I know Virginia Beach is attractive but that average price for Alexandria strikes me as rather low.

The return on equity is probably very low considering they are paid off so maybe explore refinancing or selling the lowest performing one(s) or your biggest headaches to reinvest in more lucrative deals.I noticed you also used a metric of number of rentals to attain your goal rather than $$$/month.

I recommend looking outside your area and review who fits your profile the best.

If low wet ground check with people moving dirt for free fill dirt.

@Aaron Zimmerman HubSpot is a great CRM to use at a low cost.

The real estate prices are relatively low, compared to the cities & more touristy areas, but the rental returns are good, with a low vacancy rate.

On the flip side the clients I fund in my land deals are doing very very well in the foothill subdivision 50 miles or so west of the springs.. but thats the land game buy low sell high.. cant wholesale that stuff it needs to go on MLS to marketed and turn around time is generally 90 to 180 days but nice margins for my clients ..

There are a few others here on bigger pockets who have endeavored to do so and can attest to this  (but I will not name them).Basically AHP bought 1000s of low value non-performing loans, these require the most oversight mainly due to the condition of the properties. 

Note: I'll caveat: I believe that other factors should be considered when analyzing the market as well (i.e. economic growth/stability, low crime rate, affordability, etc.)

218K seems a little low for the area.