There are no star maps on Palm Beach, and many of its biggest estates are hidden behind elaborate landscaping. To learn what belongs to whom, and how much it cost, a guide is needed, and Dana Koch, who has been selling real estate here for 22 years, knows the area cold. He’s a veteran docent in a zoo where the creatures are billionaires and it’s difficult to see the cages.

“Howard and Beth Stern live here,” he said, pointing to a gate flanked by shrubbery. “This whole place, he paid about $50 million for it years ago. Now it’s worth $200 million.”

On it goes, an inventory of rich and famous people, a patter that rambles along, like Mr. Koch’s car, at about 10 miles an hour. Jon Bon Jovi lives there. That’s where Roger Ailes slipped in the shower and died. William Lauder built this, after buying Rush Limbaugh’s place for $155 million and tearing it down.

Some homes are identified by job (N.F.L. owner, sugar magnate) others by names, (Dr. Oz, Tom Ford, Charles Schwab). That lot once belonged to Jeffrey Epstein, whose place was razed. A new house is under construction, and the owners, Mr. Koch speculates, are going to apply for a new address.

These have been busy months for Mr. Koch, 52, who is not related to the famous Republican donors. (“Same name, different bank account.”) Palm Beach is, of course, home to President Trump’s private club, Mar-a-Lago. After the election in November, there was a “Trump bump,” with $100 million worth of property on Palm Beach going under contract in the span of a week. Late last year, the Fox News host Sean Hannity purchased a $23.5 million mansion in nearby Manalapan, then spent $14.9 million on an oceanfront townhouse in Palm Beach in January. (He’d previously spent $5.3 million for a townhouse here in 2021.)