Maybe I am harsh but I would give the proper notice for your state and send a non renewal notice.

He most likely abused the plumbing system letting hard waste going through the line and most probably used harsh chemicals such as drainex causing these issues.

A website is a good starting point, but there is no substitute for real world experience.Don't take this as harsh.

This may sound harsh but it could cost you $10’a of thousands of dollars.

I have seen both too harsh removal (which I agree with you that your post does not seem very self promoting) and not harsh enough removal (typically turnkey providers that are advocating turnkeys where they are providers).if I was a moderator I would error on the side on not removing posts that are not clearly in violation.As to your question on good markets to market, I only know that San Diego seems to have a lot of competition. 

This seems a big harsh, but there is some truth to it.

All, harsh constructive criticism is welcome!

.: That's a little harsh, considering you don't know the extend of the damages.

That license fee spread out over multiple properties isn't so harsh. 

Harsh weather environments go into their risk assessment model.It can be true that more mom and pop tenants even if they pay on the lease for everything can have a shock to their business with large increases.