I would just go so far as to put a system in place to enforce and make sure that all of your tenants have renters insurance. 

I have been looking at the MLS (wife is a Part Time Realtor for now) I is hard to find a descent deal and when there is one you have like 20 investors jumping on it lifting up the price if not the Realtor hold on the offers trying to scam the system.

But long term, you should look into systems that will allow you to live where you want and invest where it makes sense.

I am highly confident you have a radiator system or terrible leak in your water system. 

Come to the end of the project 2 days after carpet was installed in the basement we have a ton of rain and the existing waterproofing system fails and floods the basement.

If the units are twelve years or younger, and the contractor suggests a whole new system, without putting hands on the units, RUN!

@Robert Kirkley  Commercial loan where they have the flexibility to lend on properties that need extensive rehab (no kitchens, heating system, etc). 

From our experience, Rich Durante of D&R Property Management and Joe Mundo of World Property Management are two companies we'd recommend.

I'm all about putting my systems in place before it is occupied.

This can alert you to a heating or cooling systems failure.