Buchanan Galleries was locked down yesterday after fire crews raced to extinguish a blaze inside a wall in the basement of the multi-million pound complex.
Hundreds of shoppers and members of staff were evacuated after white smoke was seen inside the packed shopping centre.
Emergency services rushed to the scene when the fire was discovered at about 10.40am.
It is believed firefighters were forced to demolish walls to access the cavities to extinguish the fire.
Last night Glasgow City Council building control officers were called in to carry out an inspection of the building and it was business as usual from 9am today.
Yesterday firefighters cordoned off a pedestrianised area surrounding the Galleries on Buchanan Street, Sauchiehall Street and Killermont Street.
Members of staff gathered outside with customers whose cars were still in the Buchanan Galleries car park.
A shop worker described waiting for hours before being told to go home. She said: "We had been standing outside for a couple of hours when the centre management took all the store managers aside.
"They were all escorted inside by fire officers to allow them to collect any handbags and personal belongings and to put till money in the safe. Some workers are going to work at other shopping centres or stores but a lot are being told to go home."
Dozens of fire engines and support vehicles were in attendance, with more than eight appliances parked along Killermont Street at one point.
A fire service spokesman said firefighters had identified a deep-seated fire within the structure and began work to access and extinguish it.
Police were at the scene to direct traffic and emergency services remained at the scene last night.