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British billionaire James Dyson just closed on a 9,138-square-foot penthouse at 520 Park Ave. The vacuum mogul paid $73.8 million, according to sources familiar with the deal. “It doesn’t get any better,” said developer Arthur Zeckendorf. “We have more than exceeded our expectations.” The six-bedroom penthouse comes with a 279-square-foot balcony and 360-degree city views....