Usually a bank will not order a BPO (broker price opinion) until they are presented with an offer to purchace from a buyer. Also known as a CMA (comparative market analysis), the bank is looking for an analysis that shows the bank the current market value of the property, with recent sold data included. From the BPO, the bank will look at your offer, then consult the investors that back the loan of the sellers, and then the decision will be made whether or not to accept your offer. You never know how many people have to be consulted, so the process could take a couple of weeks to months. A BPO could be done in as little as a day. The bank could come back asking for a higher price, or they could accept your offer out right. Really, the only thing you can do now is sit and wait for their decision. Good luck and I hope you get the home!