[2] The roof terrace is open to the public, with a renowned restaurant and bar that showcases the Roman skyline, and frequent concerts, often featuring Italian opera.

[citation needed] The new project was to incorporate some existing buildings, including the former palace of the Pamphilj (whose decoration by Agostino Tassi was partially preserved) and the Palazzo Cibo.

Borromini's limited contributions included the stucco decoration of the salone (the main room) and design of the Gallery, located at first floor level between the rest of the palace and the church of St. Agnese next door.

The elaborate doorframes regularly spaced along the longer walls of the Gallery display a combination of motifs typically used by Borromini and by Cortona [3] The plan has three courtyards.

[citation needed] The new palazzo was also the home of Innocent's widowed sister-in-law Olimpia Maidalchini, who was his confidante and advisor and, more scurrilously, reputed to be his mistress.

The Palazzo Pamphilj in Piazza Navona: Constructing Identity In Early Modern Rome (Studies in Baroque Art), 2008, Harvey Miller.