Prairie School commercial building
... that when a Prairie School commercial building in Oak Park, Illinois, housed a department store, the facade was covered with black glass?
... that when a <b id="mwCOo"><a class="mw-redirect" href="./Masonic_Temple_Building_(Oak_Park,_Illinois)" id="mwCOs" rel="mw:WikiLink" title="Masonic Temple Building (Oak Park, Illinois)">Prairie School commercial building</a></b> in <a href="./Oak_Park,_Illinois" id="mwCOw" rel="mw:WikiLink" title="Oak Park, Illinois">Oak Park, Illinois</a>, housed a department store, the facade was covered with black glass?