It would be my first investment in real estate outside of a residence and I do not have an LLC set up.Should I set up an LLC or would a sole proprietorship with liability insurance be the best course of action?

And I doubt the Fulton County Tax Commissioner would sell such a lien, though you never know.Again, I can't give you legal advice, but this is how I think about quiet title and prior tax liabilities in my Fulton County investments.  

Note that youir company can't get the loan (section 4.01b 'Partnerships and corporations' says "Loans to general partnerships, corporations, limited partnerships and limited liability companies are not eligible...") but you can generally deed out of the (I assume) LLC and deed in with personal guarantee, possibly with help from your closing attorney.

This is costlier but better liability protection. 

I know they are good at limiting their liability, but it seems this one is obvious and not outside of the expected level of competence.

Even with consensus, more due diligence is often if not always needed.Even the asset/liability question on a house is dependent on the individual.

Do not increase your liability which are things that takes money out of your pocket.Try to be always prepared for the future, whatever could happen. 

You are opening up yourself to a lot of liability for relying straight from a google search.

It will not completely shield an individual from liability.

Yes, good thoughts Chris, profits in private deals, lenders can't take profits in connection with loans, yields are unknown and usury comes into play as well as liability and security issues.