The evolution of block size and form in North American and Australian city centres

The paper describes a comparative study of block size and form in twelve North American and Australian city centres. The purpose of the study was to analyse the effect of different initial block sizes and forms on the nature of subsequent urban development, in terms of land parcelling, building forms, circulation patterns, and partly also of land use. The study considered the evolution of the block and layout pattern since the initial layout was established, and its present form and performance. The findings demonstrate that certain block forms and dimensions perform better than others, in particular aspects and circumstances, and that the choice of initial block forms and sizes leads to predictable consequences and processes in subsequent development. The method used offers a systematic basis for other comparative studies of the influence of differing block forms and sizes in both historical and contemporary urban fabrics.