4. Four Fairfield Pond
Located in Sagaponack, NY, this estate belongs to Ira Rennert, an American investor, and businessman. This beachfront estate consists of 29 bedrooms, 39 bathrooms, and 3 swimming pools with a power plant on the estate. Other features consist of a basketball court, bowling alley, squash court, and a 91 feet formal dining room. It is valued at $248.5 million.