"We're going building by building, piece by piece and we're spending a significant outlay. It's a major project," he said, refusing to discuss whether AMP had reached a settlement or been paid by any party involved in Botany's construction.
Many offices were built on the first level above the shops. "Water was coming in through the facades and some of the gutter systems," Mr Costley said. "Occasionally it would drip into the retail spaces. Parts of the centre are untreated timber."
The full scale of the issues was not revealed until the first refit of some shops, when decay was discovered.
Botany's issues follow a Herald report on Chancery, the Auckland CBD shopping/office precinct, that is also under cover as Arrow International does a $3.4 million repair job.
Chancery opened in 2000 and has many different owners, some of whom had been plagued by weather-tightness problems for many years. Repairs there were also coinciding with a facelift and a new colour scheme by architects Ignite.
In April, the Ministry of Education began multibillion-dollar legal action against major building product companies, including Australian giant James Hardie, over its huge repair bill for leaky school buildings.
The ministry was fighting more than 100 leaky-building court cases and remediation work was under way in more than 800 buildings at more than 300 schools nationwide.
James Hardie denied claims some of its products failed.