There is not enough detail in your question.
I know this guy can be helpful: email@example.com
Bob Tranchell Total Mortgage Services LLC (508) 367-5731 cell
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Typically, once the BPO price is in the bank will not move off of that price for at least 60-90 days.
If you're looking to buy a home that is a short sale, really nothing different happens on your end of the deal as a buyer. The big thing is the time involved to get final approvals from the seller's bank(s). My team and I specialize in short sale transactions in Springfield and surrounding areas.
Are you working with an agent? A knowledgeable agent should be able to answer basic questions about the short sale process.