The fire was reported at around 6:30 p.m. at Public Storage, 88 Blossom Hill Road. As of 7:15 p.m.
ABC7 News reporter Dustin Dorsey tweeted video a viewer sent him of a huge plume of black smoke rising from the fire. The viewer told him they heard what sounded like fireworks that shook their house before they saw the smoke.
Neighbors close to the fire say the explosions shook their homes.
Roads nearby were closed and traffic was delayed as firefighters battled the fire.
The cause is under investigation. No injuries have been reported.