Question: The 2011 Euroleague Final Four games were held in an arena designed by whom?

Context paragraphs:
EuroLeague All-Final Four Team: The EuroLeague All-Final Four Team, or FIBA SuproLeague All-Final Four Team, was an award given by Europe's premier level league, the EuroLeague, to the top five basketball players of each season's EuroLeague Final Four competition.  The EuroLeague Final Four MVP, was selected among the five players of the EuroLeague All-Final Four Team.  The award existed during the era in which the EuroLeague was organized by FIBA Europe.  It was given for the last time by the FIBA SuproLeague, during the 2000–01 season's FIBA SuproLeague Final Four.  After the Euroleague Basketball Company took over control of the EuroLeague, the award was no longer given out, and was replaced by the All-EuroLeague Team award, which was an award for the competition's whole season, up until the EuroLeague Final Four stage.

2011 Euroleague Final Four: The 2011 Euroleague Final Four was the concluding EuroLeague Final Four tournament of the Euroleague 2010–11 season.  It was held on May 6–8, 2011.  All of the games were held at the Palau Sant Jordi, in Barcelona, Spain.  Panathinaikos won its 6th EuroLeague championship.  Dimitris Diamantidis was named the Final Four MVP.

2015 Euroleague Final Four: The 2015 Euroleague Final Four was the concluding EuroLeague Final Four tournament of the 2014–15 Euroleague season.  The Final Four was held on 15 and 17 May 2015.  All of the games were played at the Barclaycard Center, in Madrid, Spain.  It was the third time the city of Madrid hosted the Final Four, and the 6th time the Final of the EuroLeague was played there.

2016 Euroleague Final Four: The 2016 Euroleague Final Four was the concluding EuroLeague Final Four tournament of the 2015–16 Euroleague season, which was the 59th season of Europe's premier club basketball tournament, and the 16th season since it has been organised by Euroleague Basketball.  The Final Four was played at the Mercedes-Benz Arena, in Berlin, Germany, on May 2016.  CSKA Moscow won its 7th EuroLeague title, after beating Fenerbahçe in the championship game, by a score of 101–96, in overtime.

2010 Euroleague Final Four: The 2010 Euroleague Final Four was the concluding EuroLeague Final Four tournament that determined the winner of the 2009–10 Euroleague season.  It was held at the Palais Omnisports de Paris-Bercy, Paris, France on May 7 and 9, 2010.  The contestants were four former EuroLeague champions, and three of the previous year's EuroLeague Final Four teams CSKA Moscow, Olympiacos, Regal FC Barcelona, plus new entry Partizan Belgrade.  Barcelona won their second EuroLeague crown, beating Olympiacos 86–68, in the final.

EuroLeague Final Four: The EuroLeague Final Four is the final four format championship of the European-wide top-tier level EuroLeague professional club basketball competition.  The Euroleague Basketball Company used the final four format for the first time in 2002, following the 2001 FIBA SuproLeague Final Four, which was the last final four held by FIBA Europe.  In the original FIBA Europe competition, as seen below, the final four was used for the first time at the 1966 FIBA European Champions Cup Final Four.  The final four format was used again the next year, with the 1967 FIBA European Champions Cup Final Four, but was then abandoned.

2000 FIBA EuroLeague Final Four: The 2000 FIBA EuroLeague Final Four was the FIBA EuroLeague Final Four tournament of the 1999–2000 season.  It was the second to last edition of the FIBA EuroLeague Final Fours that were organized by FIBA Europe.  For the next edition of the tournament, it would be replaced by the FIBA SuproLeague's 2001 FIBA SuproLeague Final Four, and the new Euroleague Basketball competition's 2001 Finals series, which was organized by the Euroleague Basketball Company.

2018 EuroLeague Final Four: The 2018 EuroLeague Final Four will be the concluding EuroLeague Final Four tournament of the 2017–18 EuroLeague season, the 61st season of Europe's premier club basketball tournament, and the 18th season since it is organised by Euroleague Basketball.  The Final Four will be played at the Kombank Arena in Belgrade, Serbia, in May 2018.

Palau Sant Jordi: Palau Sant Jordi (] , English: St. George's Palace ) is an indoor sporting arena and multi-purpose installation that is part of the Olympic Ring complex located in Barcelona, Catalonia, Spain.  Designed by the Japanese architect Arata Isozaki, it was opened in 1990.  The maximum seating capacity of the arena is 16,670 for basketball, and 24,000 for musical events.  It is the largest indoor arena in Spain.

EuroLeague Final Four records: EuroLeague Final Four records are the records of the EuroLeague's Final Four tournament.  The EuroLeague is the European-wide top-tier level men's professional club basketball league.  The EuroLeague Final Four has been held every year since 1988, as it was held for the first time in the modern EuroLeague era, at the conclusion of the league's 1987–88 season, with the 1988 EuroLeague Final Four.

Supporting paragraphs: 2011 Euroleague Final Four Palau Sant Jordi
Answer: Arata Isozaki