[1][2] The one-storey andesite (Ankara stone) building was designed by architect Salim Bey, at the request of Enver Pasha, as the headquarters of the Committee of Union and Progress.

Honourable members of the Assembly, it is well known that the Capitol of Caliphate and the Government has been occupied in temporary terms by the enemy forces and our independence has been restricted in every respect.

The committee room contains an exhibition of documents, photographs and artefacts relating to the Armistice of Mudros, Mustafa Kemal's arrival in Samsun, the Amasya Circular, the Sivas and Erzurum Congresses, and the Misak-ı Millî.

There is also an oil painting of Mustafa Kemal's arrival in Ankara, weapons and the telephone switchboard used during the Independence War and a silver cutlery set presented to Kâzım Karabekir at the Treaty of Alexandropol ceremony.

The legislative committee room contains displays of documents, photographs and artefacts relating to the Great Offensive, an oil painting depicting Mustafa Kemal on the balcony of the assembly building, Independence War medals and a rug symbolizing the National Pact.

The original appearance and arrangement of the assembly hall has been preserved with the following items: the president's and the chair council's pulpit in the middle surmounted by an Arabic script inscription reading, “Sovereignty belongs to the Nation”; benches from the Ankara Teachers’ Schools in the pulpit; side rows for the representatives; mezzanines on the right and left for the diplomatic corps and the audience, respectively, with space underneath for press and kerosene lamps and stoves from neighbouring coffee houses.