Buying Property with Liens

[Ben Leavitt]

I am still a newbie currently in the middle of a live in flip. I recently took the family "walking for dollars" in the neighborhood and came across a FSBO single family being sold as-is and called the number on the sign. The property has some back taxes and liens and needs a lot of work but comes at a significant discount, falls within the 70% rule.

Since I have never dealt with liens before my question is, what's the best way to lock the property up but still give myself an out in case liens aren't "as advertised" or construction is more than anticipated?