It brought into service on May 1, 1907. This building, strongly inspired on that of Dantzig, is attached to Jugendstil. It is in 1904 that a drilling of engineer Vogt, intended to seek coal or oil, makes discover, by six hundred meters of depth, a significant layer of potash extending to north and the west from Mulhouse. The Germans, then holding the world monopoly of potash with the rich person layers of Hannovre and Thuringue, are not very interested by this discovery but develop the extractions however. The first puit is drilled in 1908 and the exploitation starts in 1910. The opening of this layer also contributes to a notable increase in traffic on the axis Strasbourg-Basle, which already arrived at saturation.