One of the biggest homes in U.S. history is rising on a Los Angeles hilltop, and the developer hopes to sell it for a record $500 million.

Nile Niami, a film producer and speculative residential developer, is pouring concrete in L.A.’s Bel Air neighborhood for a compound with a 74,000-square-foot (6,900-square-meter) main residence and three smaller homes, according to city records. The project, which will take at least 20 more months to complete, will exceed 100,000 square feet, including a 5,000-square-foot master bedroom, a 30-car garage and a “Monaco-style casino,” Niami said.

Estates with views of the Los Angeles basin are the California counterpart to Manhattan’s penthouses or London’s Mayfair manors, drawing a global cast of financiers, technology tycoons and celebrities who collect trophy homes like works of art. Around the world, five properties sold for $100 million or more last year, and at least 20 others have nine-figure asking prices, Christie’s International Real Estate reported last month.

The priciest home ever sold was a $221 million London penthouse purchased in 2011, according to Christie’s. The most expensive properties on the market include a $425 million estate in France’s Cote d’Azur, a $400 million penthouse in Monaco and a $365 million London manor.

Whether Niami can get more than double the previous record for his mansion remains to be seen.

“I’m skeptical,” said Jonathan Miller, president of appraiser Miller Samuel Inc. and a Bloomberg View contributor. “My first reaction is laughter. But we’re in this perpetual state of surprise as new thresholds are broken.”

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http://www.bloomberg.com/news/articles/2015-05-26/california-dreaming-record-500-million-tag-on-l-a-home