I'm not in NE, but I got a house about 7 years ago on back taxes. Yes, it's an older house, in an older neighborhood (most of this town is very old so not a big deal here). Took at least a year, had to have an attorney do the quiet title stuff, but it worked. I looked at the rather large list of properties up for at least 3 years unpaid back taxes, then researched who owned the houses and picked what I thought was the house/owners who would not pay those back taxes (and interest) back to me. I should have done this for a couple more houses that the same people owned - they were very late on all their taxes (at least 3 years) on all 3 houses and they lost them all. I just figured paying more than one house' back taxes owned by the same people may have not looked good, so didn't do it. It cost me about 5 grand total to do this.
Anyway, the house is now worth 2.5 to 3 times what it was 7 years ago, and I am going to be sticking about 20 grand and my sweat equity in to it this summer and then flip it. That extra 20 grand or so of materials on the refurb work I do will add about another 80 grand worth of value, and that will get it to about 300K level, which houses at that price range fly off the shelf.