Jabłonowski Palace (Polish: Pałac Jabłonowskich) is a historical palace at the Theatre Square in the Śródmieście district of Warsaw, Poland. Before World War II it served as the city hall of Warsaw.

It was constructed in 1773-1785 for Antoni Barnaba Jabłonowski by Jakub Fontana and Dominik Merlini. In 1817-1819 it was reconstructed for the purpose of becoming the city hall, taking the role of the dismounted Old City Hall. In 1863 the palace was damaged by the fire set up by demonstrating Polish patriots in the wake of January Uprising. In 1864-1869 it was reconstructed in the Neo-Renaissance style. The characteristic tower was added to the building at that time. During the Polish Defensive War of 1939 the city hall served as the headquarters of the civilian defense of Warsaw. During the Warsaw Uprising of 1944, the German forces destroyed the building. In 1952-1958 the debris from the city hall were removed.

In the 1990s the building was constructed again, according to the pre-1936 architectural plans. The shape of the palace, tower and facade are in the original pre-war state. Some parts were however built in the contemporary style.

Sapieha Palace (Polish: pałac Sapiehów w Warszawie) is one of the palaces in Warsaw New Town district of Warsaw, Poland. Started by the powerful Sapieha family who gave the name to the building, it currently houses the Environmental Protection School Complex.

The palace, commissioned by Jan Fryderyk Sapieha, Chancellor of the Grand Duchy of Lithuania, was built in Rococo style in 1731-1746 by Johann Sigmund Deybel. It was constructed as a French-style city palace, so-called Hôtel particulier. At that time it consisted of five-axial main building (corps de logis) and two outbuildings between the palace and a street. Between 1741-1742 the existing one-storeyed outbuilding was connceted with the main outbuilding of the palace complex, and between 1771-1790 another wing was erected to connect the inhabited corps de logis with the second outbuilding.

In 1818-1820 the palace was converted into the Sapieha Barracks (Koszary sapieżyńskie) for the use of the army. The Neo-Classical remodelling in the early 19th century was the work of Wilhelm Henryk Minter. During the November Uprising of 1830 - 1831 it served as the barracks for the famous Polish 4th Infantry Regiment (Czwartacy). Destroyed in 1944 by German occupying forces, it was rebuilt in the 1950s by Maria Zachwatowiczowa.

Mostowski Palace (Polish: Pałac Mostowskich) is an 18th-century palace in Warsaw, Poland, located at ul. Nowolipie 2 (2 Nowolipie Street) — prior to World War II, at ul. Przejazd 15.

The palace had been built in 1762-65 in the Baroque style for the Wojewoda of Mińsk, Jan August Hylzen. In 1795 it became, by inheritance, the property of Tadeusz Mostowski, Duchy of Warsaw minister of internal affairs. The palace was purchased by the government and rebuilt in 1823-24 in the classicist style according to a design by Antonio Corazzi. The building became the seat of the Congress Poland's Commission of Internal Affairs and Police, and a venue of concerts by Fryderyk Chopin.

In 1831 the palace was taken over for the needs of the Russian Army. Renovated in 1920, it became the seat of various municipal offices. During World War II, in 1944, it was destroyed by the Germans, except for the facade. After the war, in 1949, the Mostowski Palace was rebuilt. It is now the seat of Warsaw's police headquarters.

The Myślewicki Palace (Polish: Pałac Myślewicki) is a rococo-neoclassical palace in Warsaw's Royal Baths Park. It was created for king Stanisław August Poniatowski as one of the first buildings in the Royal Baths. Its name derives from the nearby not-existing village Myślewice. Initially, the palace was inhabited by the king's courtiers and later by Józef Antoni Poniatowski, the king's nephew. The cartouche above the main entrance was decorated with his initials JP. In the 19th century and during the People's Republic of Poland the palace served as a guest house and opened its doors to eminent guests such as Napoleon I and U.S. President Richard Nixon. On September 15, 1958 the first meeting of the ambassadors of the People's Republic of China and the United States took place in the palace, which is considered as the first attempt to establish contacts between the two countries.

The facade is adorned with a huge shell-bowl with sculptures by Jakub Monaldi depicting Zephyr and Flora, while the mild warping of the roof refer to the popular Chinese designs. Large parts of the original interior furnishings fortunately survived the last world war - paintings by Jan Bogumił Plersch from 1778 and Antoni Gerżabka as well as stucco decorations and sculptures. Particularly valuable are the Dining Room with views of Rome and Venice and the Bathroom with a plafond by Plersch depicting Zephyr and Flora.

Staszic Palace is an edifice at ulica Nowy Świat 72, Warsaw, Poland. It is the seat of the Polish Academy of Sciences.

The history of the Staszic Palace dates to 1620, when King Zygmunt III Vasa ordered the construction of a small Eastern Orthodox chapel, as a proper place of burial for the former Tsar Vasili IV of Russia and his brother, Dmitry Shuisky, who had died in Polish custody after having been captured several years earlier during the Polish-Muscovite War of 1605-18. As the population was mostly Catholic, Protestant or Jewish, there was little need for an Orthodox chapel, and in 1668 another Polish king, Jan Kazimierz Waza, transferred the chapel to the Dominican Order, who would be caretakers of the building until 1808.

In 1818 the building was purchased by Stanisław Staszic, a leader of the Polish Enlightenment, who ordered its renovation. The architect in charge was Antonio Corazzi, who designed the palace in a neoclassical style. After the renovation (1820-23), Staszic transferred the building to the Society of Friends of Science, the first Polish scientific organization. On 11 May 1830 a landmark was added to the palace, as Julian Ursyn Niemcewicz unveiled before it a monument to Nicolaus Copernicus sculpted by Bertel Thorvaldsen. After the November 1830 Uprising, the Society was delegalized by the Russian government, which had controlled Warsaw for most of the time since the final partitions of Poland in 1795. For the next 26 years, the palace was used by the directory of a lottery. In 1857-62 the palace was home to a Medical-Surgical Academy, the first institution of higher learning re-established in the Russian partition (all institutions of higher learning having been banned following the 1830 Uprising); but the Academy was soon closed after yet another failed insurrection, the January 1863 Uprising. Until the end of World War I, the building housed a gymnasium. From 1890 it was also home to an Orthodox church. In 1892-93 the palace was renovated by the Russian authorities; in line with the ongoing Russification of Warsaw, architect Mikhail Pokrovsky transformed the palace into a Russo-Byzantine-style building.

After Poland regained independence in 1918, in 1924–26 the palace was restored to its previous neoclassical style by architect Marian Lalewicz. In the Interbellum it hosted several scientific and scholarly organizations: the Warsaw Scientific Society, the Mianowski Fund, the National Meteorological Institute, the French Institute, and the Archeological Museum of Warsaw.

The palace was damaged during the 1939 siege of Warsaw and nearly razed during the 1944 Warsaw Uprising. In 1946-50 it was rebuilt in its original neoclassical form. Today it is the seat of the Polish Academy of Sciences.