This research examines the transformations of the urban block from the Medieval times to today. Starting with the traditional form of the block in the Medieval European cities, we move to the Haussmanien block that corresponds to the dictations of the rising Bourgeoisie. Continuing we see the development of the English Garden cities and the beginning of the breaking of the block. While examining the plans for the extension of Amsterdam and the planning of Frankfurt we end up with the loss of the urban block by the formings of Le Corbusier. Later the forms of Le Corbusier’s and the School of Bauhaus will be reexamined by the architects of New-Rationalism, and the urban block comes back in architectural design. In modern time the applying of the qualities of the block is realized in the form of a New Urbanity. Through the transformations of the block we can observe some of the social conditions that mark each plan.