The fire was reported at about 1:25 p.m. near the intersection of North Delaware Street and East Santa Inez Avenue, Belville said.
Firefighters arrived at the scene within minutes and controlled the fire by about 2:05 p.m., he said.
No one was injured in the fire, which damaged at least five units in two buildings attached to each other, Belville said.
A total of 13 people -- eight adults and five children -- were displaced by the blaze, he said.
The weather conditions today and earlier this week fanned the flames and made it more difficult for firefighters to extinguish the blaze, Belville said.
"Winds were blowing, so they were a factor, and everything was preheated from the heat the past few days," he said.
Firefighters remained at the scene as of 3:45 p.m. and will remain there into the night to make sure the fire does not rekindle, Belville said.
The cause of the blaze is under investigation.