Originally conceived as the Laguna Project, 9 Margarets is an AIA award-winning modern residence on Shelter Island that brings together architecture, light, and exceptional indoor-outdoor living across ~5,530± SF of thoughtfully designed space, including a substantial finished lower level. Offering 4 en-suite bedrooms, 5 full baths, and 1 half bath, the home is defined by vaulted, light-filled interiors, seamless flow, expansive glass, curated materials, and a striking two-sided fireplace that strengthens the connection between indoors and out. A chef's kitchen with top-tier appliances anchors the living and dining spaces, while custom millwork and refined finishes elevate the home's disciplined architectural approach, developed in collaboration with Sean Murphy and James Merrell. All bedroom suites open directly to the outdoor setting, reinforcing the property's resort-like atmosphere. Outside, a 50' x 17' heated saltwater gunite pool is framed by expansive decking, multiple lounge and dining areas, a pool house with full bath, outdoor shower, and mature landscaping that balances privacy with openness. Set on a quiet, tree-lined street moments from Shelter Island's restaurants, marinas, beaches, and ferry connections to Sag Harbor and the North Fork, the residence is architecturally significant, refined, and distinctly Shelter Island.