I just found out my legal and permitted guest house ( I added a kitchen sink where the utility sink was and a small counter not legal ) is a guest room that cannot be rented and the tenants have not paid a few months rent because of this. They threatened to take me to court for the years they rented. I gave them a 3 day notice but don't want to go to court just yet. Can they sue me for past rent if the structure is legally built but not legal to rent? I'm at the end of the line and need to do something. Thanks