of large edifices in the city centre. During this time, the city saw the building of banks, large hotels, theatres, warehouses, and factories. Architects who designed some of the most notable buildings of the city, in the late 19th and early 20th century, include Vitaliano Poselli, Pietro Arrigoni, Xenophon Paionidis, Salvatore Poselli, Leonardo Gennari, Eli Modiano, Moshé Jacques, Joseph Pleyber, Frederic Charnot, Ernst Ziller, Max Rubens, Filimon Paionidis, Dimitris Andronikos, Levi Ernst, Angelos Siagas, Alexandros Tzonis and more, using mainly the styles of Eclecticism, Art Nouveau and Neobaroque. The city layout changed after 1870, when the seaside fortifications gave way to extensive piers, and many of the oldest walls of the city were demolished, including those surrounding the White Tower, which today stands as the main landmark of the city. As parts of the early Byzantine walls were demolished, this allowed the city to expand east and west along the coast. The expansion of Eleftherias Square towards the sea completed the new commercial hub of the city and at the time was considered one of the most vibrant squares of the city. As the city grew, workers moved to the western districts, because of their proximity to factories and industrial activities; while the middle and upper classes gradually moved from the city-centre to the eastern suburbs, leaving mainly businesses. In 1917, a devastating fire swept through the city and burned uncontrollably for 32 hours. It destroyed the city's historic centre and a large part of its architectural heritage, but paved the way for modern development featuring wider diagonal avenues and monumental squares. City centre After the Great Thessaloniki Fire of 1917, a team of architects and urban planners including Thomas Mawson and Ernest Hebrard, a French architect, chose the Byzantine era as the basis of their (re)building designs for Thessaloniki's city centre. The new city plan included axes, diagonal streets and monumental squares, with a street grid that would channel traffic smoothly. The plan of 1917 included provisions for future population expansions and a street and road network that would be, and still is sufficient today. It contained sites for public buildings and provided for the restoration of Byzantine churches and Ottoman mosques. Also called the historic centre, it is divided into several districts, including Dimokratias Square (Democracy Sq. known also as Vardaris) Ladadika (where many entertainment venues and tavernas are located), Kapani (where the city's central Modiano market is