Someone noticed smoke as they walked by the building Friday night and firefighters found out the place was filled with party supplies and paper products.
The firefight took a dangerous turn when part of the roof started to come down, so all the firefighters pulled out.
"This could have been a catastrophic fire," Batt. Chief Tony Escobedo said. "Fortunately, we were able to get here quickly, even though this was the third fire in a row within a half hour for Fresno city resources to respond to this evening."
One firefighter suffered minor injuries from a piece of debris that fell on his face, but he's expected to recover.