I have been seeing this grading system of Rentals being used.

There's no way to get in contact with support aside from the ticketing system.

What your are asking about should be an automated system in their company.

If I build two 4-plexs (townhouse style) per 21,400 SF, I don't need to have a sprinkler system.

Agree with above, but start building your processes and systems and you'll be fine.

Regarding the private sewage, my understanding is it is a septic system with a drain field that is located across from the park.

There was 2004 remodel that updated mechanical, electrical and sprinkler systems.

All systems are a go... except financing.

I've put almost $25,000 into the house with a major repair for the well water system. 

Hey BP,I’m managing 4 units for a distance and am trying figure out the best system or solution to the keys.My first thought is to have a boots on the ground person I can trust to collect keys and take pics of units when tenant leaves.