ɪn wˈʌn θˈaʊzənd fˈoːɹhˈʌndɹɪd ˈeɪɾi nˈaɪn, ɐ kˈɑːlʌmd vˈɛstɪbjˌuːl ænd ˈɑːktɐɡənəl sˈækɹɪsti, dɪzˈaɪnd baɪ sˈɪmoʊn dˈɛl pəlˈeɪəlˌoʊ, nˈoʊn æz ˈɪl kɹənˈɑːkə, ænd dʒɪjˈuːliˈɑːnoʊ dˈɑː sæŋɡˈæloʊ ɹᵻspˈɛktɪvli, wɜː bˈɪlt tə ðə lˈɛft ʌvðə bˈɪldɪŋ.
In 1489, a columned vestibule and octagonal sacristy, designed by Simone del Pollaiolo, known as Il Cronaca, and Giuliano da Sangallo respectively, were built to the left of the building.