Karl-Marx-Hof
...that the Karl-Marx-Hof in Vienna is the longest single residential building in the world and spans four tram stations?
...that the <b id="mwAe0"><a href="./Karl-Marx-Hof" id="mwAe4" rel="mw:WikiLink" title="Karl-Marx-Hof">Karl-Marx-Hof</a></b> in <a href="./Vienna" id="mwAe8" rel="mw:WikiLink" title="Vienna">Vienna</a> is the longest single <a href="./Residence" id="mwAfA" rel="mw:WikiLink" title="Residence">residential building</a> in the world and spans four <a href="./Tram" id="mwAfE" rel="mw:WikiLink" title="Tram">tram</a> stations?