A Hollywood film producer is building the largest mansion in US history - and he wants to sell it for $500 million
McClean DesignA rendering of the soon-to-be largest mansion in U.S. history.Will Smith may be the "Prince of Bel-Air," but Nile Niami is the king.
The film producer and residential developer is in the process of building the largest home in US history on a hilltop in Southern California.
His selling price: $500 million.
The kingdom won't be completed for another 20 months, so start saving.