Palácio Guanabara, Rio de Janeiro

The Guanabara Palace is situated on Pinheiro Machado Street, formerly known as Guanabara Street, in the Laranjeiras neighborhood of Rio de Janeiro. It serves as the official headquarters of the State of Rio de Janeiro's government.

Originally built in 1853 with Neoclassical architectural features, this palace was initially a private residence until the 1860s. The Brazilian imperial family acquired it in 1864, and it was renovated by architect José Maria Jacinto Rebelo, becoming the residence of Princess Isabel and the Count of Eu, known as Paço Isabel. After the Republic's proclamation in 1889, it was taken over by the republican military government and renamed.

Over the years, the palace has been used as the official residence by several Brazilian presidents, including President Getúlio Vargas during the Estado Novo era (1937–1945). In 1938, it came under attack by members of the Brazilian Integralist Action, but they were repelled by the Special Police, a division of the Civil Police of the Federal District, with later reinforcement from the Army.

In 1894, the military forces confiscated the palace and incorporated it into the assets of the Union. The following year, Princess Isabel and her husband initiated a legal dispute to regain possession of the palace. During the legal process, Princess Isabel's successors sought the return of the Guanabara Palace and claimed ownership of the property to have it considered as part of the Royal Family's estate. However, the court ultimately ruled that the Guanabara Palace belonged to the Union and not the imperial family.