A real estate computer network10facilitates a real estate transaction between a buyer13and a seller12by electronically communicating between the parties12, 13and third parties such as a real estate facilitating entities24(e.g., lawyer, mortgage provider, title provider) over a network14, such as or including the Internet16. Each stage of the transaction is supported by the parties utilizing an online real time interactive communication interface120to list property information; to search for a property in a property database20; to negotiate via an electronic purchase contract96; and to schedule associated events (e.g., showings) and deadlines (e.g., closing, mortgage filing). Other real estate services are supported, such as electronic mortgage calculator224, electronic mortgage application226, searching for comparable sales92, electronic document delivery222, and others.