In this paper we will demonstrate that the architectural and urban heritage of a historical coastal city must play a decisive role in the sustainable development strategy, otherwise, this heritage can be degraded and even destroyed. We start by identifying the heritage resources in order to spot the problems which are facing it. It helps us recognize the vocation of the city and the solutions found by our ancestors to adapt to their environment, in order to use them as a model for future sustainable development of the city. It is within this context that we will formulate our recommendations for implementing such a project.