If my neighbor is complaining about installing gutters, do I have to install them? Am I legally obligated to install them?
An Illinois attorney could advise best, but your question remains open for two weeks. Until you are able to reach a local attorney, you could start some self-help research by looking into state building codes (and local ones as well, if they address the issue). If such regulations or codes exist, it might also be something that's close to home for architects who handle residential designs.
Tim Akpinar