It depends on a few things. How much the owner owes and the bpo of the home.
Lenders will send out agents to do a brokers price opinion. That is where they will know how much to make the starting bid. From there the trustee will have a starting bid, if know one bids the home goes back to the lender. Some times the lender calls the owner and says hey, do you mind making payments agian??? we couldnt sell your home :(.
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Sorry to say there is no hard and fast rule to your question. It would be nice to say x% but that does not reflect the real world. Some depends on the trustee and other times it depends on the trustor. For example, if a bank has a large interest in the property, they might buy it back in foreclosure. If it is a trustee sale to pay back taxes, it depends on who is bidding. A homeowner that has been negligent on their taxes might not want to lose their home.
It seems to me that you are looking at a home that is listed as a trustee sale and want to know if it is a good deal. That all depends on the comps for the area. You probably already have an idea of the properties worth, but a good real estate professional can help you get a little closer of an idea of the true market value of a property.
Please let me know if you need any assistance. I can run a CMA with no obligation.