The Glasgow School of Art “will be saved” after it was gutted in a massive blaze, according to its director.
Construction experts have suggested the Mackintosh building could be so badly damaged, it would have to be torn down.
But Professor Tom Inns told BBC Scotland: “This building is not beyond saving – absolutely. It will be saved in some form.”
It came as Glasgow City Council leader Susan Aitken said their focus was on saving the historic landmark.
“We are certainly not writing off the Mackintosh building yet,” she said.
Firefighters have been at the scene of the blaze, which also devastated the nearby O2 ABC music venue, for more than 72 hours.
At its height, there were more than 120 firefighters involved in the operation. Three appliances remained at the scene on Monday where crews were working to extinguish pockets of fire.
It is the second time in four years that the art school has been damaged in a major fire.
The Mackintosh building was at the centre of a £35m restoration project when the blaze broke out on Friday night.
Prof Inns told BBC Scotland that drones have been flown over the site in a bid to assess its condition, and confirmed that the shell of the building was intact.
“It can be rebuilt,” he said. “We have got very close to rebuilding it from the previous fire.
“We have got a very experienced team now that understands this building intimately but rebuilding it is going to be a very, very complex process.
“We are going to have to stabilise the building, then we are going to have to think very, very carefully about what the strategy might be moving forward.
“That’s something we are going to have to discuss.”
Muriel Gray, the head of the board of governors, said they had been overwhelmed with messages of support from around the world.
“There is a huge desire to see Mackintosh’s masterpiece rise again, one which we all share,” she added.
In an interview on Good Morning Scotland, Ms Aitken said initial superficial assessments have carried out by officials including building control officers.
“Certainly I think the consensus is that there is hope and and we are certainly not writing off the Mackintosh building yet,” she said.
“Our intention, our focus will be to try and save that building and finding a future for it, but it’s very early days.”
One expert has suggested the cost of restoring the building after the latest fire could be more than £100m.
When Ms Aitken was pressed on whether she was willing to back restoration at any cost, she replied: “It’s far too early to start talking about cost.
“We have seen lots of figures flying about but they are purely speculative.
“There’s no one who’s able to put a price on this at the moment.”
Building expert Billy Hare compared the blaze to that which gutted the building housing Victoria’s nightclub on Sauchiehall Street in March.
The professor of construction management pointed out that the council very quickly took the decision to demolish that building.
But Ms Aitken said that decision was taken because it was unstable and in danger of “imminent collapse”.
“That’s not the case, we think, with the Mackintosh building at the moment,” she said.
“Having said that, it is very early days. The initial assessments are that what remains of the building is largely structurally solid but it is really, really early days.”
She said there was a consensus that the council should work with other organisations including the Scottish and UK governments to restore the building if it is possible.
“But there are many, many issues to be explored before we can give definitive answers on that,” she added.
Meanwhile, traders on Sauchiehall Street have warned that the fire could spell the end for some businesses in the area.
Donald MacLeod, the owner of the nearby Garage nightclub, said trade was already down as a result of roadworks connected to a planned regeneration of the area as part of the Glasgow City Deal.
He said the fire was a “hammer blow” to dozens of local traders. “They are bereft and looking for help,” he said.
Many have been closed since Saturday as they are inside a safety cordon put in place by the fire service.
He said the roadworks had hit footfall and had a “calamitous” effect on some businesses, who fear the effect of the fire may be “terminal”.
Ms Aitken will lead a meeting later with business representatives on the future of Sauchiehall Street in the wake of the fire.
She said businesses inside the cordon set up by the fire service are being invited to apply for zero-rating on business rates.
On Monday, fire investigators promised to find out what caused the blaze.
Assistant Chief Officer David McGown said a “comprehensive and professional” probe will be carried out.