Tones dropped around 0900 hours for a structure fire in the 200 block of Mattis Avenue. Incoming units were advised of a working fire and PD had removed one occupant. Engine 88 (Middletown) arrived on location with a well involved, 2.5 story, frame duplex. A second alarm was requested by Command 88 as fire was rapidly spreading throughout the involved duplex and threatening a similar type exposure to the west. Companies briefly went defensive to knock down the bulk of fire before declaring control.