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A central business district (CBD) is the commercial and business centre of a city. In larger cities, it is often synonymous with the city's "financial district". Geographically, it often coincides with the "city centre" or "downtown", but the two concepts are separate: many cities have a central ''business'' district located away from its commercial or cultural city centre or downtown. Both the CBD and the city centre or downtown may also coincide with the central activities district. A city's CBD is usually typified by a concentration of retail and office buildings.〔(Central Business District ) (from scalloway.org.uk website)〕 The CBD usually has an urban density higher than the surrounding districts of the city, and is often the location of the tallest buildings in the city. The CBD is often also the "city centre" or "downtown", but this is also often not the case. For example, London's "city centre" is usually regarded as encompassing the historic City of London and the medieval City of Westminster, whereas the City of London and the transformed Docklands area are regarded as its two CBDs. Mexico City also has a historic city centre, the colonial-era Centro Histórico, along with two CBDs: the mid-late 20th century Paseo de la Reforma - Polanco, and the new Santa Fe. In Taipei, Taiwan, the area around its main railway station is regarded as the historic city centre while the Xinyi Planned Area located to the east of the said railway station is the current CBD of Taipei, being both the financial district and the premier shopping area, and the location of Taipei 101, Taipei's tallest building. The shape and type of a CBD almost always closely reflect the city's history. Cities with maximum building height restrictions often have a separate historic section quite apart from the financial and administrative district. In cities that grew up relatively quickly and more recently, such as those in the western half of North America, a single central area or downtown will often contain all the tallest buildings and act both as the CBD and the commercial and cultural city centre. It has been said that downtowns (as understood in North America) are therefore conceptually distinct from both CBDs and city centres.〔"(Reviving American downtowns )". ''The Economist''. 1 March 2007.〕 CBDs usually have very small resident populations. For example, the population of the City of London declined from over 200,000 in the year 1700 to less than 10,000 today. In some instances, however (and particularly in large Australian and Canadian cities), CBD populations are increasing as younger professional and business workers move into city centre apartments (gentrification). ==Australia== The term is used to refer to the business and financial area of a state capital city such as the Sydney CBD, Melbourne CBD, Brisbane CBD, Perth CBD and Adelaide CBD. Historically, as in most Australian cities the CBD coincides with the city's historical and cultural centre, "CBD" was the preferred term for the city centre, to some extent used interchangeably with the term "City" or "city centre" when referring to such central areas. More recently, in many cities the "city centre", which may or may not be distinct from the CBD, is increasingly separately identified. Australia is one of the most urbanised countries in the world and these cities have a high-rise CBDs. Sydney Central Business District is one of the most well-known CBDs in Australia and forms an iconic image of Australia as it includes the Sydney Opera House and the Sydney Harbour Bridge. The CBD is the site of the largest concentration of companies in Australia. Melbourne CBD is the second-largest in Australia. It is the centre for everything in Victoria. It hosts the headquarters of several large Australian companies. Brisbane CBD is the largest CBD in Northern Australia and North-eastern Australia and Queensland. It hosts the headquarters of some of the largest companies in Northern Australia. Perth might be one of the most isolated cities in the world, but its CBD is the largest in Western Australia and one of the largest along the Indian Ocean. Adelaide City Centre is the largest CBD in South Australia and south-central Australia. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Central business district」の詳細全文を読む スポンサード リンク
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