Central business district
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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 "
The CBD is often also the "city centre" or "downtown", but this is also often not the case.
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.  No two CBDs look alike in terms of their spatial shape, however certain geometric patterns in these areas are recurring throughout many cities due to the nature of centralized commercial and industrial activities. 
Due to Berlin's history of division during the