BASEMENT EGREES WINDOW

Does anyone know if Chicago has a code addressing egress windows for rehabs. I know the older buildings never had a requirement, but what about a rehab. This last one had all glass block windows and they put basically put a master bedroom suite in the basement.

IRC 310.1 requires egress (door or window to exterior) and the below basement guy in IL agrees:

http://www.seepage.com/services/residential/basement-egress-windows

Would not the rehab have required a permit? If not maybe it did not invoke new codes. However, if they changed the use of the basement to a sleeping room that would certainly invoke the egress requirement.

Even if old I'd still recommend egress be installed as we are smarter now and we know people get trapped in these basement bedrooms, the reason egress is now required.