A fireplace has gutted a former hat manufacturing unit in central Sydney. (Dean Lewins/AAP PHOTOS)

By Kathryn Magann in Sydney

POLICE and investigators from Fireplace and Rescue NSW will comb by means of the wreckage of a former hat manufacturing unit and one other empty constructing that had been engulfed in flames within the Sydney CBD.

Crews had been known as to Randle Road in Surrey Hills on Thursday afternoon to search out the 2 multi-storey buildings utterly alight.

Police arrived shortly afterwards to cordon off the scene, with close by streets closed off and the jap suburbs mild rail line shut down.

Close by residents had been ordered to evacuate, as the fireplace despatched plumes of poisonous smoke into the sky.

The one reported harm from the fireplace was a minor burn suffered by a firefighter.

There was minor injury to close by buildings, primarily from the intense warmth.

The fireplace was described on Thursday by Fireplace and Rescue NSW Performing Commissioner Jeremy Fewtrell as one of many largest fires within the metropolis for years.

He stated it was fortunate nobody was badly damage within the extraordinarily harmful situations.

The blaze noticed 120 firefighters attend, with the fireplace declared principally contained by round 7pm.

Fireplace investigators had been on the scene to attempt to decide the reason for the blaze and police may also examine.