The unauthorised four-storey 'Tahir Biznor' building, situated in Navi Basti area, had collapsed yesterday.
Regional Disaster Management Cell chief Santosh Kadam told PTI that the fourth deceased was identified as Parvin Khan (65).
The other three deceased were Ruksar Yakub Khan (18), Asfaque Mustaque Khan (38) and Jaibunissa Rafique Ansari (61).
The officer said nine people were injured in the collapse and they were admitted to various hospitals.
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A case under relevant sections of the Indian Penal Code (IPC) and the Maharashtra Regional and Town Planning Act was registered against the building's owner, a senior police official said.
The accused, Mohammad Tahir Rafique Ahmed Ansari (46), was absconding, he said, adding that efforts were on to nab him.
Bhiwandi Tehesildar Shashikant Gaikwad had said the building was over ten years old and it was not in the list of dangerous buildings.
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