Money ‘The One’ Los Angeles megamansion once listed for $500 million is deep in debt September 29, 2021 Wyatte Grantham-Philips, USA TODAY Comments Off on ‘The One’ Los Angeles megamansion once listed for $500 million is deep in debt With 105,000 square feet of living space, "The One Bel Air" is a Los Angeles megamansion believed to be the largest modern home in the United States.