The police are deliberately investigating the fire, which tear down through several shops at the center of Kilmarnock and caused partial collapse of the building.
The East Irshire Council has confirmed that parts of the listed building will need to be “as a case of urgency”.
At around 21:00 on Monday, the explosion broke on the ground of four-floor on the King Street.
The owner of a tattoo studio inside the block told BBC Scotland News that he “saw his livelihood burning”.
Firefighting remains on the spot with closing roads and nearby businesses.
CH Inspection Scott McCredi said: “We understand what the fire has affected the local businesses and I want to thank the public for their patience and help, while we make our inquiry.
“We are deliberately accepting the fire and our investigation is going on.”
He urged anyone who saw anything suspicious around the fire time. Contact police,
The Scottish Fire and Rescue Service (SFRS) stated that the building collapsed partially during the fire. Local reports suggested that the roof had mostly collapsed.
SFRS said there was no report of any injury, but the residents have been warned to keep their windows closed.
A spokesperson said that about 45 firefighters, six fire engines and two experts were struggling with fire at their peak in the early hours of Tuesday.
He said that two crew teams and an aerial equipment remain on the scene to make the area safe.
Nici Brown, owner of hard luck tattoos on King Street, said he had “nothing left” after the explosion.
Mr. Brown said that he was at home when he received a phone call to say that the building was a building on Monday night.
The studio was opened in the building only in June after all his savings in purchasing the shop by Mr. Brown.
“I have just burnt my livelihood,” he said. “It is like out of a film.
“I can see my shop on the floor, whatever I do myself, every bit.
“One of the boys asked to work on Monday on Friday and I said no, I asked him to take a day off, so he is lucky because he can happen when this happened.”
Mr. Brown said that local businesses had offered to help him and were aiming to “bounce” back in the future.
He said: “I feel terrible. Not only for me, everyone is impressed, all the people of the shop, all of us are fed hostage, children, even your dogs.
“Fortunately no one was in the building. Nobody has passed away or hurt, this is the main thing.”
A funderizer for business has already increased by more than £ 20,000.
East Irshire Council leader Douglas Reid said he was “deeply unhappy” from the incident, which was working to develop “new vision” for the center of the city as a council.
He said that the officials of the building standards had inspected the site and the initial signs suggested that the loss was “worse than what we had earlier imagined”.
Mr. Reid said: “For now many local business security concerns and road closure are unable to trade, and some have lost stock or operational disruption.
“Many small businesses have been forced to close on short notice, there is no clear indication when they will be able to reopen.
“We will not know to the entire extent of loss until business owners can reach their properties, and for some, this can cause a significant loss of income and endanger their ability to continue business.”
The leader of the council said that the local authority will soon start a recovery fund for local businesses and would support and affect different support and affected for strategic engagement with national chains and large employers.
He said that the loss of bonmarks had expressed concern over job loss, low footfall and long -term recovery of the town center.
“The event offers an economic risk that requires a coordinated and active response from the council and our partners,” he said.
Safety concern
Group Commander Paul Story of Fire Service said that the local crew called the scene was met with “important fire” and quickly requested a back-up.
Mr. Story told the BBC Scotland News: “The building collapsed during the incident and that is why we pulled our employees back into a safe area.
“We have closed areas due to the structure of the building and we are working with our colleagues to ensure that we make that area safe.”
He said that the crew were now dealing with warm places inside the building and most likely would be for “quite a time”.
However, he said that due to the fire, there was no initial indication that the SFR police would conduct a joint investigation with Scotland.
18 -year -old Kori McLean and Taylor Montgomery saw the edge of the building on Monday night when leaving for the last time.
Taylor said the fire really got out of hand quickly.
He said: “This is the worst thing I have ever seen.
“No one should go through it anywhere. It is absolutely terrible.
“This tattoo is a good community around the studio, there are good people around them and they are making the best of a bad situation.”
King Street remains closed up to its junction with St. Maarnock Street and sandbade lanes remain closed.
Several roads leading to King Street and Sandbade Lane were closed, but have been reopened since.
The Burns Mall Shopping area was closed, but now it has opened again.
Scottish Water warned the locals that their efforts to fight the fire could cause their water supply obstruction.
The East Irshire Council urged pedestrians and drivers to escape the area and keep the roads clean.
A police Scotland spokesman said that interrogation was going on due to the fire.