The fatal accident occurred at 450 North Bridge Road.
The Singapore Civil Defence Force (SCDF) and the police told The Straits Times they were alerted at about 11.30am.
The Bangladeshi worker was found trapped in a narrow gap between a lift carriage that was between the second and third storeys of the building and the metal support structure of the lift.
Extricating the technician took about six hours, in what SCDF said was a highly complex and delicate operation.
It required officers from SCDF s elite Disaster Assistance and Rescue Team and other fire station personnel to operate a slew of rescue equipment within the confined space of the lift shaft.