English: The building, designed by architect Vedat Tek (1873-1942) and built as the Republican People's Party Headquarters in 1923, was later converted to function as the Assembly building. The two-storey building also has a basement floor. The centrally located two-storey high main assembly hall is surrounded by rooms on three sides. The main entrance hall, which stretches all along the entry facade, has two grand stairs at opposite ends and its ceiling is decorated with Seljuk and Ottoman ornaments and patterns. The main assembly hall, with audience boxes arranged in sections within, is also decorated in a similar style. Its star patterned timber ceiling, arcs, cornices and many sections with mosaic decorations, except the crown door and a few other items, which are included into the main hall afterwards, reflect the architectural characteristics of its time.

I. Turkish Grand National Assembly building, in spite of some alterations made later, was inadequate to satisfy the growing needs of the Assembly of the Turkish Republic. That is why the II. Turkish Grand National Assembly was built and opened on 18 October 1924.

II. Turkish Grand National Assembly is an important building in which Atatürk’s principals and reforms came to life, the most important decisions taken on the way to develop the new Republic by contemporary legislation, also where the international treaties and agreements made to increase Turkey's prestige and activities in the international arena and the transition to a multiple party system took place between 1924 - 1960. II. Turkish Grand National Assembly played an important role in Turkish political history for a period of 36 years until 27 May 1960. After moving the Assembly to its new modern building in 1961, the building was allotted to the Central Treaty Organization (CENTO). The building functioned as the headquarters of CENTO between the years 1961 and 1979 and after the abolishing of CENTO in the same year, it was transferred to the Ministry of Culture. The decision was made to arrange the front section of the building as the Museum of the Republic and the rear section as the administration building for the the General Directorate of Antiquities and Museums. The museum section, after refurbishment and restorations, opened to public exhibition on 30 October 1981 as “Museum of the Republic”. It functioned with this arrangement until 1985. This same year it was closed to public and new restoration work started. The work continued until 1991 and in January 1992 the museum reopened to public. The events comprising the era of the first three presidents of the Republic are presented by their own words, speeches, photos and personal items and also the decisions taken and the laws passed by the Grand Assembly during the same period are on display in this museum.