The council’s South Dunedin future programme manager, Jonathan Rowe, said the initial estimated cost of the plan was $132m over an initial five-year period, based on buying 65 properties a year.
The buying-up of property could begin as early as next July.
“This approach could help South Dunedin get ahead of the problem, be more resilient, provide certainty and reassurance to the community, and save ratepayers and taxpayers money in the long term.”
In the short term, property could be retained and potentially rented to maintain housing supply and provide a revenue stream.
Later, the property could be used for a range of adaptation projects — pumps or pipes, parks or wetlands, or new more resilient housing developments.
The council needed Government help to go ahead with the plan.
“It’s probably at a scale where we can’t really do it on our own, so we would need Government help.”
Rowe said it was “unfortunate” the council’s discussions with Treasury had leaked to the ODT, but he did not have significant concerns about the public finding out.
Dunedin Mayor Jules Radich called the plan “proactive and ambitious”.
“If we start acquiring property today, it will give us more options tomorrow, meaning we’ll be better placed to build a new pipe, expand a park, or move a house — whatever is required to make South Dunedin a safer and better place to be,” Radich said.
A Treasury spokesman confirmed it had been approached by the council, but said it was unable to provide further information while the matter was under consideration.