suburbs for home purchasers were more than west of the Sydney CBD, which included areas with high construction activity such as Baulkham Hills, Castle Hill, Liverpool and Blacktown, which has become Sydney's most popular area for home buyers, with more sales than any other suburb. This is mainly due to the immense cultural activities and high affordability in the region, and also the development of new restaurants, high-rise apartments, telecommunications, local employment, retail, ferry access and education. Regarding this, Allworth Homes director Stephen Thompson states, "While the outskirts of Sydney were once considered undesirable, improved infrastructure coupled with soaring house prices has meant many property seekers are looking further afield for their homes, including high-income earners". With Western Sydney Airport opening in the mid 2020s, Penrith is slated to become another CBD, with the airport creating 35,000 jobs by 2035. Agriculture Agriculture is mainly concentrated in the outskirts of the Greater Western Sydney area, such as in suburbs of Kemps Creek, Mount Vernon, Mulgoa, Bringelly, Silverdale, Orchard Hills, Luddenham and Horsley Park, among others, which lie in a countryside adjacent to the footsteps of the Blue Mountains westwards of these country plains. Abbotsbury, Cecil Hills and Glenmore Park were farms through until the 1980s when it was decided to redevelop them for housing. The area around the site of Regentville has remained largely rural, if hemmed in somewhat by the modern residential suburbs of Jamisontown and Glenmore Park. In the 1800s, John Blaxland built an original wooden weir at "Grove Farm" (now known as Wallacia) for a sandstone flour mill and additional brewery. The land was also used for wheat farming until 1861 when wheat rust infected the entire crop. The rural regions were chiefly one of dairying and grazing during the 19th century, but in the early 20th century – because of its rural atmosphere and proximity to Sydney – tourism developed as people opened their homes as guest houses. Today, the rural areas include a number of orchards and vineyards in the meadows. Vegetable farming and fruit picking are common activities. Transport The M4 Western Motorway is a prominent dual carriageway motorway in western Sydney, that stretches from in the east, where it connects with the Great Western Highway/Parramatta Road as the A4 to in west. It continues as the Great Western Highway as the A32, passing the southern fringe of the Parramatta central business district, moving due