13 Solny Square, Wrocław, Historical tenement house at Solny Square, Wrocław, Poland.

13 Solny Square is a three-storey, four-axis building on Solny Square in Wrocław, rebuilt after 1826 in a classicist form with a flat mansard roof and a strongly projecting eaves. Its facade has an original grid-like division, and the left outer axis holds a portal with massive glazed oak doors leading to a hall that once opened into the bank's operating room. A three-sided bay window was added above the entrance around 1900.

The house was built in the mid-16th century; by 1710 it was a five-storey building with a Baroque four-axis facade and a two-storey edicule gable topped by a triangular tympanum. From 1789 to 1945 it housed the Eichborn & Co. bank, founded in 1728, and in 1795 it was joined to the building at ul. Karola Szajnochy 4. After 1826 it was demolished and replaced by a three-storey Neoclassical building with a flat mansard roof.

From 1789 to 1945 the building housed the Eichborn & Co. bank, founded in 1728 and described as Wrocław's second-oldest banking firm. The rebuilt entrance carries wrought-iron gates dated "1789" with the name "Eichborn & Co." and gilded oak acorns. In 1945–1957 the Ossolineum publishing house from Lwów worked in these walls.

The building stands at Plac Solny 13, on the western side of Wrocław's Market Square, and is linked to the building at ul. Karola Szajnochy 4, so it can be viewed from both streets. The ground floor of the Szajnochy side has large windows inserted in 1905. The square is paved and level, with tram stops a short walk away.

The wrought-iron door grille added around 1900 by Filippo Moriz Eichborn bears the date "1789" and the name "Eichborn & Co.", framed by oak branches with gilded acorns. The building housed the Eichborn & Co. bank from 1789 to 1945, and from 1945 to 1957 the Ossolineum publishing house from Lwów worked in its walls.