The repairs to six leaky and mouldy Middlemore Hospital buildings will cost at least $123m.
It was last week revealed that the buildings are in urgent need of repair, and Counties Manukau District Health Board says the government will need to step in with extra funding to get the problem fixed.
Documents obtained by RNZ show that hospital management was aware of the problem for years, but have not fixed it.
The buildings were built around the turn of the century, right in the height of the leaky building period when untreated timber was allowed to be used in wall framing.
It's understood the mould is not currently exposed to patients, as it is inside of walls, but breaches of the walls could be an emergency situation.
The DHB also says it may be cheaper to build new facilities rather than doing the repairs.
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