Name: Ira Rennert
Occupation: Founder of Renco Group
Location: Sagaponack, NY
Square Feet: 66,000 / 110,000 (including outbuildings)
House Name: Fairfield

This obscenely gargantuan mansion, dubbed Fairfield, is reportedly the largest occupied residential compound in America. It is situated on 63 prime acres and houses 29 bedrooms and 39 bathrooms. It also has a dining room that stretches 90 feet long, a bowling alley, two tennis courts, a squash court, a 164 seat movie theater, and a 200 car garage. This home also contains a rather rare item; its own power plant. Fairfield is currently valued at more than $185 million.