The previous owners have basically remodeled the home except for a few finishing touches (kitchen remodel and bath tub still need to be put in) and the HVAC system (it has not be put in (they have all of the materials, just haven’t put it in)).

They have great in-person service and a robust online banking system. 

Alternatively, you can sign up for an online rent collection system that can accept ACH or Credit cards.

We have a guy in India who does a fine job and is so inexpensive I would literally be stupid to do it myself.Set these systems in place early.

I thought I had a leak but have had the whole system looked at and nothing was found.

IT is costing me about $24,000 to do this because I have to bring the electrical system in both apartments up to current code, plus buy new HVAC units and all new ductwork separating the units and water heaters. 

A system in place where the broker guides you to pick a strategy or niche?

in addition to waste oil tank, there could potential PCBs from leaky lifts and impacts from motor disposal well or septic system if was used at site.  

I was thinking something along the lines of a Ring system, coded entry knobs, and a few cameras up high on the corners of the building also.  

Here are my few feel free to add more.Flexible (this game is unpredictable so you have to be willing to adjust accordingly).Patience (Especially in the beginning it takes time to get systems in place and people in place).