The palace lies in piazza Garibaldi, the central square in the old town; it is surrounded by the pedestrian streets of the historical centre an all the other sides.
By looking at old maps, one can easily detect the existence of two ancient suspended pathways connecting the palace to two neighbouring buildings, home to the podestà and the governor; these were destroyed in 1850, when Palazzo Gallavresi was owned by the Bellinzaghis.
Above the porticoes dating back to the 15th century, the facade features marble medals with the faces of four Italian patriots: Giuseppe Mazzini, Giuseppe Garibaldi, Vittorio Emanuele II and Camillo Benso, conte di Cavour. The medals were made between 1884 and 1889.
Between the windows there used to lie the coat of arms of the town marquesses (from the earliest to the last, the Viscontis, the Sforzas, the Villanis and the Schizzis).
The main characteristic of the interior of the palace is a majestic stairway, featuring a starry sky on the ceiling, leading to the town council hall, in the upper floor. The hall is typically baroque, and is by far the most richly decorated in the building; it features a decorative bend on all four sides, just below the ceiling, with pictures of winged putti playing instruments. The walls feature baroque frescoes. The floor features a mosaic representing the coat of arms of the town. The entrance of the hall hosts a sculpture of Emilio Gallavresi, who was born and lived in the building and became a member of the Italian parliament as a member of the Italian Socialist Party; the sculpture was made by Enrico Pancera.