Experience the most exclusive property on the North Shore at The Mallows, a historic waterfront masterpiece in the prestigious Head of the Harbor Village. Designed by renowned architect Charles Platt for the esteemed Astor family, this iconic estate spans over four acres of impeccably manicured grounds with more than 300 feet of private beachfront. With breathtaking west-facing sunset views over Stony Brook Harbor, extending to the Long Island Sound and Connecticut, this rare offering epitomizes luxury and exclusivity. Seamlessly blending historic charm with modern elegance, this estate offers resort-style outdoor living with a heated saltwater pool, hot tub, private tennis court, and a picturesque waterfront gazebo. A cobblestone driveway, sprawling limestone patio, chicken coop, and lush vegetable garden complete the outdoor oasis, perfect for grand entertaining or quiet relaxation. Inside, the stately residence boasts 11 bedrooms, 5.5 bathrooms, and 14 fireplaces, including a 3-bedroom guest cottage. Sophisticated craftsmanship is showcased through 9.5-foot ceilings, intricate custom millwork, and a refined library. The home is further enhanced by a three-level elevator, a stunning glass conservatory off the primary suite featuring Marvin hurricane-proof windows and doors, and a four-season glass room off the family room, offering panoramic views year-round. Designed for both comfort and grandeur, the chef’s kitchen is outfitted with Viking appliances, a gas stove, and a Sub-Zero refrigerator, positioned next to an expansive dining room ideal for elegant entertaining. Perfectly located within walking distance to the Stony Brook Yacht Club, Avalon Nature Preserve, and Stony Brook Village, this one-of-a-kind estate provides easy access to the LIRR, North Shore beaches, and the award-winning Three Village School District. A true masterpiece of luxury and exclusivity, The Mallows represents a once-in-a-lifetime opportunity to own the most prestigious property on the North Shore.