I also had my orientation the wrong way around until I took another look at my second picture and spotted a gasometer in the background. That means we're looking down Ferguson Alley. Here's a better view of the mystery building from November 1933.
USC Digital Library
I think it would just count as being on the end of Calle de Los Negros. I've indicated Jerry's Joynt with the blue arrow and the mystery building with the red arrow in the detail image below.
Detail of picture in
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