===
British Raj=== In 1922, a tiny Nazul Office consisting of 10 to 12 officials was set up in the Collectorate of Delhi, which was the first authority to regulate the planned development of the city. In 1937, the office was upgraded to an Improvement Trust, constituted under the provisions of the United Provinces Improvement Act, 1911, to control building operations and regulate land usage.
After Independence India's independence in 1947 and
resultant migration increased Delhi's population from 7 lakhs to 17 lakhs by 1951. All the open spaces were occupied by migrants. Civic services virtually collapsed. The 2 local bodies at that time, the Delhi Improvement Trust and Municipal Body, were not adequately equipped to cope with the changing scenario. Thus, to plan Delhi and to check its rapid and haphazard growth, the Central Government appointed a Committee under the chairmanship of Sh. G D. Birla in 1950. This Committee recommended a Single Planning & Controlling Authority for all the urban areas of Delhi. Consequently, the Delhi Development (Provisional) Authority - DDPA - was constituted by promulgating the Delhi (Control of Building Operations) Ordinance, 1955 with the primary objective of ensuring the development of Delhi by a plan. The aforementioned ordinance was replaced by the Delhi Development Act, 1957 and on 30 December 1957, the Delhi Development Authority acquired its present name and role. ==Master plans==