Please do us a favour, since two of you insist there are post-modernists buildings all along the river in downtown Chicago, in your next post(s), preferably as a footnote to a customary post here, name say five of them, so I know what qualifies in your estimation, or someone you trust, as post-modern.
I have a map, and a pretty good memory of what is there now, since I go to an office just off the river on a regular basis when I am in Chicago. I will use your information to determine what may or may not fit, and post my result, also in a footnote (with a location to find the detailed tally elsewhere).
Given your certainty, I don't believe this will be a difficult task for either or both you to muster in the near term. I must confess, if I were given this same task, it would be difficult for me to do the same.