4000 is the tallest tower in City Square, and has been noted on the List of tallest buildings in Phoenix, which lists 25 Skyscrapers in the city. Businesses inside 4000 Tower include Arizona Drug Screening & Investigations, First Community Financial Corporation, and Parsons & Goltry Law Firm. 4000 Tower is on the north side of Clarendon Avenue, whereas both 3800 and 3838 are on the southern side.
