About 150 firefighters were called to Glassell Park before dawn Monday after an old commercial building caught fire and was engulfed inflames.
The fire broke out in the 3000 block of North Fierro Street at about 5:18 a.m., according to Brian Humphrey of the Los Angeles Fire Department.
Firefighters took a defensive stand in fighting the blaze, according to Humphrey. It was knocked down in 1 hour and 40 minutes, according to LAFD's Erik Scott.
Arson investigators were working to determine the cause, and the amount of the loss had not yet been estimated.
The old brick building was built before the 1933 Long Beach Earthquake, said Capt. Daniel Curry with the Fire Department. Firefighters had difficulty accessing the fire, he said.
Aerial video from Sky5 showed firefighters putting water on the flames from atop ladders surrounding the large structure as a dark column of smoke rose about Northeast Los Angeles.
The fire was fueled by combustible storage and propane cylinders, according to Humphrey.
High winds spread the flames throughout the yard into an adjacent building, Curry said.
"It's been very difficult," Curry said.
Crews began to get an upper hand on the fire and transitioned to an offensive attack as of about 7 a.m., Curry said.
No injuries were reported.
The site of the fire was about a block from the Los Angeles Police Department's new Northeast Station at 3343 N. San Fernando Rd.