Palaces and the Pope: the fascinating story of how Renaissance Rome was rebuilt
by Alyssa Rusonik
Uncertainty over whether the seat of the papacy would remain in the city explains why Rome was a late developer when it came to palace-building, lagging behind Florence and Venice.
You can find two interesting books on this subject in the PG catalog:
https://www.gutenberg.org/ebooks/36817
https://www.gutenberg.org/ebooks/69619