I may have run across an owner of a self storage facility that may want to sell. 

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.

Is there any further opportunities for income, e.g. laundry or additional storage?

Tenant uses the garage for only storage. 

I just purchased a copy of their book on analyzing and valuation of self storage facilities.

My end goal is to get buy and holds/self storage.

Alternately you could be stuck for hotel and storage/moving fees.

He said that recently (last 10 years) he has been investing in self storage and he loves it.His advice to me was to invest in boat and RV storage as there is only 1 other, small provider in town, and he is regularly receiving calls from people looking for a place to store larger items, like boats, RVs, semi trucks, tractors, etc.

I keep leaning towards commercial properties, either storage units or retail strip, office space or even an Airbnb.

@Prudence Meads the large hedge fund companies have been buying investment real estate for decades, not just residential properties, but commercial as well including multi-family, self storage, office, etc.