Question: What city is Corriere del Trentino's owner's headquarter located?

full_context: Document 1: Corriere dei Piccoli: The Corriere dei Piccoli (Italian for "Courier of the Little Ones"), later renamed Corriere dei Ragazzi ("Children’s Courier") and nicknamed Corrierino ("Little Courier"), was a weekly magazine for children published in Italy from 1908 to 1995. It was the first Italian periodical to make a regular feature of publishing comic strips.
Document 2: Linkiesta: Linkiesta is an independent Italian online newspaper of investigative journalism, in-depth analysis and commentary. It was launched on 31 January 2011 and, from 30 November 2014, the editor in chief is Francesco Cancellato. The first editor in chief was Jacopo Tondelli.
Document 3: De Agostini: De Agostini S.p.A. is an Italian holding company that coordinates the strategic operating companies - De Agostini Editore, De Agostini Communications, IGT and DeA Capital - and makes financial investments, among which the main investment is a minority stake in Assicurazioni Generali. It was founded in 1901 by the geographer Giovanni De Agostini in Rome, Italy, and later moved to Novara, Italy.
Document 4: Agenzia Giornalistica RCS: Agenzia Giornalistica RCS, abbreviated as AGR, is an important Italian news agency owned by the Italian media conglomerate RCS MediaGroup, based in Milan, Italy, with two offices in Rome and Florence.
Document 5: Il Gazzettino: Il Gazzettino is an Italian daily local newspaper, based in Mestre, Italy. It is the main newspaper in the Northeast Italy and is one of the oldest newspapers in Italy.
Document 6: TG5: TG5 ("TeleGiornale 5") is the brand for Italian TV channel of Mediaset network Canale 5's news programmes. They are shown domestically on Canale 5 and Mediaset TGcom24 several times throughout the day. The audience of this newscast, notably in its 08:00 PM edition, has by far the highest audience among commercial TVs in Italy. The show broadcasts from Rome. The present editor-in-chief is Clemente Mimun.
Document 7: Corriere del Mezzogiorno: Corriere del Mezzogiorno is an Italian local newspaper owned by RCS MediaGroup and based in Naples, Italy, with editorial offices in all over Southern Italy. It was launched in 1997 in Campania to handle the growing competition with "la Repubblica". The Apulian edition was launched in 2002.
Document 8: Corriere Canadese: Corriere Canadese ("The Canadian Courier") is an Italian-language daily newspaper published in Toronto, Ontario, Canada. The publication is distributed exclusively in Ontario and Quebec, primarily throughout the Greater Toronto and the Greater Montreal areas.
Document 9: New York City: New York City is additionally a center for the advertising, music, newspaper, digital media, and publishing industries and is also the largest media market in North America. Some of the city's media conglomerates and institutions include Time Warner, the Thomson Reuters Corporation, the Associated Press, Bloomberg L.P., the News Corporation, The New York Times Company, NBCUniversal, the Hearst Corporation, AOL, and Viacom. Seven of the world's top eight global advertising agency networks have their headquarters in New York. Two of the top three record labels' headquarters are in New York: Sony Music Entertainment and Warner Music Group. Universal Music Group also has offices in New York. New media enterprises are contributing an increasingly important component to the city's central role in the media sphere.
Document 10: Associated Press of Pakistan: Associated Press of Pakistan (APP) is a government-operated national news agency of Pakistan. The name APP should not to be confused with Associated Press Service (APS) is a private independent Pakistani news agency and other the much larger Associated Press news agency (AP), based in New York, though it is a subscriber to both AP and Reuters, based in London. APP has News Exchange Agreements with 37 Foreign News Agencies and more than 500 correspondents.
Document 11: Communications in Somalia: Other radio stations based in Mogadishu include Mustaqbal Media corporation and the Shabelle Media Network, the latter of which was in 2010 awarded the Media of the Year prize by the Paris-based journalism organisation, Reporters Without Borders (RSF). In total, about one short-wave and ten private FM radio stations broadcast from the capital, with several radio stations broadcasting from the central and southern regions.
Document 12: TV4 Newsmill: Newsmill was owned by the Bonnier Group, a giant media conglomerate, Proventus, an investment group, Nelson and Lagercrantz. There are links to other mainstream media, since Bonnier also own Dagens Nyheter, Expressen and Résumé, which frequently comment on opinion articles in Newsmill. Expressen also published, every Sunday, a summary of the debates on Newsmill. The site was shut down in June 2013.
Document 13: Corriere del Trentino: Corriere del Trentino is an Italian local newspaper owned by RCS MediaGroup and based in Trento, Italy. It was launched in 2003 in Trentino, on the basis of "Corriere del Mezzogiorno".
Document 14: Rossiya Segodnya: "Rossiya Segodnya" incorporates the former "RIA Novosti" news service and the international radio service "Voice of Russia" (formerly "Radio Moscow"). According to the Decree of the President of Russia, the mandate of the new agency is to "provide information on Russian state policy and Russian life and society for audiences abroad." Vladimir Putin's chief of staff, Sergei Ivanov, said that "Rossiya Segodnya" was being created in order to increase the cost efficiency in Russian state media. However, RIA Novosti's own report about the move speculated it was an attempt to consolidate state control over the media sector and Western news outlets stated that this was also a move by Putin to propagate a more pleasant image of Russia abroad.
Document 15: La Stampa: La Stampa (meaning "The Press" in English) is an Italian daily newspaper published in Turin, Italy. It is distributed in Italy and other European nations. It is one of the oldest newspapers in Italy.
ground_truth: Milan
sub_queries: Corriere del Trentino >> owned by Answer: RCS MediaGroup
RCS MediaGroup >> headquarters location Answer: Milan