The fire broke out in the building on Mitchell Street in Orange around 3:30 a.m.
NewsCopter 7 was over the scene shortly after 6 a.m. as firefighters worked to get control of the smoky blaze.
An exterior wall collapsed during the firefighting efforts, damaging some vehicles along Jefferson Street.
No firefighters were injured.
Mitchell Street was shut down between Tompkins Street and Scotland Road as fire department activity continued.
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