BPO's are usually done for the lending institution who either owns or services the current note for a particular property.
Appraisals are usually done by lenders either writing or re-writing a note/loan for a particular property.
I do not think your presence would be beneficial, in any case.
This is not something that is typical and honestly it does not matter. Your agent should be showing you comparable homes so that you know what the home is worth. It does not matter what an appraiser things. I had a short sale in Cedar Park where the BPO came in at $10k higher than the list price I set. When the bank asked me to increase the list price and the home sat on the market for 90 days with no offers I reduced the price again and we had an offer immediately that closed in less than 45 days.
As I have mentioned in the other questions you have asked... each short sale stands on it's own and will have different outcomes. What you need to know is that your agent is experienced in selling shorts sales, market knowledge and negotiations so you can thoroughly understand the market and get the best deal possible.
Best of luck to you.
REALTORÂ® | Mortgage Broker
Keller Williams Realty | 360 Lending Group
It is a longer process to close on a short sale, be patient and trust your Realtor!