Thanks for the photos and info GaylordWilshire.
I was pretty sure it was the Bradbury Building, but like you said,
the roof of the atrium appears to be solid.
It appears as opaque as the roof on the old City Hall tower.
Boy, wasn't Coulter's a beautiful example of streamline moderne.
Here are a few photos I have of the store.
usc digital archive
Above: At this point it was no longer Coulter's.
Below: A close up of it's wonderful lines.
usc digital archive
This elegant building survived until 1980.