Dating back to 1833, this Sag Harbor home, which now has four levels and almost 10,000 square feet of living space, is listed for $19.75 million.

The original portion was built in the Greek Revival style and was renovated and enlarged in an ornate Italianate style in 1850. A 2014-15 renovation added vintage and antique period lights, new utilities, new heating and air-conditioning, and more closets. "In 1833, you only had trunks or armoires," says owner and broker Richard Demato of Brown Harris Stevens.

Modern conveniences can also be found in the basement of the seven-bedroom house with eight bathrooms and a half-bath.

Equipped with large windows, a wine cellar that holds about 3,000 bottles, a media area, gym, pool room, two full bathrooms and a second kitchen -- equipped with Sub-Zero refrigerators and two dishwashers, but no stove -- it's more like a wing of its own than a sublevel.

"You don't have to leave the basement too often," Demato says.

In the second kitchen, food can be prepped and sent upstairs by elevator for parties, freeing up the main kitchen for mingling.

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There are seven fireplaces in the house, as well as grand parlors, covered porches, high windows and a third-floor loft with a bathroom. The loft leads to the widow's walk, which has views of Sag Harbor.

A newly added swimming pool, surrounded by landscaping designed by Marders Landscaping in 2009, includes "a lot of exotic plant life, walking paths and a gunite pool surrounded by plantings," Demato says. A brick patio features a gas barbecue with a dedicated line.

The climate- and humidity-controlled four-bay garage includes an art studio, a bathroom with a shower and a mini-kitchen, and is ideal for storing art, says Demato, an art collector whose RJD Gallery specializes in contemporary art with a focus in narrative portraiture, imaginative realism and contemporary landscape.