The fire was reported just after 1 a.m. at a three-story building on Broadway and Voorman near Divisadero.
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Crews arrived to find fire coming from a broken window at a printing shop.
Fire crews were able to put the fire out quickly. There was some smoke damage inside the building.
No one was hurt.
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Investigators believe the cause was arson.
Firefighters say if it wasn't for the early call, they wouldn't have been able to save the building.
Officials have not said if a suspect is in custody for starting this fire.