The center's third stage opened in 1979 at the initiative of Kive Staiff, then in his second season as general and artistic director of the Teatro San Martín, and was named in honor of prominent Catalan-Argentine stage director and instructor Antonio Cunill Cabanellas. Dedicated to experimental theatre, the capacity of the room (about 200 spectators) may vary with the movement and changes in the relationship between stage and pit, according to the requirements.
