The House on 56, Allée de la Robertsau is an Art Nouveau building in the Neustadt district of Strasbourg, France.

It is classified as a Monument historique by the French Ministry of Culture since 1975.

[1] The house was built from 1902 until 1903 by the architects Franz Lütke (1860–1929) and Heinrich Backes (1866–1931) for the master baker Georges Cromer.

[2] It is considered as one of the most representative buildings of the Strasbourg brand of Art Nouveau architecture, influenced both by German and by French stylistic tendencies.

A very prolific duo, they built a number of other Art Nouveau houses in Strasbourg, of which several are classified as Monuments historiques as well (such as 46, Avenue des Vosges; 22, Rue du Général de Castelnau; 4, Rue Erckmann-Chatrian; and 24, Rue Twinger).