Open AccessIn the 20th century city dwellers started facing various kinds of problems determined by the expansion of cities. Territorial growth caused serious environmental problems, intensive traffic and increased criminal behavior. For more than one hundred years cities have been seen as polluted, dangerous and even harmful for human health. Cities developed by different models of urban planning, which were influenced by architectural trends, economic situations, customs of the inhabitants. Technological revolutions, wars caused different changes of urban structures. In some cases some of the territories are not used anymore or used inefficiently. Damaged urban fiber has to be restored because usually it negatively affects the citizens living around it. Still, the city is quite a static and inert structure, urban transformations demand a lot of money, time and efforts .
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