 In 1894, the engineer and architect Cesare Nava built a vestibule in front of the church, consisting of three ionic arches in stone-like cement.In 1934 the houses that had sprung up in the courtyard were demolished, and in their place the following year was positioned a bronze statue of "Constantine the Great", a copy of an original late antiquity preserved in Rome in San Giovanni in Laterano; the courtyard was opened to form a public square.On the face of the women's gallery to the right of the apse is to be found the pipe organ, built by the Milanese organ builder Pietro Bernasconi, re-using materials from the organ constructed in 1840 by Felice Bossi; he in turn had re-used parts from an earlier organ, restored in 1820 by Antonio Brunelli II and probably originally from the church of San Giovanni in Conca.