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Confirmation of the sum involved emerged yesterday, as the council - which is fronting the city's bid for PGF funds - continued to work with Ministry of Business, Innovation and Employment officials on the application.
The Otago Daily Times has previously reported only that the city was seeking a major allocation from the fund, understood to be $50 million or more.
Former city councillor Hilary Calvert, in a column published earlier this year, had suggested the "eye-watering" sum being sought could be twice that amount, at $100 million, but the parties involved have refused to confirm exact figures.
But, posting on social media in recent days, Cr Lee Vandervis may have inadvertently confirmed the figure - until now discussed only behind closed doors - was $100million.
In a post discussing the council's planned investment in a pedestrian and cyclist bridge to the waterfront, he said spending on the bridge was a "prerequisite for $100 million of Provincial Growth funding".
Cr Vandervis' post was removed yesterday, but came just weeks after councillors received an update on the waterfront project during the non-public part of last month's full council meeting.
Cr Vandervis did not respond to a request for comment yesterday.
The money being sought would pay for replacement wharves, walkways and building platforms needed to provide public access, prepare the site for development and unlock private investment in the area.
Among MBIE's requirements was a business case showing the project was commercially viable, which had already led to some design changes, and talks were continuing including on the sum being sought.
The changes included shifting planned buildings inland, rather than relying on harbour reclamation or building out over the water, and staging the hotel component of the plan.
But, eight months after the city's Provincial Growth Fund bid was first submitted, none of the parties involved would be drawn on the sums involved, or the progress of the bid process, in recent days.
Dunedin City Council community and planning group manager Nicola Pinfold would only say that after discussions with MBIE staff, the council had submitted "additional information" to support the bid.
It was not known what the information involved and Ms Pinfold referred other questions to MBIE staff.
A spokeswoman for MBIE's Provincial Development Unit would not elaborate, including on the money involved, saying only Dunedin's application remained "under consideration".
"A decision will be made in due course."
A spokeswoman for Regional Economic Development Minister Shane Jones, who previously confirmed the sum involved was part of ongoing discussions, would only reiterate ministers were yet to receive a bid.
Mr Jones has previously spoken enthusiastically about the waterfront project, saying it would be "iconic and transformational" for the city and unparalleled in scale in New Zealand.
Fund rules allowed MBIE officials to sign off on applications worth less than $1 million, while those between $1 million and $20 million required delegated ministers' approval and those over $20 million required a Cabinet decision.
It was not clear yesterday whether the sum being sought had changed since November as a result of the ongoing talks.
Damien van Brandenburg and Dunedin businessman Ian Taylor, the men who first fronted the waterfront development vision, also had no comment yesterday.