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Cr Vandervis, a four-term councillor, confirmed this afternoon he would again seek the Dunedin mayoralty as well as to retain his city council seat.
His announcement came after Cr Vandervis - the highest-polling council candidate at the last election - challenged unsuccessfully for the mayoralty in 2010, 2013 and 2016.
Dunedin Mayor Dave Cull announced earlier this year he would stand down rather than seek a fourth term as mayor, opening the door to a flurry of challenges including from incumbent councillors Jim O'Malley, Christine Garey, Aaron Hawkins and Andrew Whiley.
Cr Vandervis joined them today, saying he represented a change from the "indifferent leadership and a lack of vision'' in recent years.
His focus would be on careful investment and reducing council debt while promoting economic wellbeing, financial and environmental sustainability, and a high quality of life "on an affordable basis''.
Earlier today, Cr Elder, a first-term councillor who stood unsuccessfully for the mayoralty in 2016, announced her plans, saying she would again seek a council seat and the mayoralty in October's local body elections.
She wanted to focus on economic growth and jobs, including in Dunedin's exciting start-up space, as well as championing South Dunedin and the city's walking tracks, outdoor lifestyle and access to nature.
She also wanted to see more progress on a raft of issues facing the city, from housing, traffic and parking problems to the future of waste, growth and climate change.
Nominations close at noon on Friday.