County Owned Property- How/why?

[Jacob D Adamczak]

I was driving for dollars and saw a house that had the windows boarded up in a neighborhood and thought that would be a great property to add to my list.  However, when I checked the tax records to find the owner, it said the county owned it and purchase price was over 2 million dollars.  The value is only about 150k and the county doesn't own any of the surrounding property or land which leads me to believe its not eminent domain.  Its in a subdivision so it wouldn't be something they would purchase to construct a county building etc.  My question is, why/how does the county own this? Any way for me to try to purchase it? Very confused as to whats going on.