What is the largest privately owned mansion in the United States?
1. Biltmore Estate (Asheville, North Carolina): 175,000 square feet. The Biltmore Estate isn't just the largest privately owned house in the United States — it blows the competition out of the water.
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Though the family stopped living in the mansion in the 1950s, it is still owned and run as a tourist attraction by the fourth generation of Vanderbilt descendants.