The fire was reported at 2:24 p.m. at a two-story building in the 2500 block of Shattuck Avenue, Berkeley acting Deputy Fire Chief Avery Webb said.
The fire was declared under control at 2:54 p.m., Webb said.
The blaze appears to have started in a lower level of the building, which has residential units over a commercial space, Webb said.
Eight residents and one pet were displaced in the fire, Berkeley Fire Chief Gil Dong said.
No injuries were reported, Dong said.