[5] Between 1712 and 1721 it was reconstructed by Agostino Locci and Kacper Bażanka (alcoves and breaks were added) for the next owner, Great Crown Hetman Adam Mikołaj Sieniawski.

It was the residence of Stanisław Małachowski, Marshal of the Sejm, who in 1791 co-authored the world's second, and Europe's first, codified written national constitution—the Constitution of May 3, 1791.

[5] Another famous resident of the palace (1808–26) was Zygmunt Vogel, an artist who specialized in watercolor and drawing and was a professor in the University of Warsaw Department of Fine Arts.

[5] From 1909 to the outbreak of World War II, the building belonged to Edward Raczyński, future President (1979–86) of the Republic of Poland in Exile.

In the courtyard before the Palace stands a copy of Andrea del Verrocchio's equestrian statue of the Venetian condottiere Bartolomeo Colleoni.

[2] In the south annex to the Palace, facing directly onto Krakowskie Przedmieście, a large second-floor room, the Chopin Family Parlor (Salonik Chopinów), features period furniture and memorabilia of the composer.