MOC is located just north of San Francisco International Airport, San Francisco, Calif. The system is based around a three-level network hierarchy. Individual data collection and activation networks serve the access control, energy management, and safety monitoring subsystems. The access control system allows employees entry and exit into the facilities while preventing access by unauthorized people. Entry or exit is accomplished by presenting a valid access card. Card readers are used because of decreased sensitivity to weather conditions and resistance to vandalism. The energy management subsystem is designed to save almost 3 million kilowatt-hours of electricity in the first year with significant room for growth. The return on investment for this portion of the system was in excess of 50 percent. Finally, the safety monitoring subsystem comprises more than 1,000 sensors measuring water flow, products of combustion, valve position, smoke, heat, low air, and ionization. In addition, a system of video-alarm annunciators, strategically placed near building entrances, display information regarding type and location of safety alarms. The project required a prime contractor, 3 subcontractors, and more than 25 equipment manufacturers to address the situation adequately. Charts are included.