There can’t be more than one. Manhattan’s Central Park Tower on 57th Street will be the tallest residential building in the world when it’s finished. At 131 storeys and 1,550 feet, it would be the tallest building in New York City – if it wasn’t for the spire on top of One World Trade Center. When it’s completed in 2020, the tower will be home to a seven-floor Nordstrom and condominiums on the top.