Complete and unique witness in Morocco to the advent of this new style, Mazagan is better preserved than other Portuguese fortifications in Morocco; most of the other Portuguese trading posts in the world having suffered many changes. Criterion (iv): The fortified Portuguese city of Mazagan is an outstanding example and one of the first, representing the new design concepts of the Renaissance period integrated with Portuguese construction techniques. The Portuguese fortifications of Mazagan, built in two phases (1510-1514 and 1541-1548), are impressive by their monumentality and their styles. The urban zone surrounding the old city of Mazagan must be closely monitored in order to check any change or new construction. Maintenance of the visual integrity as regards the urban zone of El Jadida and the harmonious relation between the Portuguese city and the modern town that surrounds it are a constant concern that requires control of the height of constructions both inside and outside the buffer zone.