Question: Which Pittsburgh landmark serves as one of the University of Pittsburgh Stages' primary performance spaces?

Context paragraphs:
Carnegie Building (Pittsburgh): The Carnegie Building, also known as the Carnegie Steel Building, was a high-rise building in Pittsburgh, Pennsylvania.  The structure started construction in 1893 and was completed in 1895 as the city's tallest at the time.  It was the first steel-framed skyscraper in Pittsburgh upon completion.  The building served as the world headquarters of Carnegie Steel Company, a steel producing company of the late 19th century created by industrialist and philanthropist Andrew Carnegie to manage steel mills in the city, and later to become U.S. Steel.  The building was a Downtown Pittsburgh landmark and was located at 428-438 Fifth Avenue.  It was torn down in 1952 for an expansion of Kaufmann's flagship store.

Derek Brueckner: Derek Brueckner (b 1965) is a Canadian artist living in Winnipeg, Manitoba.  He is recognized for working with the figure in performance contexts at gallery and performance spaces in Canada, USA and Europe.  Canadian spaces include Plug-In Institute of Contemporary Art (1998 & 2010) Gallery 111 (2008) Ace Art Inc (2000) New York City spaces include the Collective Unconscious (2002) Local Project http://www.localproject.org/ (2012) and 3rd EYE sol http://www.3rdeyesol.com (2013).  European spaces include Fortezza da Basso (Florence 2001)

List of concert halls: A concert hall is a cultural building with a stage which serves as a performance venue and an auditorium filled with seats.  While early halls built in the 18th and 19th century were designed for classical orchestra, concerto and opera concerts and ballet performances, halls built in the 20th and 21st century were often built to accommodate a wider range of performance types, including musicals.  In the 2010s, popular music such as rock music and traditional music such as folk music are also performed in these venues.  Many concert halls exist as one of several halls or performance spaces within a larger performing arts center.  In many towns, the concert hall is combined with a convention center.  Concert halls typically also contain orchestral rehearsal rooms.  Many larger cities have both public and private concert halls.  Particularly in smaller cities with fewer alternative venues, concert halls may also be used to accommodate other activities, from theatrical performances to academic presentations and university graduation ceremonies.

No Name Players: No Name Players is a professional theatre company based in Pittsburgh, Pennsylvania.  Founded in 2000 by Don DiGiulio at Marshall University in Huntington, West Virginia, the theatre company began as a creative outlet for DiGiulio and his classmates to hone their craft outside of college-related performance opportunities.  It has since evolved to become an important part of Pittsburgh's theatre scene, establishing its presence in 2004 with a production of Charles Mee's "Big Love", which was recognized as one of the Top Ten Plays of 2004 by the Pittsburgh Post-Gazette.  The company's mission is to "present unique and challenging theatrical productions by both new and established playwrights with an emphasis on the collaborative nature of theatre through ensemble."  It is notable for its "SWAN Day" celebration, which is an annual theatrical event that features short plays and other performance pieces that are created primarily by women, in connection with the international holiday SWAN (Support Women Artists Now) Day which occurs on the last Saturday of Women's History Month.  The company has no performance space of its own but has used performance spaces around Pittsburgh, including Pittsburgh Playwrights Theatre Company, Bricolage Production Company, and the Grey Box Theatre.  It has received attention from Pittsburgh Post-Gazette, Pittsburgh Tribune-Review, Out Online, and Pittsburgh City Paper.

Zellerbach Hall: Zellerbach Hall is a multi-venue performance facility on the campus of the University of California, Berkeley, west of Lower Sproul Plaza.  It was designed by architect and professor Vernon DeMars and completed in 1968.  The facility consists of two primary performance spaces: the 1,984-seat Zellerbach Auditorium, and the 500-seat Zellerbach Playhouse.

Pittsburgh Playhouse: Pittsburgh Playhouse is Point Park University's performing arts center located in Pittsburgh, Pennsylvania.  It houses three performance spaces and is home to The Rep, Point Park's resident professional theatre company, as well as three student companies—Conservatory Theatre Company, Conservatory Dance Company, and Playhouse Jr.  The Conservatory Theatre Company offers five productions each year that are performed by undergraduate students at Point Park; this season consists of a mixture of established plays and musicals, as well as occasional new works.

Street theatre: Street theatre is a form of theatrical performance and presentation in outdoor public spaces without a specific paying audience.  These spaces can be anywhere, including shopping centres, car parks, recreational reserves, college or university campus and street corners.  They are especially seen in outdoor spaces where there are large numbers of people.  The actors who perform street theatre range from buskers to organised theatre companies or groups that want to experiment with performance spaces, or to promote their mainstream work.

University of Pittsburgh Stages: University of Pittsburgh Stages, previously known as the University of Pittsburgh Repertory Theatre or Pitt Rep, is the flagship production company for the University of Pittsburgh Department of Theatre Arts.  Pitt Stages features students on stage with professional actors and teaching artists staging public performances of classic masterpieces, contemporary productions, and student-directed labs.  The company's primary performance spaces include the University's Stephen Foster Memorial and Cathedral of Learning.

Caravan Theatre of Pittsburgh: Caravan Theatre of Pittsburgh is a theatre company located in Pittsburgh, Pennsylvania.  Established in 2007 by John Gresh, the company has produced contemporary plays, such as "800 Words: The Transmigration of Philip K. Dick", "Savage in Limbo" and "Risk Everything".  The company took a hiatus in 2008 due to the recession but returned in 2012 with a well-received production about the life of Philip K. Dick, featuring Dana Hardy reprising a role she originated when she and playwright Victoria Stewart were both in graduate school.  Caravan Theatre of Pittsburgh has held performances in both the Penn Avenue and Liberty Avenue performance spaces of Pittsburgh Playwrights Theatre Company.

Cathedral of Learning: The Cathedral of Learning, a Pittsburgh landmark listed in the National Register of Historic Places, is the centerpiece of the University of Pittsburgh's main campus in the Oakland neighborhood of Pittsburgh, Pennsylvania, United States.  Standing at 535 ft , the 42-story Late Gothic Revival Cathedral is the tallest educational building in the Western hemisphere and the second tallest university building (fourth tallest educationally-purposed building) in the world.  It is also the second tallest gothic-styled building in the world.  The Cathedral of Learning was commissioned in 1921 and ground was broken in 1926.  The first class was held in the building in 1931 and its exterior finished in October 1934, prior to its formal dedication in June 1937.

Supporting paragraphs: University of Pittsburgh Stages Cathedral of Learning
Answer: The Cathedral of Learning