A computer system and method carried out by the system for assisting parties in negotiation the sale price of real estate or personal property is disclosed wherein a web server receives a property listing from a seller at an asking price, receives a bid from a buyer at an offer price, compares the asking price to the offer price and determines whether the difference between the offer price and asking price is within a first, second, or third predetermined % value and notifies the parties whether they are cold, warm, hot, or matched. If there is a match, an agreement of sale may be generated.