On 7 November 1975, President Ferdinand Marcos signed Presidential Decree No. 824 that established the National Capital Region, and San Juan was among the towns excised from Rizal Province. Residents ratified the conversion of the municipality into a highly urbanised city on 17 June 2007, pursuant to Republic Act No. 9388 ("An Act Converting the Municipality of San Juan into a Highly Urbanized City to be known as the City of San Juan"). Then Representative Ronaldo B. Zamora sponsored the Cityhood Bill in the House of Representatives and worked for its approval.