He was among the first to purchase a large area for the construction of the family palace overlooking the Strada Nuova designed a few years earlier by Cantoni, with a garden, which disappeared during the 18th-century extensions, opening onto the Piazza del Ferro behind it.

The building did not undergo any major alterations until the beginning of the 18th century, when it passed into the ownership of the Carrega family and was raised by one storey and considerably enlarged: two perpendicular arms and the rear body were built, delimited towards Piazza del Ferro by a simple facade with plasterwork.

[3] Two rooms in particular belong to the eighteenth century phase, the chapel and the gilded gallery, masterpieces of the late Genoese Baroque due to Lorenzo De Ferrari, whose last works were completed shortly before his death in 1744.

The chapel is a small enclosed room, intended to highlight the famous statue of the Virgin and Child (known as the Madonna Carrega), sculpted by Pierre Puget around 1680,[4] which is currently on display at the Museo di Sant'Agostino and was replaced by a copy in 2004.

The complex decorative machine of the Galleria Dorata realised by De Ferrari probably in collaboration with Diego Francesco Carlone, represents one of the highest achievements of the late Genoese Baroque.