A fire broke out on Friday on the seventh floor of the "Maison de la radio" ("Radio house"), a vast circular building in Paris housing several media operations.
Firefighters said the blaze started on the seventh floor which is currently under reconstruction and employees were quickly evacuated from the building.
Two radio stations, France Info and France Inter, stopped transmission due to the blaze.
There were no immediate reports of injuries, according to a police source.
Thick black smoke was seen billowing from the building, an iconic structure in the plush 16th district of Paris that has been undergoing significant renovation.
Fire service chief Gabriel Plus told AFP that 16 fire engines had been dispatched and that they were setting up a command post on site.