There was nobody inside the building and no reports of injuries, he said.
A fire on View Rd in Rotorua. Photo / SuppliedThe fire was not currently at risk of spreading to other buildings.
A bystander has described the fire as "in full swing".
"I just heard some loud pops... then went outside and saw the fire was in full swing," he said.
Fire crews at a blaze in Rotorua. Photo / SuppliedThe bystander said the fire was "burning really hot" and there was "tonnes of black smoke".
One Rotorua resident said he could see the fire from CBD while another could see the smoke from Harumana, on the other side of Lake Rotorua.
A police spokeswoman said there were police at the scene assisting with traffic control.
Traffic was being diverted at View Rd's intersections with Old Taupo Rd and Riri St.
More to come.
Thick, black smokes is billowing from a fire in Rotorua. Photo / Supplied