A total of seven fire engines and two aerial appliances are presently in attendance at Killermont Avenue, on Friday, September 21.
At its height, up to 70 firefighters and ten fire engines were mobilised the scene after the alarm was raised at 9.20pm on Thursday, September 20.
Crews worked through the night to tackle the large fire which had taken hold within the roof space of the three-storey building.
There are no casualties.
Group Manager Thomas Sinton is currently the officer in charge of the incident.
He said: "This has undoubtedly been a challenging and protracted incident, and there is still work to do as our crews remain on scene this morning.
“But I would like to take this opportunity to praise the response of firefighters – they have been outstanding.
“This is one of the oldest golf courses in the world, I am very pleased to say that our crews were able to assist in salvaging some of the interiors within this historic building.
“I would also like to thank our teams in Operations Control for working effectively with our partners through the night and into this morning.”