The fire in the 1300 block of West Valencia Drive was reported at 2:45 p.m., according to Fullerton police.
Fullerton Fire Department with assistance from surrounding fire departments knocked down the blaze shortly before 5 p.m., according to the Orange County Register.
Valencia Drive between Euclid Street and Basque Avenue were closed by officials.
A Fullerton firefighter suffered a heat-related injury and was hospitalized for treatment, according to the newspaper.
The total damage was still being determined. The cause of the fire remained under investigation.
Copyright 2022, City News Service, Inc.