The NBC Tower in Chicago is interesting as a postmodern skyscraper that models itself after an Art Deco building.  Completed in 1898, It is 627 feet high and 37 stories.  

    The AT&T Corporate Center at the corner of West Monroe and South Franklin in Chicago was completed in 1989.  Made of granite, it is 60 floors tall, standing 1007 feet high.  The architect was Adrian D. Smith of Skidmore Owings & Merrill LLP.