Question:  The 2008–09 Copa del Rey final was held at a football stadium which as a seating capacity of what?

full_context: Document 1: 2009 Supercopa de España: The 2009 Supercopa de España was two-legged Spanish football match-up played on 16 August and 23 August 2009. It was contested by Athletic Bilbao, the 2008–09 Copa del Rey runners-up, and Barcelona, the 2008–09 Primera División and 2008–09 Copa del Rey winners.
Document 2: 2008–09 UEFA Champions League: The 2008–09 UEFA Champions League was the 54th edition of Europe's premier club football tournament and the 17th edition under the current UEFA Champions League format. The final was played at the Stadio Olimpico in Rome on 27 May 2009. It was the eighth time the European Cup final has been held in Italy and the fourth time it has been held at the Stadio Olimpico. The final was contested by the defending champions, Manchester United, and Barcelona, who had last won the tournament in 2006. Barcelona won the match 2–0, with goals from Samuel Eto'o and Lionel Messi, securing The Treble in the process. In addition, both UEFA Cup finalists, Werder Bremen and Shakhtar Donetsk featured in the Champions League group stage.
Document 3: Estadio de La Cartuja: Estadio La Cartuja de Sevilla, also known as Estadio Olímpico de Sevilla is a multi-purpose stadium situated in the Isla de la Cartuja in Seville, Spain. It is used mostly for football and it is commonly referred to as simply 'la Cartuja'. It was completed in 1999 for the World Championships in Athletics and seats 60,000 people. It was the venue for the 2003 UEFA Cup Final between Celtic and Porto.
Document 4: Estadio José Zorrilla (1940): Estadio José Zorrilla was a multi-use stadium in Valladolid, Spain. It was initially used as the stadium for Real Valladolid matches. The first match took place on 3 November 1940 with a 4-1 win over Arenas Club de Getxo. The capacity of the stadium was 18,000 spectators, although this was extended for the last game of the 1980-81 season to 22,0000 with the use of temporary seating for a match against Real Madrid. It was replaced by the current Estadio José Zorrilla in 1982, although the reserve team, Real Valladolid B, carried on using the ground until 1984. The site is now occupied by a branch of the El Corte Inglés department store.
Document 5: Santiago Bernabéu Stadium: The Santiago Bernabéu Stadium (Spanish: "Estadio Santiago Bernabéu" ] ), is the home stadium of Real Madrid since its completion in 1947, with a current seating capacity of 81,044.
Document 6: Mestalla Stadium: Mestalla Stadium (Spanish: "Estadio de Mestalla" ] , ] ) is a football stadium in Valencia, Spain. The stadium is the home ground of Valencia Club de Fútbol and has a capacity of 49,500 seats.
Document 7: 2011 Copa del Rey Final: The 2011 Copa del Rey Final was the 109th final since its establishment. The match was a traditional 'El Clásico' rivalry between Barcelona and Real Madrid which took place on 20 April 2011 at the Mestalla Stadium, making it the sixth such Copa del Rey final (the last one was played also in Valencia on 5 April 1990), just four days after the two teams played each other in La Liga and seven days before they played each other in the UEFA Champions League first leg semi-final.
Document 8: 2008–09 Copa del Rey: The 2008–09 Copa del Rey was the 107th staging of the Copa del Rey. The competition started on August 23, 2008 and concluded on May 13, 2009 with the final, held at the Mestalla Stadium in Valencia, in which Barcelona lifted the trophy for the 25th time in their history with a 4–1 victory over Athletic Bilbao, who qualified for the third qualifying round of the 2009–10 UEFA Europa League. The defending cup holders were Valencia, but they were eliminated in the quarter-finals.
Document 9: Mini Estadi: Mini Estadi (] , meaning in English "Mini Stadium") is a football stadium located in Barcelona, Catalonia, Spain. The 15,276-seat stadium is situated across from Camp Nou, the home stadium of FC Barcelona.
Document 10: City of Manchester Stadium: The City of Manchester Stadium in Manchester, England, also known as the Etihad Stadium for sponsorship reasons, is the home ground of Manchester City Football Club and, with a domestic football capacity of 55,097, the fourth-largest in the Premier League and eighth-largest in the United Kingdom.
Document 11: Valencia CF: Valencia Club de Fútbol (] , ] ; also known as Valencia CF, Valencia or Los Che) is a Spanish football club based in Valencia. They play in La Liga and are one of the most successful and biggest clubs in Spanish football and European football. Valencia have won six La Liga titles, seven Copa del Rey titles, two Inter-Cities Fairs Cups (the predecessor to the UEFA Cup), one UEFA Cup, one UEFA Cup Winners' Cup and two UEFA Super Cups. They also reached two UEFA Champions League finals in a row, losing to La Liga rivals Real Madrid in 2000 and Bayern Munich on penalties after a 1–1 draw in 2001. Valencia were also members of the G-14 group of leading European football clubs. In total, Valencia have reached seven major European finals, winning four of them.
Document 12: 2009–10 La Liga: The 2009–10 La Liga season (known as the "Liga BBVA" for sponsorship reasons) was the 79th La Liga since its establishment. Barcelona were the defending champions, having won their 19th La Liga title in the previous season. The campaign began on 29 August 2009 ended on 16 May 2010 due to all top-flight European leagues ending earlier than the previous season because of 2010 FIFA World Cup.
Document 13: 2012–13 Copa del Rey: The 2012–13 Copa del Rey was the 111th staging of the Copa del Rey. The competition began on August 29, 2012 and ended on May 17, 2013 with the final, held at the Santiago Bernabéu in Madrid, in which Atlético Madrid lifted the trophy for the tenth time in their history with a 1–2 victory over hosts Real Madrid in extra time. Barcelona were the defending champions but were eliminated by Real Madrid in the semifinals. Going into the competition, the winners were assured of a place in the group stage of the 2013–14 UEFA Europa League, but both finalists had already qualified for the 2013–14 UEFA Champions League a few weeks before.
Document 14: 2014 Copa del Rey Final: The 2014 Copa del Rey Final was the 112th final of Spain's premier football cup since its establishment. The match was an "El Clásico" between Real Madrid and Barcelona on 16 April 2014 at Mestalla in Valencia, making it the seventh such Copa del Rey final (the last one was also played at the Mestalla on 20 April 2011). Real Madrid won the cup for the 19th time after a 2–1 win.
Document 15: 2008–09 FC Barcelona season: In 2008–09, Futbol Club Barcelona started a new era with a new manager, former player and Barcelona Atlètic coach Pep Guardiola, who led the team to the first treble in Spanish football history. After selling off high-profiled players such as Deco and Ronaldinho, Barcelona played scintillating football throughout the season, winning the Copa del Rey, La Liga and the UEFA Champions League. This Barcelona squad is considered as one of the best in history.
ground_truth: 49,500