Many complain that McMansions are unreasonably large for a single-family home, but McMansions have nothing on what is reportedly the largest home in the U.S.

Located in Sagaponack, NY, this massive waterfront compound was built on 63 acres. Construction began in 1998 and was completed in 2003, but not without an outcry from the local community, many of whom believed it would be used as a hotel, business retreat or religious center.

Not so. Instead it was built for self-made billionaire Ira Rennert and his family. Rennert, who has large holdings in the industrial sector, commissioned the home to be built for his personal use.

Located at 281 Daniels Ln Sagaponack, NY 11963, the actual square footage and number of bedrooms and bathrooms vary, depending on source. Living space ranges anywhere from 43,031 to 100,000 sq ft; bedrooms vary from 21 to 29 bedrooms and bathrooms are equally difficult to pin down, ranging from 18 to 49. At Zillow, we get our data from public records and our facts show 21 bedrooms, 18 bathrooms and 43,031 sq ft. Discrepancies in data can also be attributed to whether other buildings on the estate are included in the numbers.

One thing is certain: this is one, big house. The aerial image below shows a portion of what’s on the property, but in addition to the main home is an indoor theater, two bowling alleys, two tennis courts, two squash courts, game rooms, and a basketball court.

(Photo of Rennert courtesy of Dan’s Hamptons)

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