Firefighters have extinguished a fire on the second floor of the Bega Court Flats on Cooyong Street in the City.
ACT Fire & Rescue has three pumpers, the hazardous materials unit, the Bronto aerial unit and a commander on scene.
The flats were unoccupied. Firefighters are now conducting atmospheric monitoring of the site. Investigations into the cause will begin soon.
The ACT Ambulance Service is also on scene. No injuries reported.