In 2015 Ramon Tebar was named  Principal Guest Conductor of an opera house located in what city?
Palau de les Arts Reina Sofia Palau de les Arts Reina Sofia (] ; Spanish: "Palacio de las Artes Reina Sofía" ; anglicised as "Reina (Queen) Sofía Palace of the Arts") is an opera house and cultural centre in Valencia, Spain. It opened on 8 October 2005; its first opera staging was of Beethoven's "Fidelio" on 25 October 2006. Tenor and conductor Plácido Domingo has maintained a special relationship with the Palau since its founding and has established a young singers training program there.
War Memorial Opera House The War Memorial Opera House in San Francisco, California is located on the western side of Van Ness Avenue across from the rear facade of City Hall. It is part of the San Francisco War Memorial and Performing Arts Center. It has been the home of the San Francisco Opera since opening night in 1932.