Tortona, Province of Alessandria
In the 20 years from 1951 to 1971 the population increased by approximately 30%. Subsequently it stabilizes to arrive, today, at a number that corresponds by default to the 1971 figure. This indicator is common to many small towns (but Pavia is not exempt from it either) that gravitate around the Po line.

In 1970 a new master plan for the city was drawn up. This plan, based on the statistics of the previous decade, envisages that by the end of the century Tortona could have a population of approximately 65,000 units, with the consequent need for housing.

Therefore, a series of new areas for expansion and completion are identified, as well as generously modified building permit indices right up to the areas bordering the centre, resulting in the urban form we recognize today.

Obviously, such an abundance of rooms will never correspond to a coherent number of inhabitants, and therefore, 50 years later, the deaths are counted, that is, the collapse of the real estate market is helplessly observed (evidently determined by an unequal balance between demand and supply) and the consequent ghettoisation of areas.