Bank Owned Property/Bank Bought Back Has Real Estate Selling

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I am looking at a property on Monday

Market Value for a single family is in the $300's
Sale Price is $30,000
I already researched the records and found out that there is $10,000 owed on the property in backtaxes. I have to find out if the owner filed a ch 7 or ch 13 bankruptcy and I also have go to the countys office and look up to see if there are any existing liens against this property. Is there anything I am missing here as far as an unforseen added expenses that I need to be aware of? I live in NH. Any advise would be appreciated.
I think that the house has been trashed by the previous owners of the property. Maybe too good to be true...but going to check it out anyway.