Over 50 employees of the company whose office was located on the first floor were rescued while 27 bodies have been found.
The fire department said the four-storey building, which did not have a fire safety certificate, had a single entry and exit point.
According to the list of DFS, there are more than 100 such buildings in Lutyens' Delhi alone.
Several people had taken shelter under the recently constructed structure while it rained. The dead, all of them men, were mostly relatives or neighbours of Jai Ram, who was being cremated at that time, officials said.
Twenty-five tenders were rushed to the spot to douse the fire.
Twenty-four people, most of them attending a funeral, were killed and 17 others injured when the roof of a shelter at a cremation ground in Uttar Pradesh's Muradnagar collapsed on Sunday, police said.
The fire broke out at 2.15 pm on the terrace of the six-storeyed building, which is located in the high security India Gate-Parliament House area, the Delhi fire department said.
The driver and the conductor of a bus that got stuck at the Minto Bridge underpass due to waterlogging were rescued by fire department personnel, officials said.
Delhiites woke up to the sound of thunder and lightning this morning and, according to the weather department, the city recorded 117.9 mm rainfall from 5:30 AM to 2.30 PM.
The fire department said they received a call around 4.23 am about a fire in the factory at Udoh Nagar area after which seven fire tenders were rushed to the spot, the official said.
Following the gruesome incident, Adityanath had announced a compensation of Rs 40 lakh for Singh's wife, Rs 10 lakh for his parents and a government job for a member of his family.
The entire area has been cordoned off and National Disaster Management Authority has also been informed about the incident.
Given the controversy over Uttar Pradesh's population control moves, Hemant Shivsaran/Rediff.com digs deep to find out how many children BJP MLAs in UP have.