The large piazza delle Fontane Marose, formerly field for knightly tournaments, owes its name to an ancient source placed in its northwest corner, so called perhaps because of to its impetuosity, perhaps because of the proximity to the public brothel.

* Palazzo Spinola dei Marmi - it is a fifteenth-century palace in the Romanesque style  of Giacomo Spinola, called "dei Marmi", with the typical facade in white and gray stripes, the windows made of many openings and statues celebrating the family members: the building has been restructured several times, especially in the interior, keeping its medieval appearance.

* Palazzo Agostino Ayrolo (Negrone) - the seventeenth-century building is located on the upstream side of the square, with an eighteenth-century facade and twin marble portals dating back to 1870. The current appearance is the result of a reconstruction  of the late eighteenth century realised by incorporating a building constructed in 1560 - 1562 for Francesco De Ugarte, Ambassador of the Spanish Crown at the Republic of Genoa.

* Palazzo Paolo e Nicolò Interiano (Pallavicino) - the sixteenth-century palace is the only remaining of the time of Strada Nuova, althoug restructured, showing one of the most beautiful facades of the city painted with frescoes of allegorical figures of the seventeenth century. On the left side of the building there are three epigraphs of the Fathers of the City (1206, 1427, 1559) witnessing the fountains Amarose, Merose and Marose, which have been demolished with the creation of via G. Interiano.