The Property Council is disputing Auckland Council figures which suggest land is available to build 15,000 homes in the city.
Auckland Mayor Len Brown and the Government are arguing about the amount of land developers could immediately start work on.
The council says there is enough land in the city for developers to immediately begin building 15,000 houses.
New Zealand Property Council chief executive Connel Townsend told Radio New Zealand's Morning Report programme that Mr Brown is talking about land that is zoned and eligible.
He says the land is serviceable, but not serviced in terms of phone lines, water and other infrastructure to each plot.