A system for providing physical access to a building that is for sale, lease, or rent is described. The system includes a server, a remote device located at the building that prohibits access to the building, and a handheld device. The handheld device transmits location information for the handheld device and identification information to the server. The server identifies the building based on the location information and transmits marketing information for the building to the handheld device. The device displays the marketing information and transmits a request for access to the building, the request transmitted to the server. The remote device is configured to provide access to the building when the remote device receives an access signal from the server or from the handheld device. The access signal is sent from the server based on confirmation of the location information for the handheld device and confirmation of the identification information.