The fire broke out in the 30th Street business just after 2:30 a.m. Tuesday.
Firefighters were met with heavy flames shooting out of all sides and through the roof of the one-story structure.
"Advanced fire on arrival," firefighters said, forcing them to battle the blaze from outside the building.
A fourth alarm was called for relief purposes, and firefighting operations were expected to continue into the morning.
Two firefighters were treated for minor injuries. One was treated for a shoulder and neck injury, the other for a knee injury.
No one was inside the building at the time of the fire.
30th Street was closed between 47th and Hunter's Point avenues, and Hunter's Point Ave. was closed at 30th Street, as the fire department activity continued.
The cause of the fire is under investigation.
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