The two-storied structure caved in during early hours of yesterday in New Muslim Colony, they said.
The deceased was identified as one Balasaheb Hassle (21), whose body was taken out of the debris this morning. All 19 were part of a 25-member group working with a private company here and staying in the building on rent, police said.
Police have registered a case against the landlord and also the builder who constructed the building.