AUSTRALIA'S largest residential developer, Stockland, has won planning approval for housing estates in Perth and Sydney that will allow it to bring on more than 4000 new residential lots with an end value of around $1.5 billion. The group yesterday announced it would shortly begin selling lots at its 1800-home residential development in Perth's southwestern suburbs after receiving rezoning approval from the local council. Stockland's "Calleya" estate will be built in the semi-rural area of Banjup over 145ha of land previously used as a quarry. It is expected to have an end value of almost $600m. According to a statement to the Australian stock exchange, Stockland has already received more than 200 inquires from buyers interested in acquiring land at the site. Separately, Stockland is also expected shortly to push the button on a new estate in Marsden Park, in Sydney's northwest, that it is jointly developing with Winten Property Group. Stockland-Winten's Marsden Park development is in an area that was recently rezoned by the NSW government. Stockland is hoping to build 2300 homes on the 163ha of land it owns in the newly rezoned precinct. The Stockland-Winten development is part of a rezoning push in Marsden Park the government hopes will eventually see 10,300 new homes added to Sydney's tight residential market. The project has an end value estimated to be about $900m. Stockland purchased the plot from Winten early last year. In August, chief executive Mark Steinert said the group would increasingly be focusing on the rollout of new estates that had higher margins - including the Banjup and Marsden Park projects - after suffering lacklustre sales at its Victorian projects for more than a year.