Built between 1708 and 1713, two large lions watch over the entrance, near the columns that support the scenic balcony in local stone.

On the façade there is a sundial and an epigraph commemorating Garibaldi. The palace was built by Princess Antonia Spinola Colonna, wife of Marino III Caracciolo, when the family that dominated the city became convinced that the Castle, where she had resided for so long, was now reduced to such a state of disrepair that it was no longer suitable for residential function and much less suited to the position of the Caracciolos. An area outside the Largo was chosen for the new building. Thus it was that the center of gravity of Avellino moved from the medieval village, which had been the center of the city until then, to the new part, which began to develop precisely with the new building, completed between 1720 and 1730, under the supervision of the engineer Filippo Buonocore, one of the best in the kingdom. The palace had a magnificent garden, where in January 1735 Charles III of Bourbon was welcomed, passing through the city during his journey in the kingdom which he had recently taken possession of. Avellino became the capital of the Principality Ultra in 1806, two years later the Municipality bought the building to allocate the Courts and other public offices. In 1839 another floor was added by the provincial administration, of which it has been the headquarters since 1987, after the post-earthquake restoration.