Executive Plaza (74.4%) CitySpire (60.5%) Three Worldwide Plaza (54.2%) ‘Emptiest’ skyscrapers in New York City   Up to 74.4% of residents at the skyscrapers live elsewhere.   Instead, apartments are used as pieds-à-terre or investment properties.   25% of co-op and condos in New York City are not used as primary residences. The Vanderbilt (52.6%) Zeckendorf Towers (51.0%)