I suspect it really means 60+ stories in the "supertall/megatall" skyscraper category, of which there are quite a few in Chicago. Chicago is biased however, as

I suspect it really means 60+ stories in the "supertall/megatall" skyscraper category, of which there are quite a few in Chicago. Chicago is biased however, as the technology to build supertall and higher skyscrapers was invented by a Chicago architect. The same tech in the Sears/Willis tower is used in the Burj Khalifa in Dubai.