which office building with the highest floors above ground whose instance is skyscraper?
select ?ent where { ?ent wdt:P31 wd:Q1021645 . ?ent wdt:P1101 ?obj . ?ent wdt:P31 wd:Q11303 } ORDER BY DESC(?obj)LIMIT 5 
office building: Q1021645 skyscraper: Q11303