The fire broke out around 1:40 pm (local time) in the office building called 'Yuansheng International', owned by the property developer Greenland, in Zhengdong New Area, said an official with the city publicity department.
According to the official, the fire was initially seen on the building's thermal insulation layer.
The flames swept through the building facade and burnt window frames were seen falling down, the state-run Xinhua news agency reported.
So far, no casualties had been reported, and firefighters were working to douse the flames, the report said.