It happened around 8 a.m. at 170 Tillary Street, a building under construction.
Authorities say the investigation determined the three elevator mechanics were standing on a working platform inside of the elevator shaft at the fourth floor when the platform gave way and the workers fell to the bottom of the elevator pit.
The three victims were taken to Methodist Hospital with non-life threatening injuries.
The Department of Buildings' investigation is active ongoing, and enforcement actions are pending that investigation.
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