MFB Commander Paul Eckhold said the ceiling of the two storey building collapsed as fire crews wearing breathing apparatuses worked for nearly an hour to gain control of the blaze.
«Crews evacuated buildings on either side to ensure the safety of people in the area,» he said.
«At this stage, there are no reports of injuries.»
Hub Express owner, Fee Zreik, said the fire was burning for quite some time before firefighters brought it under control.
«There was so much smoke,» she said.
Russell Street between Little Bourke and Bourke Street is currently closed and people are being urged to avoid the area.
The cause of the fire is not yet known.