The centre and the focus of the building is the Central Hall. It consists of chambers of the Lok Sabha, the Rajya Sabha, and the Library Hall and between them lie garden courts. Surrounding these three chambers is the four-storeyed circular structure providing accommodations for ministers, chairmen, parliamentary committees, party offices, important offices of Lok Sabha and Rajya Sabha Secretariat, and also the offices of the Ministry of Parliamentary Affairs. The Central Hall is circular in shape and the dome is 30 metres (98 ft) in diameter. It is a place of historical importance. The Indian Constitution was framed in the Central Hall. The Central Hall was originally used in the library of the erstwhile Central Legislative Assembly and the Council of States. In 1946, it was converted and refurbished into Constituent Assembly Hall. At present, the Central Hall is used for holding joint sittings of both the houses of parliament and also used for address by the President in the commencement of first session after each general election.