Welcome to 35 Chicken Valley Road, an extraordinary estate in the prestigious enclave of Old Brookville. This gated Brick Center Hall Colonial, masterfully built by the renowned Worrell Group, sits on 4.5 acres of impeccably manicured, estate-quality grounds and offers nearly 10,000 sq ft of finished living space across all levels. A circular drive leads to the stately entryway, accented by a stunning fountain that anchors the grand approach. Step inside to a breathtaking 22-foot entryway with soaring ceilings, intricate moldings, and wainscot paneling framing the sweeping staircase. The double-height foyer introduces refined formal spaces, including a living room with a wood-burning fireplace adorned with an ornamental mantel, marble inlay, and elegant dental molding. Double columns guide you into the sophisticated sitting room, where French doors open to the terrace and create effortless indoor-outdoor flow. The formal dining room is designed for grand entertaining, showcasing wainscot paneling, a decorative ceiling medallion, egg-and-dart crown molding, and exquisite millwork throughout. The renovated gourmet eat-in kitchen features top-of-the-line appliances, custom cabinetry, a large center island, and direct access to multiple outdoor dining terraces. Adjacent formal rooms-also with French doors-further connect to the resort-like grounds. The luxurious primary suite is a true sanctuary, offering 22-foot tray ceilings, hardwood floors, serene estate views, a private sitting room with fireplace, a custom dressing room, and a spa-inspired bath with soaking tub and double vanities. Four additional en-suite bedrooms provide exceptional comfort and privacy, ideal for multigenerational living or long-term guests. The expansive lower level elevates entertainment and wellness with a billiards lounge, wet bar, sound-proof private screening room, 3,100-bottle wine cellar, gym, sauna, and full bath. The breathtaking grounds include a gunite heated saltwater pool, regulation tennis court, outdoor kitchen, sweeping lawns, and multiple blue stone terraces. Additional features include a three-car garage and a Genrac home backup generator. A premier Old Brookville location close to universities, country clubs, golf, marinas, museums, farms, and premier North Shore amenities. Situated within the Award-Winning North Shore School District.