In this century, we are witnessing a great effort of all nobility to join in the rediscovery of the state to ensure the security of an increasingly helpless community in the scene of the clash between Spain and France.
Just in the interests of defending its autonomy, even in the event of a permanent break with the Spanish ally, and thanks to the public financial commitment to the private one of noble and subordinate classes, new walls are built (1626).
Another great public work carried out to solve once and for all the problem of defending the port by freezing storms is the New Pier, although port traffic is now down sharply.
From the point of view of the town planning organization, after the construction of Via Balbi (1602-1613), the city seems to have reached a certain degree of stability, which is evidenced by the technical relief of the late-city city wanted by the Fathers of the Commune in 1656 .
In the second half of the century, however, we are faced with a new phenomenon of low-population demographic growth, linked, for example, to immigration from the surrounding mountains.
This fact provokes a new wave of private initiatives that alter the original layout of the building, which is increasingly layered vertically and horizontally, and the birth of mezzani houses, that is, to be rented on a flat basis.
In 1684 the naval bombardment of Louis XIV, which destroys entire areas from Banchi to Castello and the whole hill of S.Andrea, gives rise to more planned interventions (eg Ravecca area and the hill) but still fragmentary.
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