Illinois’ richest man, Ken Griffin, to build on his $130 million-plus Palm Beach, Fla., estate. And an existing 21,350-square-foot mansion, worth an estimated $6 million, will be demolished to make way for Griffin’s new home. It's longer than a football field and contains 33,500 square feet of oceanfront living space — but what will soon be one of the biggest houses in Palm Beach, Fla., has planning officials scratching their heads. How come the Tahitian village-inspired home that Illinois' richest man is building on his $130 million-plus estate is so small? It "defies logic" that Citadel hedge fund titan Ken Griffin,...