Billy Joel is selling his waterfront estate in New York that he once could only dream of owning.Berkshire Hathaway HomeServices/Laffey International RealtyBilly Joel is selling his massive waterfront estate in Centre Island, New York, for $49.9 million.The 26-acre estate has four distinct houses and over 2,000 feet of private beachfront.Joel first saw the estate when he was a young man and dreamed of one day owning it.Billy Joel is moving out.The "Piano Man" singer and lifelong New Yorker is selling his massive waterfront estate in Centre Island, New York, after completing a five-year renovation project.The property, on the market through Berkshire Hathaway, could fetch close to $50 million.Known as "MiddleSea," the estate spans 26 acres and has over 2,000 feet of private beach access, four separate homes, two swimming pools, and views of Long Island Sound.Aside from the luxurious amenities and square footage, MiddleSea also has quite the backstory.The New York Times reported that Joel first spotted the waterfront estate as a teenager while harvesting oysters to earn extra money to support his working-class family."I'll never live in a house like that," he said that he thought to himself at the time, The New York Times reported.He was wrong.