The leader of Brighton and Hove City Council has said he will step down.
Councillor Bill Randall, the country’s first Green Party council leader, has been in the job for less than a year.
He took the post when the Greens became the largest party at the local elections in May.
At a meeting of the full council he became mayor-elect. He is due to take over as mayor next May.
The Conservatives nominated Councillor Denise Cobb but were outvoted by Labour and the Greens.
The current mayor, Councillor Anne Meadows, will become deputy mayor from May.
The Greens have not yet said when they will choose a replacement.
Councillor Randall, 68, represents Hanover and Elm Grove and has a particular interest in housing policy. He founded Inside Housing, one of the leading magazines for the housing profession.
He also has a strong interest in economic issues and the welfare of young people, particularly those in care.
He said: “It was always my intention only to serve as leader of the council for a year and I think, with my experience as both convenor of the Green Party and leader of the council, I can bring a great deal to the role as the city’s first Green mayor.
“It’s an extraordinary privilege to be chosen as mayor of this city which is a very special place to live.
“I’ve established very good relationships with a large number of organisations across the city and I will further develop those relationships for the good of the city in my year as mayor.”
Councillor Geoffrey Theobald, leader of the opposition Conservative group, said: “I wish Bill well. I’m sure that he will be a good mayor.
“It is surprising that having been the convenor and become council leader that he should wish to give it up so soon after taking office.
“Usually leaders of councils enjoy their position because they are leading an administration whereas the mayor is a figurehead and indeed sadly it appears that the mayor’s position is not as prominent as it used to be.”
Councillor Gill Mitchell, leader of the Labour group, said: “It is surprising that after just seven months the Greens are easing out their leader and making him mayor.
“I am sure that Bill will make an excellent mayor for the city but hope that this move does not reveal more division and disarray within the Green administration when they should be working in the best interests of the city in difficult times.”
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