded split-level home features 5 bedrooms and 3.5 bathrooms with an exceptional layout. A sun-filled foyer with vaulted ceilings welcomes you into a grand living room with a gas-burning fireplace, radiant heated floors, 1st-floor Bedroom, powder room, and direct access to the spectacular backyard. The main level features a spacious dining room, bright skylit kitchen, and an incredible all-season room showcasing exposed brick and wood accents, stone tile flooring, multiple skylights, a built-in bar, and access to an expansive terrace, perfect for indoor and outdoor entertaining. Upstairs, the luxurious primary suite serves as a private retreat with its own fireplace, two oversized custom walk-in closets, private terrace overlooking the grounds, and an ensuite bath featuring a jacuzzi tub and steam shower. An additional bedroom offers its own ensuite bath, while the remaining bedrooms are generously sized. The lower level provides endless flexibility with space for an additional family room, rec. area or home gym, workshop, laundry room, tons of storage, and direct access to the oversized 3-car garage. Located just a mile from the Scarsdale Metro-North station with a 30-minute express commute to Manhattan, this exceptional home offers the rare combination of award-winning schools, unmatched privacy, resort-style outdoor living, and over 4,500 square feet of beautifully designed living space. Opportunities like this rarely come to market in Edgemont!