A system and method for controlling access to a property using an electronic device on said property to collect biometric data or other identification from a person seeking access to said property. The device located on the property can communicate with a remote computer that decides whether to allow or deny access. Persons seeking access can be categorized, and different access procedures can be used based on the person' s category. The system can track and record all accesses, egresses, offers and counter-offers made on the property and many other types of data about the property and sale of the property.