ANAHEIM, CA – At 11:35 pm Tuesday night, Anaheim Fire & Rescue responded to a residential structure fire in the 1700 block of N. Community Drive in Anaheim. The location is a large multi-building, multi-unit senior living apartment complex. Upon arrival, a working structure fire was located in an upstairs unit. The fire communicated from the apartment into a common hallway. As a result, several residents were trapped in their apartments. With the assistance of officers from the Anaheim Police Department, the trapped residents were rescued from 2nd story balconies.Due to the number of potential patients, 2nd and 3rd alarms were sounded. Approximately 60 firefighters from Anaheim Fire & Rescue, Orange County Fire Authority, Fullerton Fire Department, Brea Fire Department and Orange City Fire responded. Fire personnel initiated an aggressive fire attack and achieved knockdown on the fire within 20 minutes. Fire personnel were successful in preventing the fire from extending into other apartment units and structures.Three patients were transported to local hospitals with non-life threatening injuries. One upstairs apartment had significant fire damage, seven had significant heat and smoke damage, and an additional eight downstairs apartments remain without power. The American Red Cross responded to assist approximately six residents who were displaced and did not have family in the local area.Fire Investigators from Anaheim Fire & Rescue are on scene investigating the cause of the fire and have determined the fire initiated as a grease fire in the kitchen. Damage is estimated to be approximately $400,000 in structural damage and $50,000 in content damage.