The traditional Shelter Island home is a tiled, 19th century, Maine-style home," says Nick Brown of Sotheby's International Realty-East Hampton brokerage, the listing agent for the island's second most expensive property.

The 6,006-square-foot behemoth is located 100 miles east of Manhattan, just off Long Island, and can be reached by seaplane, helicopter or ferry.

The house, known as the Snyder House, was designed in 1952 by Bauhaus-trained architect Bertrand Goldberg for steel magnate John Snyder.

It has six bedrooms and four bathrooms.

"When it was built, it was considered futuristic," says Brown.

And these days, it's a rarity.

"There are very few pieces left (by Goldberg) in terms of residences," Brown explains.

The sellers are the third owners of the house, who bought the place in 2000. Their two-year restoration struck an impressive balance of respecting the home's original features - the stone floors and eight-flue fireplace remain - while adding modern upgrades.

"They've really brought the house into the 21st century," says Brown.

Air conditioning, radiant floor heating, a walk-in closet in the master bedroom, a media room and a yoga studio were all added.

One of the home's bedrooms has a private entrance and bathroom, which is ideal for any household staff, Brown said.

The kitchen with chef-grade appliances and open dining and living areas is an entertainer's dream.

The property includes a private beach and a heated salt water pool that was completed just a year ago.

There is also a two car garage and an almost fully glazed covered porch which brings in lots of natural light.

The home also features a rare amenity: a 235-foot deep-water dock.

"It was originally designed for seaplane use," says Brown." You can have multiple boats."

Happily, the home's location makes it easy to cruise around the area on any watercraft.

"You can sail right through and go to Sag Harbor for dinner," says Brown.

The house sits on 3.4 acres with views of West Neck Harbor and Long Island Sound.

Brown notes that the property has plenty of room to expand in the future.

And for this once-sleepy, Hamptons-adjacent resort, construction may be in the future. According to Brown, Shelter Island is "catching up" to the South Fork of Long Island, including the Hamptons area.

"Many hotels and restaurants have recently undergone renovations," he said.

The island has long been a summer resort, but year-round residents and long-term visitors are becoming more common in this tranquil outpost.

"Shelter Island is getting very hot," Brown said." We have a lot of interest from buyers from abroad. Europeans love Shelter Island."