Local TV channels aired footage showing debris and mangled metal around a coffee shop, Xinhua news agency reported.
Dozens of those injured, mostly women, have been sent to hospitals.
The collapse occurred shortly after the conclusion of morning stock trading at 12.10 p.m. local time. Later, the country's stock exchange administrator ordered resumption of trading.
A witness said it happened during lunch break time where many people were below the tower 2 floor that collapsed.
"It was very crowded here as there was a student visit programme going on when the collapse occurred," the witness said.
National police spokesman Inspector General Setyo Wasisto said investigators would probe blueprint of the building after the incident.
"Every building has its own blueprint, so there must be information stipulating how long a building will remain strong," he said at the police headquarters.
The spokesman confirmed that the cause of the incident was not an explosion.
The country's financial services authority also supported the investigation, said head of international division of the authority Anto Prabowo.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
