The building has a centuries-long history of architectural stratifications and civil and religious functions: founded by the will of Guglielmo Peralta and his wife Eleonora of Aragon, daughter of the Marquis of Randazzo, the convent and the Church of the Carmine were integrated within the city walls in the 16th century, alongside the new churches of San Giacomo and San Paolino, contributing to the Renaissance urban plan of the old city.
Over the centuries, the façade underwent continuous transformations, incorporating portions of the ancient convent walls and adding Neoclassical and late Baroque elements, until it took on the form of the large ochre building in Piazza Garibaldi, in dialogue with the Cathedral and the Church of San Sebastiano.
Inside, the former cloister has been adapted into an honor courtyard, and the convent halls today host offices and council chambers, restoring to a place of seclusion the vitality of civic power, in a continuum between sacred and secular that narrates the political, religious, and social history of Caltanissetta.