Still, if you’ve got someone on the ground who truly knows how to navigate these waters, it’s like being handed a map with all the back roads highlighted.

Its extremely important when running tighter margins like what you're talking about to focus on age of HVAC, water heater, appliances, roof, etc.

In addition, I will also be paying much closer attention to water flow patterns and signs of erosion around our next investment!  

Over a weekend during which my tenant was not home, the condo became flooded and water went through the flooring and flooded the office below.  

Given this is where my major operating expenses fell (beyond taxes and insurance), keeping this cost lower, by average, helps my cash flow.I invest in older neighborhoods, so the 2-4 unit properties, typically have single water meter, maybe single electric, and many have radiator heat with a single boiler.  

The rental might be vacant for a month,(8% loss) or a tenant might not pay for a month while you pay to evict them.(8-16% loss)  A $1,000 appliance/water heater, or a $8k rook or hvac unit might go out.(5-40% loss)  You should be paying a PM 8%.

An alternative to batteries is a "water battery". 

That certificate would show open taxes, water, housing violations, citations, condemnations, receiverships, construction liens and other municipal liens.

You might need a 2nd well if you're not on city water. 

I estimate high of what the bill would be and put it on their lease, I have not had any issues this way and if the water bill goes up, I will increase on the next lease.