Who owns the largest place of residence in the U.S.?

Question

Who built or owns the worlds largest single family residence in the United States?

Answer 1

Baltimore House is Americas largest single-family residence(109,000-square-foot ). The size of the living space in the house is about 4 acres and it is the largest private residence in the U.S. It was built by George Vanderbilt who inherited a vast fortune. His grandfather Cornelius amassed the unheard of $150 million in shipping and railroads. Cornelius' son doubled the fortune to $300 million which in today's money would be worth about 90 some odd billion if I heard the tape correctly. But they had no sinks in the 43 bathrooms even if they had the then new commodes.