Reminder that some geographic diversification in my portfolio would be a good thing. 

I was loose with my description.

Some people don't check the legal descriptions, when they buy commercial properties. 

That's a well-designed portfolio from a geographical diversification standpoint. 

Some counties have some sort of GIS (geographical information system) interface for their data.

This setup may work for investors who want to remain somewhat involved, but it can fall short for out-of-state owners looking for passive income​From your description, it seems you have a system in place for these foundational services.

Analyze a bigger geographic area over a broader time period.

Challenges have been mentioned above in the description Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

You also need to be in contact with a Realtor who can dig deep into the areas and numbers for you.For example, Buckeye is a very large geographic city.

If you see a listing that might have some selling clues in the description (i.e. needs work, owner moving, divorce, etc) or one thats had a recent price drop or a deal thats fallen through, don't be afraid to put in an offer of say 150k on a 200k house.