What is the {office building} with the {MIN(cost)} whose {country} is {United States of America}  ?
What is the least expensive american building?
What is the cheapest office building in the United States ?
SELECT ?s WHERE { ?s rdf:type ontology:office_building . ?s property:cost ?z . ?s property:country resource:United_States_of_America }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1021645>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2130>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P17> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q30> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q1021645 . ?ent wdt:P2130 ?obj . ?ent wdt:P17 wd:Q30} ORDER BY ASC(?obj)LIMIT 5 
Penn Center Suburban Station One Charles Center Transamerica Pyramid Wells Fargo Center Empire State Building