Santa Maria del Popolo
Soon after its transfer to the prestigious Lombard Congregation Santa Maria del Popolo was reconstructed between 1472 and 1477 on the orders of Pope Sixtus IV. This was part of the ambitious urban renovation program of the pope who presented himself as "Urbis Restaurator" of Rome. The medieval church was entirely demolished and a new three-aisled, Latin cross shaped basilica was built with four identical chapels on both sides, an octagonal dome above the crossing and a tall Lombard style bell-tower at the end of the right transept. The result of this reconstruction was an early and excellent example of Italian Renaissance architecture in Rome. In spite of the many later changes the basilica essentially kept its Sistine form until today.
Apostolic Palace
Upon returning to Rome in 1377 after the interlude of the Avignon Papacy, which saw Rome subject to civil unrest and the abandonment of several Christian monuments, the popes chose to reside first at Basilica di Santa Maria in Trastevere and then at Basilica di Santa Maria Maggiore. The Vatican Palace had fallen into disrepair from lack of upkeep and the Lateran Palace underwent two destructive fires, in 1307 and 1361, which did irreparable harm. In 1447, Pope Nicholas V razed the ancient fortified palace of Eugene III to erect a new building, the current Apostolic Palace.