The fire started just before 3:45 a.m. in the first floor restaurant of a three-story mixed-use building on Grand Street in the Williamsburg section.
From there, the flames quickly spread up to the exterior of the second and third floors and into the building's cockloft, according to the FDNY.
Firefighters battled the flames for nearly two hours before bringing it under control.
Six firefighters were treated for minor injuries, and while four apartments were evacuated, no residents were hurt.
The area around Grand Street and Union Avenue was closed as the firefighters continued to work and the buildings department evaluated the structural integrity of the building.
The exact cause of the fire is under investigation.
EXCLUSIVE | Bronx apartment residents say they are being terrorized, beaten by teens who come to building
Apartment residents say they are being terrorized, beaten by teens
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