form NZBC TV. In 1975, the NZBC was broken up with Wellington and Dunedin studios taking over NZBC TV as Television One while Auckland and Christchurch studios launched Television Two. At the same time, the Wellington studios moved to the new purpose-built Avalon Television Centre in Lower Hutt. In 1980, Televisions One and Two merged under a single company, Television New Zealand (TVNZ). The majority of television production moved to Auckland over the 1980s, culminating in the opening of TVNZ's new Auckland television centre in 1989. Today, digital terrestrial television (Freeview) is available in the city, transmitting from Mount Kaukau plus three infill transmitters at Baxters Knob, Fitzherbert, and Haywards. Sister cities Wellington has sister city relationships with the following cities: Sydney, Australia (1983) Xiamen, China (1987) Sakai, Japan (1994) Beijing, China (2006) Canberra, Australia (2016) It also has historical ties with Chania, Greece; Harrogate, England; and Çanakkale, Turkey. Wellington metropolitan area The wider metropolitan area for Wellington encompasses areas administered by four local authorities: Wellington City itself, on the peninsula between Cook Strait and Wellington Harbour; Porirua City on Porirua Harbour to the north, notable for its large Māori and Pasifika communities; and Lower Hutt City and Upper Hutt City, largely suburban areas to the northeast, together known as the Hutt Valley. Depending on the source, the Wellington metro area may include Waikanae, Paraparaumu and Paekākāriki on the Kapiti Coast, and/or Featherston and Greytown in the Wairarapa. The urban areas of the four local authorities have a combined population of residents as of . The four cities comprising the Wellington metropolitan area have a total population of with the urban area containing % of that population. The remaining areas are largely mountainous and sparsely farmed or parkland and are outside the urban area boundary. More than most cities, life is dominated by its central business district (CBD). Approximately 62,000 people work in the CBD, only 4,000 fewer than work in Auckland's CBD, despite that city having four times the population. The Waikanae-Paraparaumu-Paekākāriki combined urban area in the Kapiti Coast district is sometimes included in the Wellington metro area due to its exurban nature and strong transport links with Wellington. If included as part of Wellington metro, Waikanae-Paraparaumu-Paekākāriki would add to the population (as of ). Featherston and Greytown in the Wairarapa are rarely considered part of the Wellington metropolitan area, being physically separated from the rest of the metropolitan