Ballarat is a primarily low-rise city. The City of Ballarat defines two Major Activity Centres within the urban area – the Central Business District (CBD) and Wendouree with a high concentration of business, retail and community function based primarily on the Melbourne 2030 planning model and a further 11 neighbourhood activity centres. The tallest building in urban Ballarat is the seven-storey Henry Bolte wing of the Ballarat Base Hospital (1994). Beyond the central area, urban Ballarat extends into several suburban areas with a mixture of housing styles. Predominant styles are 19th-century villas, Victorian terraces, Federation homes and Georgian red brick homes. Settlement patterns around Ballarat consist of small villages and country towns, some with less than a few thousand people.