By Keith Larsen The 1,000-room Diplomat sits at 3555 South Ocean Drive in Hollywood is the second-largest hotel in South Florida, after the Fontainebleau Miami Beach. The property is reportedly on the market for as much as $1 billion, or $1 million per key, according to Bloomberg. Thayer paid $460 million for the Diplomat in 2014. Shortly after the sale, the former Westin hotel was rebranded to Curio, a Hilton Worldwide Holdings brand. … Many developers are looking to refinance…