Main Street Gym
I looked through hundreds of Joe Louis' pictures today before I finally found two from the Main Street Gym. Of course, since these are from 1939, this is the old Main Street Gym.
Here's Louis on March 28, 1939, with a local fighter named Ernest "Dynamite" Jackson, a Pacific Coast heavyweight champion who later became the first African American to get a referee's license.
Photograph by the Los Angeles Times
This is Louis sparring with Paul Williams at the Main Street Gym in a photo published April 16, 1939, shortly before Louis' bout with Jack Roper on April 17, 1939, at Wrigley Field. Roper lasted 2 minutes, 20 seconds with Louis.