Collapsing Sydney building torn down

A building in Sydney's inner west that partially collapsed is being torn down.

The vacant two-storey building in a row of shops and units on Liverpool Road at Enfield collapsed into an adjacent construction site late on Monday night.

Structural engineers were called in to asses the integrity of the structure.

Forty people from neighbouring properties were evacuated as a precaution, but only four people were impacted, a NSW police spokeswoman told AAP on Tuesday.

Motorists are urged to avoid Liverpool Road.