Act leader David Seymour wants land at the foothills of Auckland's Waitakere ranges to be opened up for housing development.
Seymour this morning launched his new book, Own Your Future, at a property on Forest Hill Rd in Henderson, which lies just outside the urban boundary.
The owners, the Vitasovich family, want to subdivide the land, and their story features in Seymour's book as an example of the "red tape" he says Act will cut through.
Doing so would allow a minimum of 600,000 new homes to be built in areas like Waitakere, Karaka and Clevedon.
"By failing to open up this land for housing, successive governments are guilty of gross negligence," Seymour said.