It took about 65 firefighters from Glendale, Burbank and Pasadena fire departments to knock down the fire at about 4:45 a.m., she said.
The fire was contained to only the second floor of the building. The blaze was elevated to a second-alarm fire at 2:06 and elevated to a third-alarm at 2:22 a.m., Villanueva said.
The first floor, where Paradise Bakery operates, sustained water damage. Fire officials requested a building inspection to check the structure, said Glendale Police Sgt. Tom Lorenz.
It's unclear which offices were located on the second floor, he said.
The investigation is ongoing, authorities said.
"We're working with the Paradise Bakery owner currently to determine the impact the fire is going to have on their business. We don't have cause at this time and we don't have content and structure damage yet," Villanueva said.
Written by Glendale News-Press