There will always be some sort of next of kin out there somewhere in the line of succession. The liens will grow until title is transferred out of the deceased persons name and either paid off or property sold. If taxes go unpaid for five years the property will be auctioned off. I have paid a private investigator to find the first heir to properties before and had some great deals out of it. You will have to go through probate with an attorney to transfer title, unless property is in a trust, or if property is appraised under 150K, at the date of death, you can do a terms of succession, which is usually a few months instead of a whole probate process and if there are multiple heirs it gets tricky. Let alone you will have competition during the probate/succession process and contracts are not fully binding since property will not be in your sellers name yet. You can always start paying taxes and take care of property and try quiet title or adverse possession, but that’s a risky game to play. FIND THE HEIR AND CUT A DEAL THAT WAY! My best advice on this