Police have declared a crime scene, and fire investigators were called to the hotel on Saturday morning.
The section of Logan Road between Walker Street and Balaclava Street remained closed for safety reasons.
Anyone who witnessed the fire or has relevant footage is urged to contact police.
Police were at the Woolloongabba hotel on Saturday morning after declaring a crime scene.Credit: Sarah Moran
The building has now endured three fires, the first in 2010. It went up in flames again in 2018, and no longer has a roof.
Broadway Projects Qld Pty Ltd bought the hotel from Malcolm Nyst in August 2021 for $8.8 million.
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Multiple previous owners tried to develop the site but were knocked back on heritage grounds.
Plans lodged with the state government in October last year aimed to incorporate the heritage-listed landmark into a 34-storey tower.
Under the plan, the gutted hotel would be restored and reopened as a hospitality venue.
Reconstruction of the original staircase and internal fittings was also planned.
An air-raid shelter built during World War II and outbuildings at the rear were to be demolished.
The tower would be built directly behind the hotel, with 282 apartments.
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