Former McConnell Property chief executive Martin Udale says that to hit the 300,000 target, one in five of Auckland's 385,000 existing homes will have to be demolished to allow for medium- and high-density housing. This means a lot more apartment blocks, townhouses and intensified shopping, schooling and other infrastructure. It means the Auckland dream of a villa in a quiet suburb near to town, with a sea view and a backyard, is dead.
This Auckland Plan is at the centre of the recent clash between the Auckland Council and the Government. The Government is creating a panel to review objections to the plan, blocking attempts by the council to get it exempted from the Resource Management Act.
Finance Minister Bill English is rightly concerned about the ramp-up of house prices in Auckland beyond the reach of young families. English is right to target Auckland's chronic inability to quickly build new houses that don't dissolve in the rain.
Auckland's building consents have languished to about 4000 a year for the past four years, well down on the 2002-05 levels of about 12,000 a year, which is what's necessary to meet expected population growth.
Something's got to give. Either Auckland builds up its centre or it sprawls to Hamilton in a blanket of single-level dwellings.
The third option is the easiest for property owners, and the most likely - that's doing nothing and blocking development.
It has proved a profitable strategy for homeowners and land-bankers, given the median house price in Auckland has more than doubled to $515,000 in the past 10 years as the number of building consents has more than halved.
Nimby is the most profitable investment strategy in New Zealand.