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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At 109,000 square feet, OHEKA was and remains the second largest private home in America (only the Biltmore in North Carolina can boast grander dimensions). Construction: Reinforced steel and concrete with some walls 2'6” thick. OHEKA originally consisted of 127 Rooms.