An agricultural, forest or natural environment represents a setting that households may seek. By integrating this behaviour into an economic urban model, we generate periurban belts where farmers produce amenities that inhabitants consume. The resolution of this model gives predicted values of some variables that may be compared to the values observed in reality. Calibrating the model, that is to say minimizing the gap between predictions and observations, provides a value of unobservable variables, in particular the price of rural amenities.