The palace was built from 1557 to 1563 for Tommaso Marino. It was designed by architect Galeazzo Alessi from Perugia. Its main facade was originally that facing Piazza San Fedele, as Piazza della Scala didn't yet exist; the corresponding area was occupied by buildings. The construction was occasionally slowed down by the opposition of the population, that had a very conservative attitude towards the architecture of the centre of Milan. Several sculptors from the Fabbrica del Duomo were involved in the decorations of Palazzo Marino. In the courtyard, sculptures were erected representing the Labours of Hercules and the Metamorphoses. The ceiling of the main hall had frescos and stuccos with the Marriage of Cupid and Psyche by Andrea Semini and Ottavio Semini. The four corners of the ceiling were also decorated with paintings by Aurelio Busso representing the Four Seasons. Further frescos as well as bas reliefs decorated the walls, with mythological themes such as the Muses, Bacchus, Apollo and Mercury by Ottavio Semini. The reliefs depict the story of Perseus. When Marino died leaving his family bankrupt, the palace became a property of the State, but in 1632 it was sold to another banker, Carlo Omodei. The House of Omodei never inhabited the palace, which maintained its original name "Marino" and was rented to several notable Milanese. In 1781, the palace was once again bought by the State and became the seat of administrative and tax offices. The palace was then restored, with the supervision of architect Giuseppe Piermarini, who was responsible for the renovation of the entire area. , Palazzo Marino and the entrance of Galleria Vittorio Emanuele II In 1848, after the Five Days of Milan, the palace was temporarily used as the seat of the new government of Lombardy. It was finally elected as Milan's city hall on 19 September 1861. The acquisition of the palace by the city administration marked a new thorough restoration of the building and the surrounding area. The block that occupied what is now Piazza della Scala was demolished to create the plaza; the facade of Palazzo Marino facing the plaza was renewed to become the palace's main facade. A second major restoration, directed by Arrigo Buonomo, occurred after the end of World War II. The original stuccos and frescos in the Salone dell'Alessi were recreated ex novo by notable artists of the time.
