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AInside the world s skinniest skyscraper on Billionaires Row in NYC Business Insider bevy of super-tall, glossy skyscrapers is rising along New York City's Billionaires' Row, an area south of Central Park that's home to some of the most expensive real estate in the city.

There's Central Park Tower, which recently became the tallest residential building in the world. Then there's 220 Central Park South, which broke real-estate records when billionaire hedge fund manager Ken Griffin paid $238 million for a spread of condos. Both towers are expected to be finished sometime in 2020.