The laying out of avenues was a general feature of the urban development of Italian cities in the 18th and 19th centuries, turning existing or newly created streets into popular summer promenades.
In 17th-to-early-19th-century Milan, promenaders used to asolare (‘take the air’) during the hot months along Via Marina, an unpaved avenue that underwent a thorough redevelopment in the 1780s when, to the east of the garden of the late-18th-century Villa Reale, two monasteries were suppressed during Austrian rule and their terrain turned into the city’s public garden by the architect Piermarini. Thus, by spring 1787, the street was lined by two series of five rows of trees—lindens, elms, and horse chestnuts—and flanked by white hawthorn hedges. With this new green aspect, called boschetti (little woods), Via Marina continued to be the corso for the bourgeoise on foot and the nobility in carriages, as it had been in the previous century.
A further two key 19th-century Milanese promenades took place along wide avenues: Corso Loreto (currently Corso Buenos Aires), which was in the middle of two other streets lined with poplar trees, and ‘very frequented by the common folk’; and a stretch of Corso di Porta Romana outside the gate, ‘a beautiful avenue thickly planted with trees, and more than one mile in length without the gate’ that ‘serves, on Sundays, as a promenade for the “folks” living in that quarter of the town’.