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 and set on 4.5+/- acres of impeccably manicured, estate-quality grounds, offers nearly 10,000 sq ft of finished living space across all levels. Step inside to a stunning entryway with soaring ceilings and a grand double-height foyer that introduces elegant formal living and dining rooms appointed with intricate millwork, refined finishes, and multiple fireplaces. Throughout, the residence exemplifies timeless architecture, sophisticated detailing, and modern luxury. The gourmet eat-in kitchen features top-of-the-line appliances, custom cabinetry, a large center island, and direct access to outdoor dining terraces. Adjacent family and formal rooms with French doors create seamless indoor-outdoor flow to the property's resort-style amenities. The luxurious primary suite is a true sanctuary, offering hardwood floors, serene estate views, a private sitting room with fireplace, 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. The expansive lower level elevates entertainment and wellness with a billiards lounge, wet bar, private screening room, 3,100-bottle wine cellar, gym, sauna, and full bath. The breathtaking grounds include a heated saltwater gunite pool, regulation tennis court, outdoor kitchen, and sweeping lawns. Additional features include a three-car garage, full-house generator, and a grand fountain behind wrought-iron gates. 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.