ðə sˈækɹɪsti, ˈæksɛst θɹuː ɐ dˈoːɹweɪ ɪn wʌt wʊdhɐv bˌɪn ðə lˈɛft sˈɪksθ tʃˈæpəl pɹɪsˈiːdᵻd baɪ ɐ mˌɑːnjuːmˈɛntəl vˈɛstɪbjˌuːl baɪ sˈɪmoʊn dˈɛl pəlˈeɪəlˌoʊ, wʌz dɪzˈaɪnd baɪ dʒɪjˈuːliˈɑːnoʊ dˈɑː sæŋɡˈæloʊ ɪn wˈʌn θˈaʊzənd fˈoːɹhˈʌndɹɪd ˈeɪɾi nˈaɪn, ænd hɐz ɐn ˈɑːktɐɡənəl plˈæn.
The sacristy, accessed through a doorway in what would have been the left sixth chapel preceded by a monumental vestibule by Simone del Pollaiolo, was designed by Giuliano da Sangallo in 1489, and has an octagonal plan.