"The people living in China buy the places the Kiwis are trying to get, then those places are rented out the next day," the insider said, fearing for the job they perform but revealing their full identity to the NZ Herald.
That showed the person is in an important position in the property sector, with extensive access to information unavailable to the public revealing who the buyers really are.
"We're becoming tenants in our own country. It's utterly outrageous."
In some cases, a single Chinese resident was spending up to $15 million on Auckland properties and the higher the bidding at auctions went, the happier they were.
Peter Thompson, Barfoot & Thompson chief, acknowledged there were many Chinese buyers in Auckland but has disagreed with Labour's analysis.
"We know there's been a large portion of Asians buying property but there's no way to tell if they're one of three categories: NZ born, foreign-born NZ citizens or foreign-born foreign citizens. If you asked me about Asian non-residents, I'd probably say between 5 and 8 per cent," Mr Thompson said.NZME