Wellington City Council will progress with an investigation into Mayor Andy Foster after a councillor lodged a formal complaint about his behaviour, the Herald understands.
Before councillors voted to sell and lease council-owned land at a meeting two weeks ago, Councillor Jenny Condie revealed she had made the complaint.
Condie claims Foster showed her information the morning of the vote she believed he did not have permission to share, and was potentially defamatory to a former council officer.
"These allegations are similar to those which were heard by the High Court in 2018 and dismissed. I believe it is extremely unwise for the Mayor to attempt to unfairly besmirch the professional integrity and probity of a former Council officer," she said in her complaint.