The Casón del Buen Retiro is an annex of the Museo del Prado complex in Madrid. Following major restoration work, which was completed in October 2007, it now houses the museum's study centre (the Escuela del Prado) and library. Picasso's 1937 Guernica canvas, and the sketches associated with its creation, were displayed at the Casón from 1981, when it was delivered to Spain from New York's Museum of Modern Art (MoMA), to 1992, when it was moved to its current permanent location in a purpose-built gallery at the Museo Nacional Centro de Arte Reina Sofía.