If you don't have your own track record, you need to partner up with someone who does.As for the actual books, you can start with https://www.biggerpockets.com/store/raising-privat...by @Matt Faircloth.

So the seller came to me with a deal he was inherited by his father which is a nice piece of land and its leased out by a big grocery store chain and pays so much a month and is worth a good bit.

We're talking folks from Korea, who sometimes started out in grocery stores and retail, had stores burned in the '92 riots, went through lots of hardship.

The Sacramento Association of Realtors, which has training and a store with all the supplies you need, is off Howe. 

I was thinking of buying one but i do not see them in the book store anymore. 

@Tee Allen

You just lost weeks of rent income storing $150 worth of crap.If these were items of real value that you expect the tenant may come back to claim, then you can consider placing it in storage (even your personal garage).

That's not to be evasive, but as @George Fitz said above, Self Storage runs the gamut of options with the common denominator being you (the owner) rented space for people to store their treasures (and even this can be household items, boats, RV's, commercial, etc.)The three questions that we typically ask others (and ourselves to) when they're contemplating buying a Facility is the following:1) Why are you excited about this deal? 

As it stands right now I own a 4 unit commercial building (2 store fronts, 2 apartments).

This will give me plenty of time to store some cash and continue to educate.