Any advice re: county tax deed sales

[Timothy Hood]

County owns a run down, late nineties built, property and has listed it on the County Clerk website under "Notice of County Real Estate (Tax Deed) Sale".  The minimum bid is $27K and before it was abandoned, about 7 years ago, it was appraised at $185K.  This property is in really bad condition and needs extensive exterior and, presumably (boarded up - can't see inside), interior work to bring it up to move in condition.  I think this could be a good rental home if could be renovated for $50K or less and have good equity.

The County Clerk's website says the winning bidder is not responsible for back taxes and then immediately says, "Current property taxes and special assessments, charges, and taxes may be the responsibility of the successful bidder".  What are "special assessments, charges, and taxes"?  What taxes are there other than the property taxes?

Any advice or warnings from others in Wisconsin, or elsewhere, would be helpful.

Thanks in advance, Tim.