David Jones shut its doors and turned customers away following the man's death, while other shops are expected to remain closed while detectives investigate.
It is understood that the man's death was an instance of self-harm, and is not being treated as suspicious.
A second person was treated by paramedics for minor injuries.
If you or anyone you know is seeking support and information about suicide prevention, you can can contact Lifeline on 13 11 14 or visit BeyondBlue.
This article originally appeared on New Idea.