IMO, using a generic packet will not get you the accuracy and precision you're going to need for 400 doors

If you want accuracy, take the route I gave you above. 

In the end, if AI and AML can remove 'all doubt' from an investor to engage on a property, because it has performed all the analysis to some 'certain' level of accuracy...and that accuracy has a proven track record, then I think that is where the target should be. 

The county doesn't really care about accuracy - all they can about is if taxes are paid.

Maybe im wrong, but doesn't the accuracy of that # matter for my calculation results?

Of course the REALTOR cannot and does not guarantee the accuracy of information provided by third parties. 

         Some of you are incredibly lucky to live in a city that provides a macro-market for investing. What this means is that most of the homes in a particular city, with few exceptions, have similar styles of const...

The seller is guaranteed over compensates the buyer by about 1% for this  (182.5/180.0).Before I get too far,I am trying to claim my property tax deduction (as a buyer) and I would subtract what the title company says the seller has credited me, but I question the accuracy of using 180 days.As a seller, I also would claim that number for prorated property tax I credited the buyer by what the title company says in the final HUD..

@Brian Garrett thank you, man id love to be down by you, but I hear flippers are only getting 8-10% return on flips, can you chime in on the accuracy of that ?

Also, if you are looking for one place where you can learn a ton of stuff about a city, it's demographics, industries, education and what not, check out https://datausa.io/profile/ I can't vouch for the accuracy of it's data, but, it looks reasonable and they have a lot of cool information.