What is the {architectural firm} for {architect} of {Burj Khalifa}
By whom is the originator of the Burj Khalifa employed?
By whom is the designer of the Burj Khalifa  employed?
SELECT DISTINCT ?x WHERE { ?x rdf:type ontology:architectural_firm . resource:Burj_Khalifa property:architect ?x }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12495> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P84> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q4387609> } 
 select distinct ?obj where { wd:Q12495 wdt:P84 ?obj . ?obj wdt:P31 wd:Q4387609 } 
Skidmore Owings Merrill