This modern beach house in Water Mill has 100 feet of direct Atlantic Ocean bulkhead waterfront, as well as 55 feet and a dock on Mecox Bay on a separate wetland parcel across the street. It is listed for $13 million.

The home has stone steps that lead to the cantilevered front door of the cedar-clad five-bedroom, three-bath residence designed by Stelle Lomont Rouhani.

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Inside the 2,400-square-foot home, multiple ocean-facing spaces on the first floor, including the living room, kitchen and two bedrooms, have floor-to-ceiling sliding glass doors to the outdoor deck, which has a covered outdoor dining area.

“It’s a very open kitchen. You can sit there while you’re preparing meals overlooking the ocean and the bay,” says listing agent Harald Grant of Sotheby’s International Realty. He is co-listing with Lynda Packard, of Douglas Elliman Real Estate.

Upstairs, the master bedroom suite, which opens through large sliding glass doors to a private ocean-facing deck, has a walk-in closet and a skylight-equipped full bath. A pair of bay-facing bedrooms and the family room share a full bath.

A second-floor wraparound mahogany side deck — the home’s third — can be accessed from the master bedroom suite as well as sliding doors along the interior staircase. It is equipped with a fireplace, hot tub, and exterior stairs connecting to the beach and private oceanfront access. An outdoor shower is tucked underneath the staircase.

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The property is landscaped with native sea grass, Grant says, and the Mecox Bay dock, which is set on a separate quarter-acre wetland parcel, can accommodate a jet boat or a jet ski.