Kopli was the most important industrial area in Tallinn, that achieved its final shape just before World War I. At the tip of the peninsula was the Russian-Baltic Shipyard (1912–1916) and the Bekker Plant (1912–1914) on the Kopli Bay. Between 1939 and 1941, architects Roman Koolmar and Karl Tarvas built 28 double houses in Kopli, Sirbi street, creating Kopliranna garden city between the Bekker industrial plant and cemetery. They followed the example of German social architecture and built type IV 1,5 storey twin houses. Type I and II have two apartments where the living room and kitchen are downstairs and the top floor has two bedrooms. Type III has larger rooms. Type II and IV have four apartments with a living room, bedroom and kitchen. However, the planned cross-street never got finished due to the outbreak of war. Buildings are traditional houses with their simple decor and gable roof. Common to the 1930s social architecture. Functionalism predominated in Estonia in the 1930s, and its best examples are located in Pärnu, thanks to the architect Olev Siinmaa. However, features of functionalism are also found in Karl Tarvas's work. In the middle of the 1930s, the areas of the Tallinn Houses were more criticized than before because they did not have the right garden cities and favored the spreading out of the city. From 1935, the development of Tallinn type houses continued, and since then Tarvas has designed Tallinn houses with functionalistic features: a smooth stone facade, a flat roof and wide windows. They were mainly three-storey houses with one stairwell. During the time of Konstantin Päts, a great deal of emphasis was placed on the representativeness of the buildings, based on more general architectural traditions. His main focus was in residential architecture, but he also designed community buildings, for example, Hans Kubu's private high school Imanta 6 (1927), Viinistu primary school (1928), Naissaare church (1933), and fire brigade building Jakobi 21 (1939). Tarvas, who worked as an architect in Harju County, designed elementary schools for Viimsi (1925–1927, the Museum of the Rannarahva) and for Viinistu (completed 1928), where he sought to create spaciousness with big windows and there were no excessive decor. He also made many smaller projects as a private architect.