The fire broke out around 10:30 p.m. in the ballroom's mezzanine level.
Six firefighters suffered minor injuries.
It took over an hour to get the blaze under control.
There's still no word as to how the fire started.
The concert hall's website showed no events listed for Tuesday night.
The venue on West 52nd Street and Eighth Avenue has hosted a variety of events, from Hillary Clinton's birthday party to concerts and movie premiers.