Demolition of 61 Molesworth Street has started this afternoon.
At about 4pm the council gave the go ahead for contractors to start deconstructing a small building attached to the main office block.
A digger with a hydraulic hammer attached to it could be seen drilling through the building while the area was doused with water to control any asbestos particles in the air.
A high-reach crane will soon move on site to start demolishing the top floors over the weekend.
