At the turn of the century the production of optical devices expanded so much that it originated the first skyscrapers in the city of Wetzlar. The oldest part of this row of tall buildings is now hidden by a new building at the Schützenstraße. The first plans of the architect Jean Schmidt in 1907 show a brick building on a stone base, which was covered by a sloping roof and a slate roof. However, in the same year, it was decided to use the new construction of concrete skeletons and a simpler façade design. The four-story building is divided into six groups of windows, each of which has three windows. Narrow wall patterns and lightly embedded parapets summarize the three lowest floors. The fourth floor is visually separated from the lower part of the building by a very distant cornice. On either side of the central building there was a hip roof with high ceilings. The mansard's floor expanded as production and workers also increased. Only a few years later, Leitz again demanded the construction of a tall building. After the planning of Jean Schmidt, contractor Robert Schneider built a four-story building in 1911.