Rescue workers with India's National Disaster Response Force said that up to 20 people were still feared to be trapped in rubble from the building, which is located in Bhendi Bazaar, a densely populated residential neighbourhood where many structures are almost a century old.
90 NDRF personnel along with fire fighters have joined the rescue work at the site.
Eleven people had been confirmed dead, and 14 had been injured and taken to hospital, with four firemen also injured, the chief fire official said.
Mumbai firefighters were also trying to extinguish burning debris that could further endanger people who were still trapped in the building. The building was situated in the densely populated area of Bhendi Bazaar.
Rescue workers clear debris from the site of a building collapse in Mumbai, India, Thursday, Aug. 31, 2017.
A woman said the building also housed a nursery-cum-playgroup.
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The collapse came as Mumbai recovers from heavy monsoon rains on Tuesday that flooded the city.
"Collapse of a building in Mumbai is saddening".
The building was among 791 that the city's municipal corporation had listed as risky, but residents often refuse to leave, and as a result, only a few of these buildings have been evacuated or demolished.
The Chief Minister said action will be taken in case of any negligence. But despite knowing everything, Mumbai Building Collapse is a common phenomenon.
Manoj Sharma, a police official, told the AP that nine families lived in the building. State Minister Subhash Desai said the government will conduct an inquiry into the building collapse. Half of those living had vacated while six to seven families were still living there, ' said the local politician, who is a member of the Legislative assembly (MLA) of the area Amin Patel.
The SBUT, run by the Bohra community, was granted the rights to redevelop a cluster of old buildings in the area, including the collapsed building.
On the month of July, a Mumbai Building Collapse was reported in Ghatkopar, when 17 people died.
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