It's funny how coincidence works. Earlier tonight, when I was looking for pictures of Exposition Park, I came across the picture below.
USC Digital Library
I noticed a roof sign and zoomed in:
Detail of photo above.
Before I had a chance to look up Birch-Smith Storage,
HunterK posted the large pictures above. The picture below is clipped from the one of 7th & Hill.
Detail of photo originally posted by HunterK.
There's only seven years between the photos, so can I assume the two businesses are linked?