In different countries, expressions of diversity to refer to the center of the city, goes to work, which almost mean the same. District commercial Central that refer to the Thirty, the CBD called another title to refer to the center of the city. In North America, the term downtown down town for this purpose can be used.

in Iran, the phrase downtown and against the English, namely the City centre, in signs, and driving on the streets and roads goes to work, but usually the center of the city lacks the range of a certain. Traditionally, center cities in Iran, including the market and the areas around it can be that core, and the primary city of the form. In principle, in the past cities for several networks have been in often this network, all streets towards the central part of the city, which was in the central part of the church or temples and also device government, and most offices important Urban was and people these days, from the suburbs to the center can at night to their homes open..
the center of the city of Tehran from the laws of traffic to certain peer-regulation plan and traffic regulation plan, the traffic and the odd.