I purchased my commercial build in March of 2003 and its in a unincorporated area, I had asked all my neighbors if they needed a permit to do there buildouts they all told me no . My buidout has been done since 2003 it there a limit of how far back the they could hold me to permits. I had done this buildout without any permits or inspections. I’m also a contractor so I built everything to code. I have to call the Will county land use department enforcement inspector.
Thank you for your question. In theory, they can look back for an unlimited period of time. Could you provide me with more detail? At@tracyfirm.com