What information do I need to obtain to determine if a deal is a good one? I know that I need to establish a FMV. And I need ARV but how do I assess the repairs to get this number? I have read that one should offer 40-50% of ARV but I don't now how to get the ARV. Also, how accurate is a county tax assessment because they seem really low. Should this be the FMV? Please help!