Now reduced below construction cost, this amazing 11,500 sq. ft. new construction on 3 acres is tucked away on a gorgeous waterfront street, a cul-de-sac of $5-$15MM homes. The home sits proudly on a knoll, across from Shelter Island Sound and Ganet Creek, for gorgeous winter water views. Originally budgeted to sell at $7MM, the house is now listed at $4,999,000, under $435/square foot and priced to sell. The outside features shingle-style architecture, while the inside surprises with stunning modern finishes. A massive 2-story foyer with tasteful millwork connects the open spaces of the first floor, which boasts a 4,250 sq.ft. There is tremendous open flow connecting the living room and great room (separated only by see-through fireplace), designer kitchen, breakfast room, and formal dining room with open wetbar and glass wine cellar. A massive Junior Master, 3-car garage with mudroom, plus pool bath round out the first floor. Choose between a grand staircase or elevator up to the second floor, where 5 ensuite bedrooms and living room/office spread out over 3850 square feet. The master suite is spectacular, spanning front to back to take advantage of the winter water vistas and westerly back yard views. The suite features a private living room with wet bar, two fireplaces and dream master bath, with dolomite and grigio marble appointments including 5" vanity counters, 2 showers and 2 water closets. A finished walk-out lower level adds 3400 sq. ft., including open living room/game room, gym, future theater, 7th ensuite bedroom and second laundry. Outside, the property offers a 50 x 20 pool with hot tub and retractable cover, 3 community tennis courts (two doors away) and a bay beach to leave your kayaks or paddleboard all summer. This waterside North Haven location, near Sag Harbor's bustling town and excellent schools, offers total serenity on 3 acres at the end of a quiet cul de sac. This new construction is not only ripe for enjoyment, but also price appreciation as Sag Harbor continues to explode in popularity.