Unfortunately by statute unpaid property taxes are senior to all purchasers of real property. From what you have written, the real property that you purchased at auction was a sheriff's sale to pay an unpaid judgment that was recorded on the property.The mortgage was senior to the abstract of judgment that was extinguished by your purchase. Unfortunately you took title to the property subject to the unpaid taxes and mortage. In order for you to not lose the property via a foreclosure by the lender or a tax sale, you need to pay off the property taxes and keep the mortgage current.Unfortunately for you, you took a $13,900 risk and there is no way for you to get the money back unless you can sell the property on the open market subject to the existing liens that are not paid off.