We're in Midtown Palo Alto at 719 Colorado Ave.  (Near Oregon Expressway and Middlefield Road)  But it is hidden behind the office building that is 711 Colorado.  The best way to get there is to go south on Middlefield Road from Oregon Expressway.  Turn left on Colorado and then another left into the first driveway.  Go straight ahead and through an overhang that's sort of like a tunnel.  Park in the large lot in the back.  Opal'z is the little 2 story blue building that would have been just to your right as you were going through the overhang.