The property includes a a 75-foot-long heated pool with a hot tub and a pool house. Called Copper Beech Farm after the large copper beech trees on the property, the Greenwich estate once belonged to the Lauder Greenway family—Harriet Lauder Greenway’s father helped Andrew Carnegie start what would become U.S. Steel—and dates back to the 1890s, according to the property’s listing agent, David Ogilvy, of David Ogilvy Associates, an exclusive affiliate of Christie’s International Real Estate. The current owner is timber tycoon John Rudey, according to public records. Mr. Rudey, who knew the Lauder Greenway family, bought the property quietly 28 years ago, Mr. Ogilvy says, adding that the owner is selling because his children have grown.