I'm a Realtor and also investor/flipper/landlord and I feel confident I could made a qualified purchasing decision on a property if I had someone via smartphone allow me to walk through, see details, drive through the neighborhood and provide me with any additional data needed.

I find that redfin.com has some good data buried within their sales algorithm.

Hey All,Curious if anyone knows of any type of software where I can pull the historical real estate data for specific geographic areas? 

They have asked me why I need the data.

Go to census data american fact finder ...

It seems like a long time to me, but I'd ask your Realtor for some market data.

Disclaimer: I haven't worked with many of these data sources for over 5 years now but many of them had similar data sets and several had APIs that were reasonable.

Best place to find deals is by gathering data/lists of homeowners who likely have some sort of motivation that will get them to need to sell their property for a discount and quickly. 

Dallas has been growing well with new headquarters, divisions, and data centers are being built while older corporations are re-leasing or developing on new grounds. 

Most major cities have open data portals accessible for free online.