A good point from the Sun Times...

"Not a good location
Wait until the first kid gets lost on the second or third level of Randolph, and then see how many people still want the Chicago Children's Museum located in Grant Park."

http://www.suntimes.com/news/commentary/back/587883,CST-EDT-talk04.article

Or the garage itself.. since they will be loading and unloading in the garage. Or maybe they would decide it's easier and safer to do it on Upper Randolph like the Bears busses.
Eric