and Highways. Meanwhile, the Department of Science and Technology is based in Taguig while the Department of Tourism has its headquarters in Makati. Important economic and financial institutions headquartered in the region are the Asian Development Bank, Bangko Sentral ng Pilipinas, Development Bank of the Philippines, Land Bank of the Philippines and the National Economic and Development Authority. The main office of the Government Service Insurance System in Pasay serves as home to the Senate of the Philippines. Meanwhile, the House of Representatives of the Philippines is based in the Batasang Pambansa Complex, Quezon City along with the Sandiganbayan. The Coconut Palace once served as the official office and residence of the Vice President of the Philippines in 2010–2016. The Quezon City Reception House has been serving this purpose since 2016. Administrative divisions The political and administrative boundaries of the National Capital Region has not changed since its formation in 1975 as a public corporation under Presidential Decree No. 824. They are composed of sixteen independent cities, classified as highly urbanized cities, and one independent municipality: Pateros. Districts Unlike other administrative regions in the Philippines, Metro Manila is not composed of provinces. Instead, the region is divided into four geographic areas called "districts." The districts have their district centers at the four original cities in the region: the city-district of Manila (Capital District), Quezon City (Eastern Manila), Caloocan (Northern Manila, also informally known as Camanava), and Pasay (Southern Manila). The districts serve mainly to organize the region's local government units for fiscal and statistical purposes. Future expansion There is a high demand for the inclusion of San Pedro, Laguna in Metro Manila. Support groups from the local government and non-government organizations are striving to incorporate San Pedro into Metro Manila. San Pedro is being looked at as the 18th member of Metro Manila. Former Metro Manila Development Authority (MMDA) Chairman Francis Tolentino is pushing for the inclusion of San Pedro in the National Capital Region, to eventually become its 18th member city. Tolentino said that in the first meeting of the MMDA Council of mayors in January 2015, he will push for the inclusion of the city to the MMDA. Demographics Metro Manila has a population of according to the 2020 national census. Its total urban area, composed of the urban agglomeration which refers to the continuous urban expansion of Metro Manila into the provinces of Bulacan, Cavite, Laguna and