Fire fighters spent an hour to put out the blaze, which reportedly started on a third-floor tool shop.
Owner of car accessory shop, Waree Alongkornwutthichai, said she lived in a nearby alley and heard someone say there was a fire at the tool shop. She rushed to help extinguish the fire but it was spreading too quickly.
Pol Col Montri Theskhan of the Plapplachai 1 Police Station said that police are investigating the cause of fire and assessing the damages.
The fire scene was sealed to prevent people from entering.