They were declared dead at the state-run J J hospital, where they were taken after being pulled out of the debris, as rescue teams with heavy machinery continued to look for survivors of the crash, a senior police official said.
About 30 others are still feared trapped under the mounds of concrete and twisted iron rods.
The process of identifying the bodies is on. At least 12 people injured in the incident were carried out on stretchers and rushed to the J J Hospital in ambulances that faced difficulty in navigating the narrow streets due to the crowed that has gathered around the place.
Fire brigade officials said some nine families lived in the dilapidated Husaini Building.
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The building also housed a play school but children had not arrived yet when the tragedy occurred.
The building, mostly housing lower-middle class families, was located in the Muslim-dominated Pakmodia Street close to the J J Hospital.
The building, which also had six godowns on the ground floor, crumbled at around 8:30 a.M. It is not clear yet if the heavy rains that inundated Mumbai this week weakened the building.
Rescue workers in hard hats clambered up the mound and banged large concrete slabs with hammers to reach underneath and pull out survivors and bodies. Cranes and bulldozers were also deployed to scoop up the debris. Residents helped with bare hands.
Maharashtra Chief Minister Devendra Fadnavis visited the spot and announced a solatium of Rs five lakh each for the next of kin of the deceased. He also said that the entire medical expenses of those injured will be borne by the state government.
"Our priority is to pull out at the earliest those trapped under the rubble of the dilapidated building," said state Industries Minister Subhash Desai, who is also the guardian minister for Mumbai.
"Once the rescue work gets over, the government will conduct a probe to ascertain the factors behind the building collapse. Strict action will be taken against those found guilty," he told reporters.
Revenue Minister Chandrakant Patil and a host of local politicians and corporators also visited the collapse site.
The MCGM rushed its emergency rescue team followed by ambulances, dumpers and earth-movers to the spot. Soon, 90 personnel of the National Disaster Response Force (NDRF) also rushed to the spot.
"We immediately rushed fire brigade personnel to the site to rescue the trapped people," a senior MCGM official said.
The rescue operation is being carried out by the NDRF team with the help of fire brigade personnel.
The incident occurred two days after the city was pummelled by torrential rains, which may have caused damage to the building.
The Saifee Burhani Upliftment Trust (SBUT), which was to have undertaken redevelopment of the 117-year-old structure, said the building housed a total of 13 tenants -- 12 residential and one commercial. "Of them, the trust had already shifted seven families in 2013-14," it said in a statement.
"MHADA notices dated March 28 and May 20, 2011, declaring the building dilapidated, were issued along with an offer of transit accommodation to the remaining tenants and occupants," it said.
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