Large country estates were traditionally found in New York's Long Island, and Westchester County, the Philadelphia Main Line, Maine's Bar Harbor on Mount Desert Island, and other affluent East Coast enclaves; and the San Francisco Bay Area, early Beverly Hills, California, Montecito, California, Santa Barbara, California and other affluent West Coast enclaves.
All these regions had strong traditions of large agricultural, grazing, and productive estates modeled on those in Europe.
An important distinction between the United States and England is that "American country estates, unlike English ones, rarely, if ever, supported the house.
[4] Today, large houses on lots of at least several acres in size are often referred to as "estates", in a contemporary updating of the word's usage.
They are distinguished from ordinary middle-class American houses by sheer size, as well as their landscaping, gardens, outbuildings, and most importantly, recreational structures (e.g., tennis courts and swimming pools).