More recently, in many developed cities, there has been a shift away from the common inward-looking and enclosed shopping centre towards designs that lead to the emergence of new kind of spaces, where the public space of the city and the private space of the shopping centre meet and overlap - what will be termed ‘interface spaces’ in this paper. Through the rapidly growing opening up trend of shopping centres, especially in the Sydney metropolitan area, what is revealed is the ambiguity of these interface spaces. Although shopping centres have been criticised for their negative consequences attributed to privatisation of urban public space, interface spaces are undefined in what has been recognised as private and what has been known as public. Indeed, rather than negative development, the opening up of shopping centres to surrounding urban public space and emergence of interface spaces signify the provision of a balance between the public and the private realms – i.e. ‘publicization’ of private spaces rather than ‘privatization’ of public spaces. To clarify the concept of interface spaces in the contemporary urban context, this paper explores the theoretical analysis concerning provision and challenge of ‘publicness’ in relation to the emergence of interface spaces in the Australian urban context. Drawing on the notions of ‘bridge’ and ‘door’ in order to connect or separate, this paper proceeds to investigate the interconnectivity of interface spaces and urban public/private spaces to understand what role these new spaces can physically and experientially form in the urban future.