,RealtyTrac data is typically very stale, or was last time I used them a while back.

According to 2013 IRS data, 77% of all households fell into this broad category. 

Think of all the places in a home that an industrious profit-driven drug creator could squirrel things away.

Not sure exactly what you are looking for data wise.

Hey Simon,I'm building a tool that does pretty much what you describe, to automate what I'm doing in spredsheets.http://www.reikit.com/compsIt uses zillow/google maps data for lookups, but I use it with my own comps that I got from my realtor, then I run my own adjustments to get an accurate ARV.It's still early days, but check it out and let me know what you think.  

After the call if it seems like a potential deal, then at this time is when I would begin analyzing all the data to see if the #'s work.

Do you think appraisers typically make reports strictly from data or do you think personal bias play a factor.

Take a look at the US cencus data on certain zip coes within a city.  

If you would like to be added to my investor data base I would like to hear from you.  

These are leads you pay for so you add them to your data base and just keep notes on them.