As international billionaires get nervous, sales in L.A.'s ultra-luxury housing market slow

A cooling market for the most expensive homes is costing hotel and casino magnate Steve Wynn some money.

Two years ago, Wynn paid $16.25 million for an 11,000-square-foot mansion perched on nearly an acre above the Bel-Air Country Club. Less than a year later, he sought to unload the home with...