In 1900, on the territory belonging to the Treasury of the Russian Empire, the construction of a complex of barracks of the Cadet Corps named after Alexander Suvorov.
The building was designed by Wiktor Junosza-Piotrowski, and construction works were carried out under the supervision of Henryk Julian Gay.
[4] In 1914, after the outbreak of World War I, the building was rebuilt in the Neo-Renaissance style, designed by Stefan Shiller, for the purpose of a municipal hospital.
After negotiations with the hospital's Soldiers' Council, undertaken by officers of the Polish School of Infantry Cadets from Ostrów Mazowiecka, of the newly formed Polish Armed Forces the facility was taken over without a fight in exchange for facilitating the evacuation of sick and wounded German soldiers to their homeland.
The southern wing, from the side of the garden and Bagatela street occupied the collections of the Central Military Library and the resources of the Polish Museum in Rapperswil.
Since the building was intended as the seat of the State Council of the Polish People's Republic, the main hall, the staircase leading to the first floor and some rooms gained a representative character.
[4] The main portico was designed by Franciszek Krzywda-Polkowski, the interior by Jan Bogusławski, the sculptures by Stanisław Sikora, and the wrought iron and bronze details by Henryk Grunwald.
At the same time, in the period from 1959 to 1989, the southern wing was occupied by the Higher School of Social Sciences, operating at the Central Committee of the Polish United Workers' Party.
[4] In 2002, the law firm obtained permission to place the hallmark of the Hague Convention and a plaque informing about the historic nature of the buildings.
The most architecturally interesting rooms of the Chancellery include: Kościuszko, Column, Obrazowa, Tadeusz Mazowiecki (former Świetlikowa), Andrzej Frycz Modrzewski and a glazed hall in front of the former Prime Minister's office on the first floor, connected to the representative rooms: Round Table, Reception and Clock.