They did an oil tank sweep and there was no tank residue or history, so that was a plus.

At a residential facility I work at clients often try to vape in their rooms.

Still I agree, no reason to cave on this or anything.Vaping leaves the resulting oil behind in which case can develop into what’s called “ popcorn lung”  in a person from it being trapped in their lungs . that residue in the air is sticky and gets all over the place and of coarse the hazards of a potential  fire .

Behind the counter employees are a huge expense (unless you are a multi hundred unit facility) and if your competitors use them and you do not then you can either undercut their prices or reap more profits.

Only thing I would say though is don't focus too early, meaning know whats out there, question a lot of things and  know why you are focusing on say large Multi-family vs oil and minerals.

However, the drillers hit oil nearby. 

Your arrangement is not one I can see working out long term unless you had separate facilities & entrances on the other unit.

I am currently a full-time engineer with an oil and gas company in Corpus Christi, TX.

An investor bought a home in our neighborhood and made it into an assisted living facility much to the chagrin of the neighbors directly surrounding the home.

You are always going to have holding costs (electric, oil/gas, water, etc...).