Beale AFB has a long history of providing intelligence resources for the armed forces. L&H Airco rose to the challenge by working with one of the most secure facilities on base. This facility was originally designed using the first generation BACnet global controller from Alerton, the LSI, along with the first generation of user interface, BACtalk for Windows. Throughout the years, the building was updated several times to support the evolving mission of the Air Force. This allowed L&H Airco to continually upgrade the system using Alerton’s most recent control offerings. All generations of Alerton’s BACnet control products were, at some point, installed in the facility and seamlessly worked together. This site is a prime example of the backwards compatible approach Alerton adopted with product evolution and release.