The Industrial Revolution remade city space, ... Although the first industries would establish themselves in locations outside cities, near natural energy sources, rivers, raw materials, and labour pools, they were transplants of techniques and crafts developed in cities. The new factories were soon brought into the city centre, along with the mass of wage labour that was required for their operation. The industrial city reflected the emergence of three new classes of urban population: firstly, of the proletariat working class, selling their labour as a commodity, and now packed into the centre of the city in slums and tenement blocks, situated next to the factories and industrial buildings at which they worked. This area came to be a familiar feature of capitalist cities: the central business district. Secondly, the industrial bourgeoisie, or middle class, emerged at this time as owners of the factories, and their residential neighbourhoods connected to the city centre by new technologies of transit. Finally, alongside these two classes came a growing number of urban poor, a homeless underclass