Aon Center - out of Legos
Recently, we joined our kid's cousin at his birthday part at the Lego Discovery Center up in Schaumburg where they have a couple of rides a show and other assorted Lego-related things. The first room you enter is a LEGO layout of Chicago and includes some signature members of our skyline including the building I work in: the Aon Building.
There are a few touchscreens around the layout that give you the details on the various buildings. Here's the screen for the Aon Center:
91K bricks. Holy moly.