Rental property management technology, in which reservation data is accessed on a rental property management server, and a request from a mobile device for an upcoming reservation at a property is detected. In response to detecting the request, the rental property management server confirms the upcoming reservation based on the accessed reservation data. In response to confirming the upcoming reservation, the reservation management server generates a unique access code. The rental property management server transmits the unique access code to the mobile device and to a monitoring system on the property. The rental property management server also transmits data to the monitoring system indicating that the unique access code grants access to the property.