If Wilhelm Greil was the mayor of the extension, the Viennese-born Eduard Klingler (1861 - 1916) could be described as its architect. Klingler had a significant influence on the cityscape of Innsbruck. He began working for the state of Tyrol in 1883. In 1889 he joined the municipal building authority, becoming its head in 1902. During this period of economic boom, the city began to expand. The two previously independent neighbouring communities of Pradl and Wilten were incorporated in 1904, which contributed massively to its growth. From 1880 to 1900, Innsbruck's population "only" grew from 20,000 to 26,000 inhabitants, while Wilten tripled from 4,000 to 12,000. 

The rapid increase in population presented the city administration with major challenges. In addition to the quantitative growth caused by the expansion of the city, Innsbruck also "grew" qualitatively in terms of people's quality of life. The city pushed ahead with building activity. Gas, water and electricity began to become standard. Schools and kindergartens had to be built for the new residents. The demands on medicine and thus the clinic grew. In Innsbruck, the commercial academy, the Leitgebschule, the Pradl cemetery, the dermatological clinic on the hospital grounds, the municipal kindergarten in Michael-Gaismair-Straße, the Trainkaserne (note: today a residential building) and the Tyrolean State Conservatory are on Klingler's account as head of the municipal building department. The Ulrichhaus on Mount Isel, which today houses the Alt-Kaiserjäger-Club, is a building in the local style that is well worth seeing.

The first free elections to the Imperial Council for all male citizens in 1907 changed the social rules of the game. The housing that was built in the working-class neighbourhoods was a reflection of a new society. Workers and employees with political voting rights had different needs than subjects without this right. Unlike in rural Tyrol, where farming families and their servants lived in farmhouses as a clan, life in the city came close to the family life we know today. The lifestyle of city dwellers demanded multi-room flats.

However, the social divide manifested itself not only in the functionality of the flats, but also in the architecture. In keeping with the spirit of the time, the projects were designed in the styles of historicism, classicism and Heimatstil. Until the outbreak of the First World War, clear forms, masks, statues and columns were style-defining elements in the design of new buildings. The ideas that architects had of classical Greece and ancient Rome were realised in a sometimes wild mix. Not only public buildings, but also large apartment blocks and even entire streets such as Sonnenburgstraße, Grillparzerstraße, Stafflerstraße, Kaiser-Josef-Straße and Claudiastraße reflect the style of the time.