Welcome to landlording ..........this is the stuff that will have you thinking about retiring early if you do this long ehough...........I've been doing this for longer than I can remember and while I think I have seen it all and are pretty good at sizing up deadbeats.......they still slip through even to this day........     

Size, age, condition and amenities play into this too.

Dry cleaners, auto repair shops etc.Be sure to do your due diligence on the tenants thought for anything this size.

@Rob Harris what size/amount property?

I was told that it's a small fee for loan processing depending on the size of the loan.

As long as it is a solid surface you would be able to park a vehicle or camper, trailer,  on the slab if you wanted to.That size slab wasn't cheep to put in, ugly it still has value.I'd just plain not think about it and leave it as is until you decide to change it over into a car port, shed, or put a fence around it.  

The thing that makes this an attractive option is the lot size.

So my question is when do you or have you made an offer on your commercial sized buildings?  

I looked into this and FHA will allow this, also the new granny flat laws just went into affect for california allowing "accessory dwelling units" on SFR lots sized up to 50% the square footage of the primary residence.  

I have a medium sized amount of money in a Self Directed IRA.