Oh wait, I got lost in the alley. The thingy is still there:
gsv
I think it's so one can glance out to see what trucks are in the alley.
This is the back of the Security Bank Bldg at 514 Spring Street (now part of the LA Theater Center)
gsv
"514 S. Spring Street – Built in 1916, the one-story building was designed by John Parkinson in a Greek-Revival style with Ionic columns. In addition to the columns, the building is known for its lobby with a large 50 by 100-foot stained glass ceiling supported by heavy ornamental bronze cornices and marble walls. It been known over the years as the Security Trust & Savings Building, the Security National Bank Building and the President Trading Company"
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wiki
Harlem Place was originally "Center Place", but got nicknamed b/c of jazz clubs (I think). I'm sure we've talked about this before. I'm just a little fuzzy right now.