ChiTownAds.com Online Library
-  
Chicago Information: Real Estate, Things To Do, Relocation Consumer Guides & More! If your moving to Chicago or just visiting we have the information you need.
Two domed entrances, one with skylights, were added to the Sears Tower in 1984 and 1985. A 106-cab elevator system (including 16 double decker elevators) divides the Tower into three separate zones, with skylobbies in between.