This south-of-the-highway Water Mill mansion was built by designer James Michael Howard and is filled with custom details. The seven-bedroom, 8 1/2-bathroom home, which sits on more than 3 acres by Mecox Bay, is on the market for $24.95 million.

All the rooms are furnished with high-end pieces from around the world, along with customized features made specifically for the home, such as a limestone fireplace in the two-story great room.

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The foyer's floor is patterned with inlaid stone surrounding a custom staircase, which leads up to an alcove with a vaulted ceiling and circular skylight. Some rooms have inlaid ceilings with unusual patterns.

The home has a third-floor deck that opens to a 1,200-square-foot roof terrace overlooking the bay and the Atlantic Ocean. On the property are a radiant heated saltwater pool, spa, pool house, an outdoor fireplace and an apple orchard.

Martha Gundersen of Brown Harris Stevens is the listing agent.