Understand that this is large volume, so if you look at just one months mailing it may not fall in those stats, even though your 1/500 falls exactly at 0.2%.  

i.e. metro area, unemployment, job diversity, housing stats, flood plain, is the immediate location in decline/stagnant/on the rise, etc.Next, since you have all POHs here, you need to get some comps on what the market lot rent is.  

All signs point to a red hot market in St Peterburg, Clearwater, and elsewhere in Pinellas County Florida and the Tampa Bay region for 2016 in this Jan 2016 Market Status from Pinellas Realtor Organization.Some highlights:The new year started strong for Pinellas County real estate, with January 2016 stats showing more new listings, fewer days on market, and Median Sale Prices way up from January 2015. 

Crime stats can assist, but it is easy to see the direction a neighborhood is going from a quick drive through.  

You can acually break dow  that info by neighbourhood with realtor stats combined with your government stats.

Speaking of which, anyone having any luck using Zillow's pre-forclosure stats?

Nextdoor.comMake sure you are signed up on Nextdoor for your local neighborhood and post recent sales, market trends and stats regularly.

I plan mailing a yellow letter and have been examining my list by calling owners and asking if they are interested in selling.

Roll up your sleeves make calls, read statistics, talk to the locals, get crime stats, and learn the market.3.

Look at the bigger picture before the details, and examine possibilities / potential upsides, then the fast due diligence (what could go wrong, what am I missing that can bite me later).I'm familiar with the neighborhood.