The annexe of the former palace of Maurycy Poznański and Sara Salomey née Silberstein was built in Łódź at 43 Gdańska St, designed by a well-known Łódź architect, Adolf Zeligson, a private friend of Maurycy. According to sources, the palace was almost finished in 1902. After Maurycy's death, his nephew, Maurycy Ignacy, moved into the palace. During the war, the building was taken over by the German occupiers, and after the war, by the communist authorities, who gave it to the professors of the University of Łodź. Since 1945 (actually since 1948, when adaptation works were completed) the building has been the seat of the Museum of Art (previously known as the Museum of History and Art). The buildings are entered in The Register of Monuments of the Łódź Voivodeship under number A/42 by decision of January 20, 1971.

Elements of the interior design have been preserved and exposed, historic window and door woodwork and ironwork, decorative grilles, metal lambrequins on the windows of the 1st floor, interior paneling, wall closet doors and other historical elements have undergone conservation. Based on restoration studies, the original colors of the facade, doors and windows were restored. In the former orangery (now the Directorate's office), original metal windows and doors were preserved and restored. Installations were modernized, and the building was brought into compliance with current fire protection regulations.
The interiors were intentionally furnished with modern furniture that does not refer to the historicizing style, which was intended as a form of dialogue between the Art Museum, which presents modern art, and the historic spirit of the place where it happened to have its headquarters.