From The New Yorker:
"How would one discover ownership of $1.2 billion and seventy-one institutions? Casey explained that the management of Vatican properties has been extremely fragmented. The Catholic church is estimated to own twenty per cent of all real estate in Italy, and a quarter of all real estate in Rome. The hills of Rome hold scores of curious religious institutions, monasteries, convents, seminaries, foundations, confraternities, institutes: hidden treasures with beautiful gardens, frescoed palaces, gurgling fountains, and breathtaking views, many of them family properties—each with its own complex history—donated by some rich Roman to the Church centuries ago."