I dont know how much you have been researching and education yourself but a book that taught me lots was ABCs of Investing in Real Estate, ABCs of Buying Rental Properties, and Tax Free Wealth why Tom Wheelwright.

I would argue that a SFH with a guest house is 2 units. 

Is it worth arguing with the tenants? 

He stopped trying to argue the lease and I haven’t heard from him since.I had to stop by the rentals yesterday to see if the lawn needed to be cut, and I noticed that his car and outdoor decor were gone.

He argued that the plumber can't file a lien, because he signed a lien release when he paid him the downpayment.

In fact I would argue Tom Brady is the real victim in all of this.  

Can one find loop-holes to argue against, sure, but at what cost?

I don't want phone calls from a helicopter mom arguing that her little boy's air conditioning isn't cold enough.

If they want to argue or complain, we just tell them to talk to City Hall.We do allow pets, in fact, all 10 of our rentals currently have pets, but we meet them before approval.

My family argued that what I am doing is not a real job, then they saw I stopped going to the terrible job, and started complaining, so my inventory to provide the products has filled up my 10 x 10 room, half of the other room, and part of the garage.