Leaky roof + rain + FL heat = mold. 

It is 2 pole barn style buildings, each 30x40, one with concrete and heat, and the other with a rock floor (Cold Storage).

He at times does small items for free due to I give him repeat business with my property rehab jobs. 

The windows are still in pretty good shape, but sadly they are single pane, and this Texas heat can be pretty strong at times.

Plan for system breakdowns and ask questions like how old is the heating system, water system, etc...

Unexpected repair gets done right and an extended vacancy isn't that stressful.i guess my answer is I have no number, or if I do it's fluid based on my lifestyle.

., no heat in the middle of winter).If this was an eviction for non-payment, why didn't the judge demand that tenant bring the overdue rents to court, to be held in escrow until the alleged problems were fixed?

Most tenants aren't going to tolerate it taking 2-3 weeks to fix their stove/heating/whatever and nor should they.

All the units have the baseboard heating radiators. 

If you separate out the utilities that can be quite expensive because now you need 4x heating systems, 4x plumbing risers & meters, 4x electric systems etc and permits for all of that.