Talk with a local realtor and tax accountant.  

The back taxes are 2k as the first lien.

@Alexander F PollockYou may lose a tax benefit of a stepped up basis for capital gains purposes transerring interest away from her parents.Also consider conducting a judgment searches on all parties to the transaction to confirm there will be no title problems for would come up when the LLC sells in the future because you will not have title insurance to cover prior owner issues.

One lender hit one of my clients that I was doing a JV with... for 800 dollar property tax monitoring fee.. really on a 12 month loan.. but what happens is borrowers just focus on the points with no clue to the junk fee's  or using brokers who add fee's and points on top of the actual lenders fee's again bait and switch.

Then you just make money, build wealth and pay less taxes. you just need to do the HomeworkLuis Maqueira 

And as states like California and New York lose the highly taxed millionaires and they move to lower or no income tax states, expect them to raise taxes on the lesser taxed to make up for the huge portion the rich paid.

Make use of tools like PropStream or Zillow’s market analysis feature to assess property values and rental potential.PS: Did you know that Indiana has one of the lowest property tax rates in the country, making it a relatively cash-flow-friendly market for new investors?

Here is a framework to think about how buying properties creates the most tax efficiency for you.The 6 levers of depreciation:Lever 1 - % of LandOne of the components of a property is land.Land is NOT DEDUCTIBLE, so low value land properties mean more tax deduction.A value of your overall purchase will be assigned to the land or lot.You receive no near-term tax benefits for buying land.For example - If you buy a $2 MM industrial building outside a rural town on 5 acres, the land value could be $5k an acre.

I would tell the seller to figure out themselves and NOT provide them any tax advice. 

I'm looking into tax sale overages and found a few courses by Bob Diamond, Nick Fullmer, and Shawn Buige.