Firefighters are tackling a major fire at the Gulf Harbour Country Club on Tuesday morning.
More than 50 firefighters from across Auckland have been fighting the blaze on the Whangaparāoa Peninsula, which is still burning after more than six hours.
It's the second fire to happen at the abandoned golf course in just three days.
Fire and Emergency (FENZ) Assistant Area Commander Shaun Pilgram told Newshub multiple calls were received just before midnight.
"The fire was elevated to third alarm level, with 17 fire appliances and 50 personnel deployed."
He said due to the risk of the building collapsing, firefighters are working to put out the blaze from outside the building.
"Firefighters were helped at the height of the fire thanks to light wind and open golf courses surrounding the building, reducing the risk of the fire spreading."
Pilgram said it's unknown what caused the fire; however, fire investigators have been told that even once the fire is extinguished, the building will likely be too unstable to enter.
Police said they were called to assist FENZ with the fire at 11.52pm.
"At this stage, the fire is being treated as unexplained and enquiries by emergency services will continue this morning to determine the full circumstances," police said in a statement.
"A scene guard will also remain in place until a fire investigator can attend."
"Anyone with footage or information that may assist is asked to contact Police via our 105 phone service, referencing job number P058799465. Information can also be provided anonymously via Crime Stoppers on 0800 555 111."
Over the weekend FENZ also responded to a small fire in the golf course's 'pro shop'.
