"We're still working through the detail around the building, precinct and the whole area," Dakin said.
The contamination issue had not affected that planning.
"From our perspective, it doesn't make any difference. They've announced their preferred site and we're the preferred parties," Dakin said of Goodman and Fletcher.
Earlier this year, plans were announced for the huge new structure when the dairy giant issued a statement, from Chris Caldwell, managing director of people, culture and services.
"While there was still some work to do before the co-operative would sign a lease, the preferred site would enable all Fonterra's employees in the area to be based in one location, instead of several as they are now," Caldwell said.
"Being closer together will enable our people to work together more seamlessly. This will provide a real opportunity to enhance the way our people feel about coming to work every day."
Fonterra will not own or develop the building. It will be developed by the Goodman Group/Fletcher Building partnership and ultimately owned by the Goodman Group. Fonterra would take a long-term lease, Caldwell said.
The co-operative is in several buildings around Auckland's CBD but its main office is at 9 Princes St.