I would recommend on listening to podcasts, and just take action

He now is threatening me with law actions.

First...congratulations on making the decision to get into the action. 

If you would like to have me review the note and make a suggestion for action, please send me the note, and the proposed contract.Commercial notes often do have have terms not found in residential contracts, such as  valid due on sale, interest rate adjustments based on the business net income and net worth, prohibition of secondary financing, to name a few, all of which can accerate the note to demand payoff.

Things like people going #2 in the toilet and not flushing it.  

Watch your drains:  What goes down the drain can have a major impact on how well your septic system works.Waste disposal:  What shouldn’t you flush down your toilet?

That tenant reports that there are an awful lot of cats in the neighborhood and they are getting into her garden beds.As a responsible landlord and concerned citizen, my course of action will be to:1.  

You need to either decide not to buy it or take action towards getting it done.  

I can not hold a tenant liable for the actions, or inactions of the post office.One thought on certified mail- sometimes the line at the post office to be serviced is... well- LONG.

The hard part will be putting thought in to action and getting that first deal.