A structure fire in Woodland Hills threatened a commercial building Sunday night, the Los Angeles Fire Department said.

The fire was first reported shortly after 9 p.m. in the 6000 block of North De Soto Avenue, the LAFD said in an alert.

The 100-foot-by-200-foot vacant building was showing fire through the roof a few minutes after the LAFD’s first announcement, and an update at 9:37 p.m. said “the structural integrity of the building is starting to fail along at least one corner.”

More than 80 firefighters were working to extinguish the blaze.