A firefighter has been hospitalized as dozens of Los Angeles Fire Department personnel fought a greater alarm fire at a commercial building in Van Nuys Wednesday evening.

The injured firefighter suffered a “non-life threatening medical complaint (no trauma injury),” fire officials said in an alert.

The LAFD later clarified it was “heat exhaustion.” That firefighter’s condition is unknown.

More than 85 other firefighters responded to the fire in the 7000 block of North Van Nuys Boulevard, where the blaze was contained to the building of origin and the LAFD defended more than 30 nearby businesses, the LAFD said.

“The RS3, Robotic Fire Fighting Vehicle was deployed to apply high volumes of water (master streams) more deeply into the building than was safely possible by firefighters,” the LAFD said. “The combination of hand lines, ladder-pipes, RS3 and the team of over 85 firefighters, working under the command of Assistant Chief Corey Rose, fully extinguished the fire in over four hours.”

Before the fire was brought under control after 7 p.m., the LAFD said the neighborhood had been impacted by the blaze.

“There is heavy smoke blanketing the area and neighbors are advised to remain indoors with doors/windows closed,” the LAFD added. “Power was shut off to the block which caused ‘stuck elevators’ in a nearby assisted living facility. A full task force (10 firefighters) is at the facility handling the situation.”

Arson investigators are on scene, though the cause of the fire has not yet been determined.