Well, I found a photo or two, but they won't come across here. Try googling The Realty Board Building as 631 S. was once known as that, at

http://forum.skyscraperpage.com/showthread.php?p=6922042

(Noirish L.A. site) and see if you can spot it between the Hotel Grant and the Union Oil Building. If you get to the general site, it will be a bit of a pain, as you must scroll through a lot of old photos until S. Spring Street finally appears.