At $250 million, a new mega mansion in the exclusive Bel Air neighborhood of Los Angeles is the most expensive home listed in the United States. The passion project of developer and handbag tycoon Bruce Makowsky, the four-level, 38,000-square-foot mansion built on spec includes 12 bedroom suites, 21 bathrooms, five bars, three gourmet kitchens, a spa and an 85-foot infinity swimming pool with stunning views of Los Angeles.