Alexander said the new park was a privately owned public open space, created next door to Butterfly Creek, and a mountain biking track has been created next door.
"No ratepayer or taxpayer money went into this," he said.
The airport company commissioned 10 sculptures, including one by Terry Stringer, for the park around a small lake.
The airport is calling the new area an art walk. More art installations are being placed in other airport areas such as the terminal entry roundabout and in the Landing precinct.
Alexander said the aim was to link parts of the airport. Although the park is about 1km from the international and domestic terminals, visitors still walked over there to relax.
"It's provided for people to use, including visitors to New Zealand and short-term visitors to the airport," Alexander said.
Alexander has been appointed chief executive of listed property specialist DNZ Property Fund where he starts work in December.