As the country's capital, it underwent intense expansion with the construction of buildings to house the newly established Ukrainian Soviet government and administration. Derzhprom was the second tallest building in Europe and the tallest in the Soviet Union at the time with a height of . In the 1920s, a wooden radio tower was built on top of the building. The Roentgen Institute was established in 1931. During the interwar period the city saw the spread of architectural constructivism. One of the best representatives of it was the already mentioned Derzhprom, the Building of the Red Army, the Ukrainian Polytechnic Institute of Distance Learning (UZPI), the City Council building, with its massive asymmetric tower, the central department store that was opened on the 15th Anniversary of the October Revolution. The same year on November 7, 1932 the building of Noblemen Assembly was transformed into the building of All-Ukrainian Central Executive Committee.