Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
Central business district in state capital cities such as Melbourne, Brisbane, Perth, Adelaide and Sydney. Sydney is currently Australia's largest CBD with Melbourne second and Brisbane third when judged by number of total buildings. The iTowers of Masa Square CBD were built for doing business task only. It's within the city of Gaborone, Botswana. In China terms "city center" (Chinese: 市中心) are used but a different commercial district outside of the historic core typically called a "CBD" (中央商務區) or "Financial District" (金融貿易區) may exist. Large Chinese cities typically have multiple CBDs spread throughout the urban area. Cities traditionally being major cultural centers with