20-room estate in Mill Neck listed for $17.4 million

A 12,000-square foot chalet-style estate on 7.8 acres in Mill Neck is on the market for $17.4 million. The annual property taxes are $174.527.

Built by Gallagher Homburger Gonzales Architects in 2013 and dubbed Chateau Sur L’Etang, which means Castle on the Pond in French, the home boasts three floors of living space, seven bedrooms, nine full and two half baths, a marble-floored foyer with a double staircase with wrought-iron filigree railing over Brazilian cherrywood steps, marble and Brazilian cherrywood floors, custom moldings and grilles, a hydraulic elevator, radiant heat and smart home systems.

Including the finished basement, the house is 23,000 square feet, notes Nancy Moinian of Laffey Real Estate, who is listing the home with Spencer Ting of Corcoran Group.

The basement features 10-foot ceilings, a kitchen, living room, two dining rooms, a 2,000-bottle wine cellar, 12-seat home theater with an illuminated bar, billiard room, gym and sauna.

On the main level, there’s an Olympic-sized indoor swimming pool and spa tub surrounded by limestone walls and a glass solarium ceiling.

“I’ve been doing this for 25 years and I’ve been doing luxury for 25 years, and this is one of a kind, truly,” says Moinian.

The house, on Horseshoe Road, was constructed with walls made of 16-inch reinforced concrete and steel decks, double steel beams and concrete layered on each floor, to create stiffer floors that exceed standard building code, said Steve Homburger, of the Commack architecture firm that built the home.

The heated garage, which currently holds four cars, could accommodate a total of six with a lift.

Zoned for the Locust Valley Central School District, the property includes an outdoor pool, pond, state-of-the-art greenhouse and terraced, landscaped gardens.