Some more pics from the site above - their portrait of Bop City still seems to be in the making:
Musicians Frank Butler, Armando Peraza and George Walker inside Bop City, early 1950s. Frank Jackson Collection
Jimbo Edwards and Arthur Prysock at Bop City, early 1950s. Frank Jackson Collection
A late night jam session at Bop City, mid 1950s. photo by Steve Jackson Jr. - Look at the names on the bass fiddle! Could this be Pony Poindexter and Teddy Edwards?
Source of these pics: https://www.harlemofthewestsf.com