Who created the stadiums who have been rented by the Boston Red Sox?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/tenant> <http://dbpedia.org/resource/Boston_Red_Sox> . ?x <http://dbpedia.org/property/architect> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Stadium>}
Boston_Red_Sox