Auckland's controversial Unitary Plan appears to be driving speculation on land in areas earmarked for multi-storey housing.
One West Auckland property sold this week having gained in value more than 51 per cent, or almost $300,000, in just over a year.
Property records show 43 Astley Ave in New Lynn sold in March 2012 for $545,000 to Anita Marie Kirker and Max Keith Tongue.
The three-bedroom, one-bathroom 180sq m home on a 1012sq m section sold again this week for $831,000.
Competition from five parties in the auction room drove the bidding up.