A surge of ultra-rich buyers has pushed asking prices to new extremes, yet many headline-grabbing megamansions languish on the market or trade for a fraction of their debut numbers.

Unlike most agents who measure success by zip codes, Sarkie Ampim measures his by continents. With a worldwide audience of ...

It's "nobody's market" right now, according to celebrity real estate broker and agent Ryan Serhant, who reveals the hidden ...