“Authorities are currently investigating, so the site is closed until further notice.”
Fire and Emergency New Zealand said it was notified of the fire at 11.30pm on Friday and five crews responded.
The fire was “well involved” when firefighters arrived and is considered suspicious, they said, referring further inquiries to police.
Police said they were notified by Fire and Emergency of a fire on Kerikeri Rd shortly before 1am today. A scene guard was posted at the site overnight.
Police and a Fire and Emergency fire investigator would be at the scene today, looking into what caused the fire.
Reroofing work is being carried out at Kemp House, with the aim of having it finished by summer.
In 2023, a large stand of gum trees near the Stone Store were poisoned, creating a risk they could fall on the building.