The fire service said the fire at the ‘BTI Premier Plaza’, in Badda, started around 3am on Wednesday and took 26 fire-fighting units more than three hours to tame it.
The building has shops from the ground floor up to third floor, while the rest is residential apartments.
No casualties have been reported, said police.
Quoting witnesses, the authorities said that the fire started at furniture shop on the first floor.
Locals spotted the flames, as most of them were awake for the Ramadan ritual of Sahri (the meal before starting to fast) when the fire broke out.
Building residents were evacuated to safety before the fire spread to other floors.
However, those in the upper floor apartments went to the roof to save themselves.
The damage caused is yet to be assessed.
The fire-service has already initiated an inquiry by a five-member body, said Fire Service Control Room official Mahmudul Haque.