A massive fire broke out in the office of the stock broking firm on third floor of the building on April 25, killing four women and injuring about 10.
The demolition process of the top two floors, built without plan approval, began as per a Madras High Court order.
Earlier, the owner had obtained a stay from the court agaisnt demolition.
Officials from the city corporation and Local Planning Authority, started the process this morning, in the presence of large number of police personnel.