A central business district (CBD) is the commercial and business centre of a city. It contains commercial space and offices, and in larger cities will often be described as a financial district. Geographically, it often coincides with the "city centre" or "downtown". However, these concepts are not necessarily synonymous: many cities have a central business district located away from its commercial and or cultural center and or downtown/city center, and there may be multiple CBDs within a single urban area. The CBD will often be characterized by a high degree of accessibility as well as a large variety and concentration of specialised goods and services compared to other parts of the city. For instance, Midtown Manhattan, New York City, is the largest central business district in the city and in the world. London's city center is usually regarded as encompassing the significantly smaller and historic City of London and the medieval City of Westminster, while the City of London and the transformed Docklands area containing Canary Wharf are regarded as their two respective CBDs. In Chicago, Illinois, the Chicago Loop is the second-largest central business district in the United States. It is also referred to as the core of the city's downtown. Mexico City also has its own historic city center, the colonial-era "Centro Histórico", along with two CBDs: the mid-late 20th century Paseo de la Reforma – Polanco, and the new Santa Fe, respectively. Moscow and Russia's largest central business district is the Moscow International Business Center.
The shape and type of a CBD almost always closely reflect the city's history. Cities with strong preservation laws and maximum building height restrictions to retain the character of the historic and cultural core will have a CBD quite a distance from the city center. This practice is quite common for European cities such as Paris, Moscow, Vienna, Prague or Budapest.
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New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is the most densely populated major city in the United States. The city is more than twice as populous as Los Angeles, the nation's second-largest city. New York City is situated at the southern tip of New York State. Situated on one of the world's largest natural harbors, New York City comprises five boroughs, each of which is coextensive with a respective county.
A metropolitan area or metro is a region consisting of a densely populated urban agglomeration and its surrounding territories sharing industries, commercial areas, transport network, infrastructures and housing. A metro area usually comprises multiple principal cities, jurisdictions and municipalities: neighborhoods, townships, boroughs, cities, towns, exurbs, suburbs, counties, districts, as well as even states and nations like the euro districts.
A megacity is a very large city, typically with a population of more than 10 million people. Precise definitions vary: the United Nations Department of Economic and Social Affairs in its 2018 "World Urbanization Prospects" report counted urban agglomerations having over 10 million inhabitants. A University of Bonn report held that they are "usually defined as metropolitan areas with a total population of 10 million or more people". Others list cities satisfying criteria of either 5 or 8 million and also having a population density of 2,000 per square kilometre.
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