BEL AIR—Film producer and real estate developer Nile Niami is building a record-breaking mansion in Bel Air with an asking price of $500 million.

“The house will have almost every amenity available in the world,” Niami wrote in an email to Bloomberg.

One of those amenities will be a 5,000-square-foot master bedroom in the property’s 74,000-square-foot main residence. Other luxury features include a 30-car garage, a 45-seat IMAX-style theater, four swimming pools (including a 180-foot infinity pool), and a Monaco-style casino.

There will also be three other, smaller homes on the four-acre lot, which is located on a hilltop at 944 Airole Way. The home will offer a 360-degree view spanning from the San Fernando Valley to the Pacific Ocean, with sightlines on Beverly Hills and the towers of downtown Los Angeles.

The project’s ambitious plans required the removal of nearly 40,000 cubic yards of dirt, and will take an estimated 20 additional months to complete.

When completed, the property will be the largest mansion built in the United States during the 21st century. It will eclipse Versailles, David Siegel’s infamous 90,000-square-foot super mansion in Windermere, Florida, the subject of the critically-acclaimed documentary “The Queen of Versailles.”

The $500 million asking price is more than double the current highest price in the U.S., which is $195 million for a Beverly Hills estate known as the Palazzo di Amore. If sold for its asking price, the sale will surpass the $147 million Barry Rosenstein paid for an East Hampton estate, the current national record. The sale would also set the standard internationally, exceeding the 2011 record of $221 million for a London penthouse.

The project’s architect is Paul McClean, of McClean Design, who also designed the 14,000-square-foot home Niami sold to Tyler and Cameron Winklevoss in 2012.