The Richmond Valley Council office at Casino was broken into on Friday night but police are still trying to work out what if anything was stolen.
Police say the office was broken into about 2:30am on Saturday morning.
They believe the would-be burglar smashed an office window at the rear of building with an outdoor timber chair. The offender has then climbed through this broken window and entered several offices.
Alarms were activated and police and security were on the scene soon after.
The incident was caught on CCTV. The offender is described as a male of Aboriginal appearance with short dark hair, thin to medium build and of an average height. He was seen to be wearing a black cap, black jacket/jumper, dark blue jeans and was carrying a black shoulder bag.
CCTV is being reviewed, and forensic procedures are being carried out.
If you can assist with this matter please call Casino Police on 6662 0099 or call Crimestoppers on 1800 333 000. All calls are treated with the utmost confidentiality. Police reference is E120767402