Makhura’s spokesperson Phumla Sekhonyane said the cause of the fire was not known.
All city officials have been evacuated and Johannesburg Emergency Services are on the scene, dealing with the blaze.
Mahkura was not at the office, as he is attending the ANC policy conference.
“A section of the Office of the Premier building at 30 Simmonds Street in Johannesburg is on fire. The Johannesburg Fire Department is on site dealing with the matter‚” the Premier’s office said in a statement.
“All officials have been evacuated and are safe. The City of Johannesburg Fire Department will investigate the cause of the fire and the damage thereof. Once the fire department has established the cause of the fire‚ it will be communicated to the public.”
— Stevel Marc™ (@StevelMarc) June 30, 2017