I have a friend who rent his basement to a guy, he doesn't pay the rent, even more worse, that guy complaint to govenment that my friend illegial rent out the basement. so govenment sent inspector to check on his house and ask him removing his basement kichen in spite of the kichen was decorated by pre-owner.
so now what my friend can do to protect himself, as the guy is still living in his basement without payment any rent, and in another side, inspector told him that he couldn't rent out basement and asked him remove the kichen for later further inspection.

please somebody give some ideas to help him?
thanks in advance!