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On August 22, 2013 I noticed Elevator , 1,2,3,4,5,6,7,8 cameras system was down as well as the elevator IMS system Groups. I called security rover to verify if all the lights in inside each elevator were on. I checked the fire panel and it read. (POWER LOSS RTU4 AND RTU6 ROOF LEVEL). I informed rover to check the electrical breakers that supply electric to the front desk located on the 3rd floor north electrical room by elevator #5. All elevators are working properly. We were just having a small power failure. I also informed security rover to check the electrical room on the roof top but he was unsuccessful of taking care of the situation.