A 1949 cape-style house on a canal in Amityville is listed for $439,000 and comes with an unexpected addition: The rear of the house, which is in contract, has a curved, two-story extension.

It features rows of windows and has a sunroom on the first floor. The second level contains a home office that leads to a rooftop patio above an attached two-car garage. It is not known whether the extension was original to the home, says Traci Gazzo, listing agent with Coach Realtors.

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The owners did some remodeling after superstorm Sandy after a three-foot crawl space beneath the house flooded, bringing a foot of water into the main level. Spanish porcelain tile floors were installed and the eat-in kitchen was opened up to the dining area, Gazzo says. Damage to the 44-foot bulkhead also was repaired.

There are three bedrooms and two bathrooms. Other features include a great room with an exposed wood-beamed ceiling, radiant heated slate floors and a fireplace. A second fireplace is in the master bedroom.