query: SELECT DISTINCT ?item ?possiblecreator WHERE {
    ?item wdt:P195 wd:Q2983474 .
    ?item wdt:P31 wd:Q3305213 .
    ?item p:P170 ?creatorstatement .
    OPTIONAL { ?creatorstatement ?qualifier ?possiblecreator .
               ?qualifierproperty wikibase:qualifier ?qualifier }.
    ?item schema:description ?itemdesc.
    FILTER(regex(str(?itemdesc), "työhuone