This paper is the first to document empirically that urban shopping areas have a pronounced centre where the rents are the highest, and a negative rent gradient. We use this insight to build and test empirically a simple theoretical model of the competition between the residential and the retail land in a city. The model predicts that rents and occupancy rates on the edges of shopping areas are most sensitive to changes in economic conditions. Demand shocks may lead to transformations betweenretail and residential land use, mostly at the edge, and to a contraction or expansion of shopping areas. The model predictions are tested on unique data on the location and characteristics of all retail and non-retail properties within 300 largest shop...