A MASSIVE fire has broken out at a building under construction near Circular Quay train station.
Fire and Rescue have sent 13 crews to battle the blaze which has completely engulfed the construction site on the corner of Pitt and Alfred streets.
A Fire and Rescue NSW spokesman said all site workers have been evacuated.
"We have eight crews on scene at the fire which is at a building under construction," he said.
"There are reports the exterior scaffolding nd sheeting is alight, at the moment the response is a third alarm, in addition we also have five crews on the way.
"All people have been evacuated as per the on site supervisor.
"Crews are working and attacking the fire from the outside of the building but there is a lot of smoke in the area.
"Firefighters have established an exclusion zone around the area and it is still an active fire at the moment."
Masses of black smoke can be seen across the city as crews attempt to bring the blaze under control.