The fire is said to have started around 9am in a storeroom that had a fridge and a heap of papers. Deputy Chief of Fire Micah Seno said they are still investigating the cause of the fire.
"We managed to control the fire before it could engulf much of the building, but the only problem is that the emergency exit was locked and a security guard ended up injuring himself in the process of breaking it so that people could go out," said Seno.
He added that they have realised that in most instances, the fire is caused by lack of adherence to safety standards.
He said although smoke covered the whole building, the fire was extinguished in a short period of time.
BOCCIM Chief Executive officer Maria Machailo-Ellis told Mmegi that all members of staff managed to get out of the office safely.
"I am not sure whether the emergency exit was locked but I can confirm that we do open it sometimes," said Machailo-Ellis.
She said that the incident affected their operation as they spent some time cleaning the mess that resulted from extinguishing the building. Officials from the fire department say besides the security guard and a woman who suffered from too much smoke, there were no other injuries reported.