A New York judge’s Tuesday ruling valuing Donald Trump’s sprawling, headline-making Florida estate at $18 million has left industry experts perplexed. In his verdict, Manhattan Supreme Court Justice Arthur Engoron delivered a bombshell ruling that the former president committed fraud by inflating the value of his wealth, with details including the monetary value associated with Mar-a-Lago in Palm Beach. This decision, which came down without a jury, has sent shockwaves through political — and real estate — circles, especially that $18 million base value for the property. One prominent Palm Beach real estate broker, speaking on the condition of anonymity,...