Two large windows at Adelaide's State Administration Centre have been smashed with a hammer, with police searching for the man responsible.
Riding a pushbike, the man stopped in front of the Victoria Square building early on Friday morning before attacking the glass panels and then riding off.
He is described as having a beard and wearing black Adidas track pants, a black vest with grey top underneath, a grey beanie and black and white shoes.
He was also carrying a large backpack.
The State Administration Centre includes a number of ministerial offices, including those of Premier Steven Marshall and Treasurer Rob Lucas.
Police have asked anyone with information about the incident to come forward.
Australian Associated Press