Impressive, super spacious & beautifully updated Colonial privately set on 3.87 sylvan acres with a dream backyard: giant, private, fenced & flat like a pancake. Two-story entry foyer. Stylish formal living room w/double French door entry, fireplace, recessed lighting & hardwood flooring. Elegant formal dining room. Open, chef's kitchen smartly outfitted w/Viking Professional range & hood, Sub-Zero refrigerator/freezer, Miele dishwasher, built-in GE microwave oven, plus an extra sink in the center island w/breakfast bar. Brightly windowed breakfast area for casual dining with French door to expansive patio w/awesome outdoor kitchen for easy dining alfresco. Kitchen/breakfast area adjoins great room w/fireplace, cathedral ceiling & clerestory windows w/remote-controlled shades. Executive-level home office. Sunroom decorated as playroom w/French door to side yard. Luxurious, king-sized primary suite w/private lounge area, two walk-in closets & sumptuous, resort-worthy primary ensuite bath featuring freestanding bathtub, glass-walled steam shower w/rainforest shower head, separate commode closet & two spacious vanities. Three spacious bedrooms endowed w/blackout shades, outfitted closets, recessed lighting & hardwood flooring, including a front-facing bedroom w/ensuite bath, and a "Jack-n-Jill" bedroom/bathroom arrangement. Comfortable, private guest/au pair accommodation w/adjoining full bath. Large upper-level family/playroom w/large windows on three sides. Main-level laundry room adjoins mud room w/back staircase & access to 3-car attached garage. Full, unfinished 2500sqft walkout lower level showcases the heavy duty poured concrete foundation & steel joist beams. Excellent outdoor entertaining amenities include a finely masoned stone, gas-fueled firepit & expansive terrace, plus a large outdoor kitchen w/gas grill & bar. Private, flat backyard ideal for play or relaxation. Preserved woodlands buffer the property. All buttoned up with a new roof & extensive solar-array, which eliminates electric utility bills, plus the level-2 car charger in the attached 3-car garage means you can power your electric vehicle for free. A Generac automatic ("whole house") generator backs everything up. Chappaqua train parking. Estate area. Exquisite inside & out.