This photo has been floating in
 and out of Facebook of late, each time from a different source.  
Most recently it appeared on a site called "Hollywood's Garden of Allah 
Novels," which has me scratching my head.  Ironically, it's the 
site with the actual photo provenance, which says it illustrated an 
article in the February 3, 1941 Los Angeles Herald-Examiner. I guess 
you've figured out those are former streetcars, each of which apparently
 contained three units renting for $30 a month.  The Hollywood site
 didn't have an address and guessed that this location was in San 
Diego.  The Vintage San Diego site said it was on the northeast 
corner of India and Laurel, which -- if you know Laurel Street Hill -- 
doesn't feel right.  The snippet below, from the 1943 City 
Directory, seems to back up that assertion.  So, Laurel Street Hill
 would be a couple of blocks to the right, and Lindbergh Field would be 
over your shoulder to your left.