Properties of the Holy See, as agreed in the 1929 Lateran Treaty.
- property of the Holy See outside Vatican City but in the City of Rome
- Basilica of St. John Lateran (Basilica di San Giovanni in Laterano)
- Basilica of St. Mary Major (Basilica di Santa Maria Maggiore)
- Basilica of St. Paul outside the Walls (Basilica di San Paolo fuori le Mura), including the monastery
- Palace of St Callixtus (San Callisto)
- Sal Gianicola including that belonging to the Sacred College of Propaganda Fide.
- Palace of the Holy (Roman) 12 Apostles attached to the Basilica of the Holy Apostles.
- Palace attached to the Church of San Carlo Catinari
- Palace of the Datari near the Quirinal Palace.
- Palazzo della Cancelleria between the Corso Vittorio Emanuel and Campo de' Fiori.
- Palace of the Propaganda Fide on the Spanish Steps.
- Palace of the Holy Office (Sant'Offizio) adjacent to the Piazza San Pietro at Porto Cavalleggeri.
- Palace of the Congregation of the Oriental Church, formerly Palace of the Convertendi in Piazza San Cossacavalli.
- Palace of the Vicariato in Via della Pigna off the Corso Vittorio Emanuele near the Piazza Del Gesù
- Gregorian University in Via del Seminario near the Church of Sant'Ignazio.
- Gregorian University alla Pilotta facing on Piazza Di Pilotta.
- Biblical Institute on Piazza della Pilotta.
- Archaeological Institute, Oriental Institute, Lombard College & the Russian College on Piazza Santa Maria Maggiore.
- The two Palaces of Sant'Apollinare between the Piazza Sant'Apollinare & Via della Serola.
- The House of Retreat for the Clergy of Saints John & Paul, including the Nympheum of Nero, on the Caelan Hill.
- properties of the Holy See outside Rome are
- Pontifical Palace & Villa Barberini in the town of Castel Gandolfo.
- The following properties were ceded to the Holy See:
- The Basilica of the Holy House (Santa Casa) at Loreto, Province of Ancona.
- The Basilica of St Francis at Assisi, Province of Perugia.
- The Basilica of St Anthony at Padua, Province of Padua.