More than two dozen firefighters descended on the PwC Tower in downtown Auckland on Tuesday night.
A Fire and Emergency spokesperson said teams were called out just before 9pm after an alarm activated.
Seven fire trucks were on the scene - with the fire on the 25th floor of the building - which sits on Customs Street West.
The 180m, 41-level building owned by Precinct Properties is the second tallest structure in Auckland behind the Sky Tower.
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The electrical fire had since been contained.