Then if it isn't paid, you have unpaid rent and take action accordingly like you would for any other unpaid rent situation.

It all depends on the situation.

Make sure you situate (if you plan to) prior is crucial.

I would follow-up with a letter as others have stated, but if no action was taken I would trim off any branches that over hang my property eliminating my own liability in the situation. 

You alluded to the "bad" interpretation, as this would be pointing to an oversupply situation pushing rents down.

You haven't given many details so it's difficult to give you a quality answer for your situation.

It’s unlikely to provide the immediate tax write-off you're envisioning.I’d recommend consulting a CPA to clarify your situation, especially if you’re splitting usage between personal and rental.

That’s before factoring in utilities or each personal situation.

Any thoughts is you were in this situation?

Given your situation, one strategy that could work really well for you is the BRRRR method (Buy, Rehab, Rent, Refinance, Repeat).