Hedge fund billionaire Ken Griffin has revealed plans to create the world's most expensive home - a $1 billion mega-estate just a quarter mile south of 's Mar-a-Lago.The 55-year-old tycoon has recently turned heads by acquiring more than 20 acres of in his home state of , adding to his around the world. But what makes this one different is the fact it's projected to be worth $1 billion upon completion, making it the most pricey mega-mansion in the world.
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