According to a senior fire official, the notice would be issued once the inquiry report was ready within the next few days.
The official added that the blocking of ventilation space in the basement was reason enough to serve the Tata Group a notice for violation of fire safety norms.
During inspection, fire brigade officials found 50 windows in the basement, of which 33 were closed. Twenty were boarded with plywood and 13 were used for installing air-conditioners and exhaust fans. The reason for the death of the three men when the fire broke out was suffocation.
Chief fire officer Uday Tatkare confirmed that they would be issuing the Tata Group a notice and were still preparing the inquiry report.
Investigations had also revealed that the auditorium, cafeteria and offices did not have the mandatory no-objection certificate from the fire brigade.
Civic officials said the cafeteria had been functioning without the mandatory licence from the civic health department.
The Bombay House building situated near Flora Fountain Bombay was constructed in 1924 and is a Grade II heritage structure.The rooms in the basement were constructed in 1988 and some permission were obtained in 1990.
BMC officials had claimed that the basement plan approved at the time showed a sports club in the space and was to be kept open.