4. Four Fairfield Pond – $248.5 Million
This may be the ultimate example of luxury and self-sufficiency since this property has its very own power plant. It boasts 29 bedrooms, 39 bathrooms, a bowling alley, tennis courts, squash courts, a basketball court, a dining room that is over 90 feet in length, three swimming pools, and more than 100,000 square feet of interior space. It sits on a generous 63 acres or property in Sagaponack, New York and is owned by Ira Rennert, a businessman and successful investor who has interests in metals, mining, industrial fixtures, and manufacturing.