Location: Bridgehampton, N.Y.
Price: $43.5 million
Square footage: 31,000
The Sandcastle served as a summer rental for the first lady and gentleman of pop, hip-hop and the Brooklyn Nets. They are reported to have paid $400,000 to rent the place for August 2011.
The mega mansion, built by Hamptons developer Joe Farrell on 11.5 acres, has a lot going on, including a heated granite pool with an underwater stereo and a master suite with 2,800 square feet. The lowest of the three-level home is the Air Lounge, with a futuristic two-lane bowling alley, full bar and disco, rock climbing wall and full spa. The "recreation pavilion" also features a skateboarder's half pipe.