What are your cost per room or per sq. foot for rehab

[Jalon Scott]

I am looking to do flips & BRRRRs in the Chicagoland area. Primarily in C+ to C- neighborhoods...60619, 60620, 60636, 60637, 60638, 60609 are some areas I've been making offers. For individuals doing work in these areas what has your average cost per square foot been for your rehabs. Or the cost per room. Such as bathroom, kitchen, etc. Assuming your using a GC and medium grade finishes. I understand this won't be exact, and every house is different. I just want a way to do a quick evaluation. Anything you offer can help.