El Molino Viejo 
... that El Molino Viejo , a grist mill built in 1816 by native Indian converts from the San Gabriel Mission, is the oldest commercial building in Southern California?
... that <b id="mwBIU"><a href="./El_Molino_Viejo" id="mwBIY" rel="mw:WikiLink" title="El Molino Viejo">El Molino Viejo</a> </b> <i id="mwBIc">(pictured)</i>, a <a class="mw-redirect" href="./Grist_mill" id="mwBIg" rel="mw:WikiLink" title="Grist mill">grist mill</a> built in 1816 by <a href="./Tongva" id="mwBIk" rel="mw:WikiLink" title="Tongva">native Indian</a> converts from the <a href="./Mission_San_Gabriel_Arcángel" id="mwBIo" rel="mw:WikiLink" title="Mission San Gabriel Arcángel">San Gabriel Mission</a>, is the oldest commercial building in <a href="./Southern_California" id="mwBIs" rel="mw:WikiLink" title="Southern California">Southern California</a>?