The fire was reported about 7:30 a.m. at Designers Body Shop, 13255 Valley Blvd. in the unincorporated area just west of La Puente, Los Angeles County sheriff’s Sgt. David Cortinas said.
It caused an estimated $850,000 worth of damage to the building, equipment and six cars that were being stored inside, Cortinas said.
After extinguishing the flames, investigators examining the scene came to suspect the fire was an act of arson, according to the sergeant.
No one was inside the building at the time of the fire, he said.
The investigation is being led by detectives from the sheriff’s Arson and Explosives Detail. Handling investigators could not immediately be reached for comment.
Anyone with information about the fire can reach the sheriff’s Industry Station at 626-330-3322. Tips may also be submitted anonymously to LA Regional Crime Stoppers at 800-222-8477.