Nestled gracefully on 11.5+/- acres of prime Hamptons landscape south of Bridgehampton's highway, 612 Halsey, known as "Sandcastle," epitomizes the ultimate Hamptons resort estate living. The centerpiece is a sprawling main residence spanning over 17,000 square feet, featuring 12 bedrooms, nine full bathrooms, and five half baths-providing both ample space for relaxation and a grand venue for entertaining. Upon entering the magnificent foyer, guests are greeted by an elegant formal living room and a gourmet chef's kitchen that doubles as an entertainment hub. A secondary prep kitchen, butler's pantry, wine room, and multiple seating areas further enhance this culinary haven. An exquisite formal dining room showcases intricate craftsmanship. The main level also houses a walnut-clad library, a private ten-seat theater, a mudroom, a screened porch, and expansive covered porches, seamlessly blending indoor and outdoor living. The second level unveils an extraordinary 2,000+/- square foot master suite, along with five en-suite guest rooms, an upstairs living area, and a separate two-bedroom guest apartment. The lower level offers a paradise for active enthusiasts with squash, racquetball, basketball, volleyball, a two-lane bowling alley, climbing wall, and skateboard half pipe. A gym, virtual sports simulations, a club area with a DJ booth, a private spa with a fireplace, and two additional bedrooms cater to varied interests. Outside, a resort-like oasis awaits, featuring a sunken tennis court, a 20' x 60' pool, an oversized hot tub and a basketball court. An expansive outdoor kitchen caters to culinary desires. The 2,400+/- square foot pool house accommodates various activities with its studios, 4 bedrooms, 2 full baths, and kitchen facilities. In essence, 612 Halsey stands as the epitome of a Hamptons resort estate, promising an unparalleled living experience in this coveted enclave.