Outgoing cast iron pipe is more of a concern than newer white PVC pipe.

From your post, it sounds as if you've exhausted your cash putting 25% on ready-made single-family rental properties.My suggestion to you would be to study the BRRRR method and link up with investors and wholesalers in your area.

Roof/HVAC/pipes are new?

Pex Piping , Slab foundation, no slider or door for rear access from inside the house (have to add a side gate entrance to the rear) No garage, No Dining room (possibly could put a small table but the island would be a better idea)What's wrong with Pex?

(Broken windows, heater broken, leaking water pipes, electrical problems, holes in walls, rotting porch, among other damages.)The buyer continues to make payments, but if they stop then you have a ton of repairs before you can rent out the house.

Find out if there are any new regulations in the pipe from each of those inspectors and municipal officials - anything that might cause you problems after you take over.

It busted pipes and for a couple days, water ran before someone got it turned off. 

For instance, a claim filed under a federally declared natural disaster is most likely looked at very differently than a claim for a leaky pipe. 

We have exhausted the use of an agricultural exemption under MCA.

If I get exhausted from that, I'll pivot.