Newstalk ZB reporter Ethan Manera was at the scene and said at least seven fire appliances were responding.
Shortly before 6.30pm, Fire and Emergency said five crews were still on site working to fully extinguish the fire.
“People are advised to avoid the area to allow Fire and Emergency crews to work,” they said in a statement.
“There is some smoke in the area, so if you are affected, keep your doors and windows shut and turn off your air conditioning.”
No one was in the building and Wellington Free Ambulance told the Herald no patients have been transported for further treatment.
An investigation into the cause of the fire will be carried out.
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