This custom-built Montauk home listed for $2.6 million is on Lake Montauk.

The lot, more than an acre, includes a four-bedroom, three-bathroom home with outdoor decks overlooking the water.

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“It’s a great place to go and switch off,” says homeowner Susan Aboaf, who renovated the home in 2014.

The upper floor of the “upside-down” house contains the living room, kitchen and dining area. Downstairs reside the bedrooms.

There are hardwood floors and central air-conditioning.

The home is listed with Lois Moore and Peter Moore of The Corcoran Group.