Imagine playing tennis on the roof of a home in the Hamptons, with 180-degree views of Mecox Bay and Flying Point Beach.

Architect Philip Rossillo and builder John DeVito have turned what initially sounded like a fanciful idea into an exotic reality in Water Mill, at this newly constructed house listed for $21.9 million.

The tennis court sits atop the home's steel roof structure overlooking Mecox Bay and Flying Point Beach. A staircase and elevator from the main hallway lead directly to the court, opening onto a pergola that provides spectator seating and shade for players.

The court is oriented north-south to minimize the effects of the sun. Wetlands on the property only allowed for a less desirable east-west orientation on the grounds.

Rossillo describes the spec build as "overdesigned" to support the 52-by-110-foot court overlaying the house.

Steel framing runs through the entire house and supports a six-inch concrete slab that is sunken into attic space directly above the second floor ceiling. Rubberized membranes cover the concrete, and a multilayered resilient cushioning system forms the surface of the court, which is painted in a traditional red clay color.

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The steel roof structure is supposed to counteract vibrations and the sound of players, and supports 100 pounds per square foot versus the usual 40 pounds, says DeVito. "You could land a helicopter on it," he says.

A mahogany brise-soleil, or sunshade, extends from balconies on the second floor. Nine-foot-high walls on the other three sides complete the perimeter.

The court cost $1 million to build, DeVito and Rossillo say.

During a recent test, nine of 10 balls stayed on the court. The angle at which they hit the walls helped contain most of them. Of course, some will inevitably fly off. But elaborate netting, for example, would have compromised the aesthetics. "You better have a lot of balls," warns DeVito.

ADDRESS: 100 Crescent Ave., Water Mill


ASKING PRICE: $21.9 million


PROPERTY SIZE: 2.1 acres

THE BASICS: Seven bedrooms, eight bathrooms, one half-bathroom

OTHER FEATURES: Dock, 9,000 square feet of mahogany decking, stone patios, infinity pool with 10-by-20-foot spa, theater, wine room, gym, elevator

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LISTING AGENT: Linda Haugevik, Douglas Elliman Real Estate, 631-838-2247.


LATTINGTOWN: This four-bedroom house is listed for $2.195 million. The five-acre property includes a tennis court and a heated gunite pool with a waterfall and a cabana. Margaret Trautmann, Daniel Gale Sotheby's International Realty, 516-759-4800.

SETAUKET. The four-bedroom ranch is on the market for $499,000. There is a tennis court on the .91-acre lot as well as a gunite pool. Scott Sanders, Shea & Sanders, 631-360-0004.

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WOODBURY. The 1.03-acre lot of this Woodbury home has a tennis court. There is also a heated pool and a built-in barbecue. Sheila Gatto, Realty Connect USA, 888-236-6319.