Architecture matters:
Via lettersfromhere:
“Versailles is the partially-finished mansion near Orlando that clocks in at around 90,000 square-feet, making it what could be the largest privately-owned home in America. (The Vanderbilt’s Biltmore Estate, at 175,000 square feet is no longer a single-family residence but part of the Biltmore Co.)”
Touring the (Almost) Largest Home in America - The Wealth Report - WSJ
The current owner, a.k.a. “the seller,” says:
“‘I wanted a bowling alley for the kids and I wanted an indoor roller- and ice-skating rink, and my husband wanted a 10,000 square-foot health spa with an indoor relaxation pool and the house kept growing and we had to keep buying more lots.’
She added that they bought 10 Segways, which are still in storage, to make their way from one part of the house to another.”