Barbecues will soon be installed on the view deck on the top of the building and up to 500 people will work on each floor, which Shortt said was a radical break from the traditional silo-style towers.
Shortt said Jon Raby, ASB's chief financial officer, told him: "People don't like it. They love it".
Just on 1180 staff have now left ASB Tower on Albert St, where floors are being decommissioned for occupation by new owner Auckland Council.
ASB is expecting huge energy cost savings in what will be its eighth headquarters since it was founded 166 years ago.
"It will be about 50 per cent but that will take us two years. We have 20 per cent now but over the next two years we'll know," Shortt said.
As for criticism of the building's appearance, Shortt is philosophical: "It's like art. This is 3D art. People either love or hate it, so you have to accept that some people hate it. You shouldn't get upset about that because it's like all architecture - it's in the eyes of the beholder."
Derek Shortt/BVN
Also designed and developed:
*C:Drive, the ASB building, Albany, owned by DNZ.
*Sovereign House, Takapuna, owned by Smales Farm.
*ASB North Wharf, Wynyard Quarter, owned by Kiwi Income Property Trust.