The two-alarm fire broke out on the ground floor and extended to the roof of Davia Restaurant shortly before 5 a.m.
It was declared under control about 90 minutes later.
A cause wasn't immediately determined and no injuries were reported.
Mutual aid responders included firefighters from Glen Rock and Saddle Brook.
Chef Paul Villani reopened the outdoor dining area in mid-June after coronavirus restrictions were eased. Davia had remained closed for indoor dining.
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ALSO SEE: Cresskill firefighters contained a smoky overnight blaze Tuesday to the kitchen of a local cafe.
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