Earn I recommend using a combination of all three methods.

Now 2 months in and I have one tenant in jail ( it looks he didnt have US residency) and the other one calling ( screaming is the right expression) every 3/5 days complaining about washer ( we replaced it), no insulation (we fixed it), clogged toilette ( it was fixed inmediately) and saying the problem with the toilette was never fixed and it looks like the septic tank may be the problem.

@Jim Cummings is right, you could sell as a whole with a 1031 and even combine that with your other property to buy something that sheds more cash flow. 

We have a combination of camera motion sensors, road sensors and linear motion sensors (cover up to a 300-foot span). 

Do you think it would make sense to structure a business this way if a married couple who brings in approx. 160K combined from their primary jobs is starting out with one rental which would bring in approx 12K-24K income annually?

I knew it was here, but the site is huge.

If you can underwrite a loan at a combined loan to value of 90%, you'll be making more loans than staying at 70 or 65% and the difference in risk may not be all that far apart. :)    

Combine this with an awful infrastructure and you get a market that is mispriced and full of opportunities.

I found two inspection forms that I combined to  suit my property (MF-15 units), and just used it for the first time yesterday. 

The cheaper you get, the fewer apartments you'll be able to paint between replacing washers and seals.