Downtown - city's core or central business district (CBD) in North America

"Downtown is a term primarily used in North America by English-speakers to refer to a city's commercial, cultural and often the historical, political and geographic heart, and is often synonymous with its central business district (CBD). It is marked by a cluster of tall buildings, cultural institutions and the convergence of rail transit and bus lines. In British English, the term "city centre" is most often used instead. The two terms are used interchangeably in Canada. - Wikipedia"