Boral developed two precinct plans. Holroyd City Council adopted the residential precinct plan in 2002. The then Minister for Urban Affairs & Planning took over planning powers for the employment area in November 2000 and approved the Employment Precinct Plan in June 2001, approving subdivision and associated works in the northern employment lands later in June 2001. Since, parts of the employment land have been sold and further subdivideed and sold. In 2000, the CSIRO site has an area of and is the primary research centre of the Division of Animal Production, with some 40 buildings and sheds having been constructed over the last forty years. As at 19 February 2001, The southern portion of Prospect Hill, located within the Boral Brickworks site has been extensively quarried; however the CSIRO site has largely retained its original surface form. Archaeological potential high within the CSIRO site. Long-term pastoral use on much of Prospect Hill has ensured the site retains its historical links and archaeological potential. However, Prospect Hill is under immediate threat from development, which has the potential to impact upon the significance of the site. This includes the rezoning of the site as part of SEPP 59 and development for residential/employment purposes, the continual quarrying of the southern portion of the hill; and new development proposals including a proposed flagpole to be erected on Prospect Hill commemorating Federation. Various modifications, extensions and refurbishment of buildings within CSIRO research complex over time. In 2002 Delfin Lend Lease entered a joint venture with Boral to develop the residential lands. This part of the estate is now known as Nelson's Ridge (after Nelson Lawson who owned the Greystanes Estate and commissioned Greystanes House in 1837). Nelson's Ridge is being developed by Lend Lease in two stages with the first comprising the northern employment and northern residential lands and the second comprising the southern equivalents. The former CSIRO site to the north of Nelson's Ridge was vacated in 1/2002 and sold to Stockland in March 2002. SEPP 59 also rezoned it for residential and employment uses. This site has its own precinct plan, now adopted into the Holroyd City Council's Development Control Plan: Part P Pemulwuy Residential Lands. It will eventually be integrated with the Nelson's Ridge development through Driftway Drive as well as cycleways and pedestian links being established between the two. The land inside the oval-shaped ridge was levelled from 2008 to 2010 and is rapidly filling with large industrial buildings. The gap in the ridge that had previously been created by quarrying has been lowered to the floor level of the quarry and the drainage of the area reversed from its earlier northward flow to empty into Prospect Creek, while a new road, Reconciliation Road, has been driven through the centre of the hill from Prospect Highway and across the gap to Wetherill Park.