In 1766 it was owned by the Bishop of Przemyśl, Andrzej Młodziejowski, for whom the palace was extended by Jakub Fontana before 1771.

In the 1890s, the palace housed the Russian ambassador Osip Igelström who during the Kosciuszko Uprising was the target of attacks led by Jan Kiliński, and was destroyed.

[5] These pavilions, together with the outbuildings, formed a courtyard limited on the street side by iron rails.

[7] During the works on reconstruction, the idea of restoring the building to its 18th-century form was accepted, which was connected with rejection of the 19th-century changes given by Frederick Albert Lessel.

Since 2011 the renovated palace has been the seat of the Office for Democratic Institutions and Human Rights of the Organization for Security and Cooperation in Europe.