As Somalia's capital city, many important national institutions are based in Mogadishu. It is the seat of the Federal Government of Somalia established in August 2012, with the Somalia Federal Parliament serving as the government's legislative branch. Abdirahman Omar Osman has been the Mayor of Mogadishu since January 2018. Villa Somalia is the official residential palace and principal workplace of the President of Somalia, Mohamed Abdullahi Mohamed. In May 2012, the First Somali Bank was established in the capital, which organized Mogadishu's first-ever Technology, Entertainment, Design (TEDx) conference. The establishment of a local construction yard has also galvanized the city's real-estate sector. Arba'a Rukun Mosque is one of the oldest Islamic places of worship in the capital, built circa AH 667 (1268–69 CE). The Mosque of Islamic Solidarity in Mogadishu is the largest masjid in the Horn region. Mogadishu Cathedral was built in 1928 by the colonial authorities in Italian Somalia in a Norman Gothic style, and served as the traditional seat of the Roman Catholic Diocese of Mogadiscio. The National Museum of Somalia is based in Mogadishu and holds many culturally important artefacts. The National Library of Somalia is undergoing a US$1.5 million Somali federal government funded renovation, including a new library complex.