One of the first, if not the first, apartment buildings in Athens was built in 1918–1919 by architect Alexandros Metaxas in an eclectic style for Petros Giannaros on Philellinon and Othonos Streets, adjacently to Syntagma Square.
The most important building of this style is the Bank of Greece on Panepistimiou Street built between 1933 and 1938 by a team of architects led by Nikolaos Zoumpoulidis, Kimon Laskaris, and Konstantinos Papadakis.
The designs of the new schools are based on Le Corbusier's principles, are completely unadorned with large horizontal windows, and are built with abundant and cheap materials such as stonemasonry and reinforced concrete.
Many neighbourhoods of Athens saw a construction spree fuelled by a more powerful middle and upper-middle class that were friendly to modernism and wanted to invest in property, as well as by the increase of population.
Influenced by Le Corbusier, Walter Gropius, and Erich Mendelsohn,[18] as well as more conservative architects such as Michel Roux-Spitz,[19] virtually every apartment building that was built in Athens during that decade followed this style.
An example of an apartment building with completely unadorned façades and many bay windows is the famous Ble Polykatoikia near Exarcheia Square designed in 1932 by Kyriakos Panagiotakos.
[26] For example, the Municipal Market of Kypseli, which was inaugurated in 1937 by the dictator and was designed by architect Alexandros Metaxas (the two are unrelated), includes a classical cornice and small ionic capitals, despite the fact that it is a special-purpose building.
Architect and professor at the NTUA Kostas Kitsikis had lobbied extensively for this change because he thought that builders and owners abused long bay windows in order to build as much surface area as they could, turning Athens into "a bad copy of German and Dutch cities.
However, in contrast with pre-war simplified classicism, the façades of the newer buildings often included a grid which was formed by balconies and thin vertical columns.
Many apartment buildings that were built during that era in Kolonaki and other central upscale neighbourhoods of Athens were designed by architects preferred by the upper-middle class such as Emmanouil Vourekas and Konstantinos Kapsampelis.
The building is completely undecorated with a subtly visible concrete frame in the form of a grid, and has many Corbusian principles such as the ground floor pilotis.
Valentis had a consistent ideology behind the design principles of office buildings concerning practicality and aesthetics which he later in 1960 wrote down in Architektoniki [Architecture] review.
[32] Some years later, two young architects, Nikos Valsamakis (born in 1924) and Takis Zenetos (1926–1977) also exerted much influence in revitalizing Greek modernism.
Moreover, its design is inspired by traditional architecture only in matters of materials, such as the stonemasonry of the ground floor and wooden elements elsewhere, and colouring, such as the contrast between white and bright red.
Gradually, apart from Le Corbusier's principles such as pilotis and horizontal windows, also post-war International Style came to influence most buildings in Athens.
In 1961, Kostas Kitsikis designed an office building for OTE on Tritis Septemvriou Street which includes a 58-metre tower with curtain walls and a lower wing with long brise soleil.