Chicago State has a horrendously bad reputation as an undergraduate school. I think a lot of that bleeds into their reputation as an OT program. Whether or not that's fair, I have no idea, but CSU has a generally bad reputation in the Chicago area and they've been on the verge of losing their accreditation a university more than once.
For what it's worth, I've heard specifically from former faculty that CSU 1) puts up a lot of barriers to the success of their students 2) has a really bizarre dress code within the OT department. The first one is probably more important than the second, but, still throwing it along as an FYI.