Le Strade Nuove and the system of the Palazzi dei Rolli became a World Heritage Site in 2006.
The criteria for this selection were explained by the UNESCO as follows:
Criterion (ii): The ensemble of the Strade Nuove and the related palaces exhibit an important interchange of values on the development of architecture and town planning in the 16th and 17th centuries.
Through the architectural treatises of the time, these examples were publicized making the Strade Nuove and the late-Renaissance palaces of Genoa a significant landmark in the development of Mannerist and Baroque architecture in Europe.

Criterion (iv): The Strade Nuove in Genoa are an outstanding example of an urban ensemble consisting of aristocratic palaces of high architectural value, which illustrate the economy and politics of the mercantile city of Genoa at the height of its power in the 16th and 17th centuries.
The project proposed a new and innovative spirit that characterized the Siglo de los Genoveses (1563 to 1640).
In 1576, the Republic of Genoa established a legally based list of Rolli recognizing the most outstanding palaces for official lodging of distinguished guests.
Le Strade Nuove and the system of the Palazzi dei Rolli became a World Heritage Site in 2006. The criteria for this selection were explained by the UNESCO as follows:
Criterion (ii): The ensemble of the Strade Nuove and the related palaces exhibit an important interchange of values on the development of architecture and town planning in the 16th and 17th centuries. Through the architectural treatises of the time, these examples were publicized making the Strade Nuove and the late-Renaissance palaces of Genoa a significant landmark in the development of Mannerist and Baroque architecture in Europe.
Criterion (iv): The Strade Nuove in Genoa are an outstanding example of an urban ensemble consisting of aristocratic palaces of high architectural value, which illustrate the economy and politics of the mercantile city of Genoa at the height of its power in the 16th and 17th centuries. The project proposed a new and innovative spirit that characterized the Siglo de los Genoveses (1563 to 1640). In 1576, the Republic of Genoa established a legally based list of Rolli recognizing the most outstanding palaces for official lodging of distinguished guests.
Genoa: Le Strade Nuove and the system of the Palazzi dei Rolli