TENANTS of a building on Wellington Street were ordered to leave last week after it was deemed to be unsafe.
The Start360 group, which offers support services to young people, were informed they would have to leave their offices on Wednesday after part of the cornice fell from the facade.
It is thought that the hard frost of last winter has caused parts of the building to be deteriorate.
A spokesperson from Building control within Mid and East Antrim Council said the decision was made quickly to cordon off the footpath.
"With the recent icy weather it caused part of the cornice to fall on to the footpath and were concerned that other areas might be the same so we had to cordon off the building.
"Currently work is being carried out to chip out any loose bits of material on the facade of the building which will allow us to have the area open to pedestrians and Start360 within 24 to 48 hours.
"There is no risk to the main structure of the building it is just the original render which has come with the age of the building. There will be a more substantial work carried out in the future to the building but at the minute nothing has been confirmed."
A spokesperson from Start360 said they were able to move any planned activities to the building directly opposite.
"We have another office directly across the street in Ballymena – any group activities planned for the closed office will be postponed until we can reopen.
"Service users are being kept informed."
The building on the corner of Wellington Street and Lower Mill Street was once home to Sam's Boutique, one of the town's best known clothes shops for many years.