What is the average discount on foreclosure after 1 year vacancy

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Anyone know what the usual discount is on a foreclosure that's been vacant for a year?  I'm looking at one in Bakersfield right now, weeds 6ft tall, but the house (on the outside) is in decent shape.  If this inside needs paint/floors/cleanup it could be a good deal.  Zillow estimates the place is worth $117k, but that's subjective.  I'm thinking of calling up the holding company and, after inspection, offering $50-60k.  Thoughts anyone?  I'd appreciate your perspectives.