query: SELECT DISTINCT ?item ?itemLabel ?plz WHERE 
  {
    ?item wdt:P31 wd:Q79007.
    ?item wdt:P131 wd:Q1731.
    ?item rdfs:label ?name.
    optional {
      ?item wdt:P281 ?plz
    }
    MINUS {?item wdt:P138 [] }
    FILTER (!CONTAINS( ?name, " "))
    SERVICE wikibase:label { bd:serviceParam wikibase:language "de". }
  } ORDER BY ?itemLabel