 Recognized for excellence in architectural journalism, he was awarded the 1990 Prix Paul-Henri Lapointe in the category "History, Criticism and Theory" by the Ordre des architectes du Québec.Castro was awarded grants by the Canada Council and the Graham Foundation for Advanced Studies in the Fine Arts to research Rogelio Salmona.He was also awarded grants from the Graham Foundation and the Institut de recherche en histoire de l’architectura (IRHA) for his collaborative research on Arthur Erickson.