Smith told the committee it was "offensive" that an investor could buy a block of dirt for $890,000 in 1995 and put it on the market today for $112 million.
"The most important change that I want to see in the commercial behaviour of some of those landowners is recognising and then believing that both government and council are serious about changing the regulatory environment and that they cannot expect those super profits on into the future," Smith said. "We want to change their behaviour."
Over the past decade, the number of vacant sections in Auckland has plummeted to just 1,400 from 4,000 and at the same time prices have soared, he said.
Auckland house prices were approaching seven times the average income, compared with the ideal of not more than four times income, Smith said.
"This issue of land costs in Auckland is absolutely central to the issue of housing affordability" with land now accounting for about 60 per cent of the cost of a house in Auckland, Smith said.
A report released today showed Auckland posted a new record median house price of $565,000 in May. Auckland's median price recorded the largest regional increase of 13 per cent over May last year, according to Real Estate Institute figures.
The government's accord with Auckland council proposes the consent of 9,000 new homes in its first year, rising to 13,000 consents in year two and 17,000 consents the following year.