New measures are being introduced to tighten security at the council’s city-centre headquarters.
Work will be carried out over the next six weeks to safeguard staff entrances to Marischal College on Queen Street and Littlejohn Street, including improvements to CCTV, installing new security barriers and introducing a new ID badge office.
Arrangements at the Town House are also under review.
Police have been called to numerous incidents at the council HQ since it opened to the public, including an alleged firearms incident earlier this month.
In March last year, Witold Jozefowicz was jailed after abducting a council worker and holding her at knifepoint because he believed he was being chased by the Russian mafia.
And in May, Scott Mercer was also jailed after he admitted threatening to burn down the building, refusing to leave it and behaving in a “threatening or abusive manner” to staff.
Council chief executive Angela Scott has issued advice and security tips to staff as she informed them about the upcoming work.
“Given the absence of physical security on some of the entrances to our premises, your vigilance when entering, working in or leaving a building is crucial,” she said.
A source at the town house said: “You get people who come along just looking to have a fight with staff so it’s important that everyone is safe.
“There have been loads of incidents in the main customer service area.”
An Aberdeen City Council spokeswoman said: “Improvement works to security at Aberdeen City Council’s headquarters, Marischal College, are to begin this weekend.
“The work, which will continue for the next six weekends, will be focused on staff entrances from both the Queen Street and Little John Street areas and will not affect the wider public.
“But we are also reviewing further security arrangements for Marischal College and Town House more generally.
“This review is about taking a more prudent approach to staff security and public safety in more easily accessible areas.”