"Within the context of the urban structure, the urban void is not considered as the opposite notion of the urban built , but rather as the "absence" of the urban built. Pursuing a more or less Derridean approach, the proposed paper discusses the urban void in accordance with the identification of the urban built. Introducing the word "differance", Derrida argues that "in a (traditional) binary opposition,that wich differs is not that wich is other, but that wich is the same word". As a consequent, in the (traditional) bipolarity of the urban built and void, the "differance" of the word void from the word built is not located outside of these words, but within the word built. Or vice versa , the " differance" of the word built from t void is not located outside of these words, but within the word void. Thus in order to explore the notion of the urban void in structural terms we have to explore the notion of the urban buil."