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Auckland City Council inspectors were assessing the safety of a central city building today after a pane of glass fell 12 storeys to busy Wyndham St while many office workers took their lunch break.
The broken window was about 1m by 1.5m and the third to fall from AMI House in a year.
Council building inspectors were at the site today and late yesterday.
Council's acting manager for building policy Mark Urlich said abseillers checked the windows on the building this morning but nothing was found.
"We can't determine whether any more windows will pop between now and next week but we could say the same for any other building in the city really because this isn't the only building in the city that windows fall out of," Mr Urlich said.
He said a stage is being built in the building's carpark and will be lowered from the top of the building to inspect the windows.
Mr Urlich said it was still not clear what caused the window to fall.
"I've got my theories but I'm not prepared to comment on that," he said.
The AMI House building manager, Bob Rogers, said the reason for the accident was not known but he would be looking into it.
"Since it happened last time, we've had the windows looked at."
He said no issues were apparent after the inspection.
"We have the windows cleaned on a regular basis and the cleaners advise us if there are any problems, but it's a bit of a mystery."
Mr Rogers said the previous breaks happened in the summer when the weather was hot and it was thought that could have been a cause.
But he said that was unlikely to be the problem this time.
Mr Urlich said the building manager was keen to get the problem "sorted out".
He said tenants of the AMI House had contacted the council about the problem.
A policewoman at the scene yesterday, who declined to give her name, said no one was injured.
"We're very lucky."
Senior Station Officer Barry Fox said firefighters had no idea how the window was broken.
"There was no human involvement, maybe it was some sort of movement."
Some passers-by ignored the safety cordon and walked underneath the building with their bags over their heads.
