Just as Steve said. The equator system pulls information from outside sources like county records and third party valuation sources. They have an internal evaluation group as well.
You can get around this system but it is only one of many road blocks you will run into. Unless this property is really worthwhile, I suggest you read the writing on the wall and walk away. There has been much discussion about how difficult it is to work with BOA.
I just completed a BOA deal I started in July and we had to eventually go A to C. It took the better part of 8 months to complete a deal. I had to go to the Senior VP in their Mortgage loan division to get it completed.
I have a few others that I am still working on which I started several months ago and I wish I had never taken them on. Think twice my friend.