We see a brief shot of a list of businesses that appear to be occupying the Bradbury Building in which the Outer Limits episode The Time Mirror was filmed.
I can see what looks like (all in the first column) a Magazine (distributor?). Also an attorney and maybe Steel companies (possibly more than one?)
Is this the real business directory for the Bradbury or something created by makers of The Outer Limits?
I believe in the "C" listings there is a Columbia Steel and Shafting Co. Now, this is a 60 year old episode and nothing shows up in LA but Google shows a company with that exact name now in Atlanta. This does indicate that possibly a real business directory was used.
I note that the first column's first few letters are cut off but using the remaining letters allowed me to guess Columbia.
I have also found: Continental News Service. This was also apparently a real business at the time of the JFK assassination:
If you search the above for "Goldstein" you can find an Ira Goldstein of the Continental News Service.
Googling on Ira Goldstein's name we see that he lived in Los Angeles at least when Bobby Kennedy was shot in 1968 and was both shot during the assassination and was employed by the Continental News.