Before Palm Beach’s most famous turn-of-the-20th-century mansion — Henry Flagler’s marble-pillared estate — opened as a museum in 1960, it operated for years as something else entirely.
A hundred years ago this month, what had been an ultra-exclusive opportunity — an overnight stay as a guest at Flagler’s commanding waterfront manse — became accessible for a price.
That’s because after the 1913 death of the Standard Oil partner, railroad tycoon and Florida developer, the property became a hotel with the opening of an attached and towering 300-room addition…