An electronic lock system that uses an intermediary controller (“IMC”), such as an electronic lockbox, to communicate with an electronic lock that protects buildings, such as dwellings. The IMC also communicates with a wireless portable computer (“WPC”), such as a smart phone, so that an authorized user can first authenticate credentials to the IMC, then have the IMC (or the WPC) send appropriate messages to the electronic lock to command that lock to unlock. The IMC must initially be setup by an ADMIN, so that the IMC's memory contains the specific codes and protocols to successfully communicate with the electronic lock. In this manner, the user can obtain access to the building without specific knowledge of those specific codes and protocols required by the electronic lock. An alarm panel on a building could also be disarmed by the IMC, if its specific codes and protocols are first setup into the IMC's memory.