Our storage units were broken into down below in the basement by these neighbors, nothing was done.

If you were in my shoes what would you be doing?

Storage of Value

Your post, @Steven Westlake, reminds me of others here asking about car washes and self-storage facilities. 

Self storage is a business, not just real estate. 

So when you think of the income and basically less than 20k a year in Overhead thats a pretty nice business.. unless you count cloths and shoes as necessary items then things get a little wild !!!

I was in your shoes a few years ago when I bought my duplex in south Florida with the VA loan. 

I keep a portable AC (or 2) in storage at my places and whip them out during emergencies for guests. 

In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

Digitize physical receipts for easy storage.