About 82 people were treated at the scene by paramedics, some for smoke inhalation, with video showing one resident climbing across the building to escape.
Four people were taken to hospital, including a man in his 40s with non-life-threatening injuries.
All patients are in a stable condition.
The police investigation has now finished, with officers saying the fire was not suspicious.
Queensland Fire and Emergency Services is continuing to investigate the cause.
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