Have you checked out Kenneth McIntyre's new Facebook group Photos of Los Angeles? He's been roaming through the archives and picking out many treasures I haven't seen before.
A good example is this 1952 view of the Hippodrome on Main St. as the proscenium arch was being demolished. Click on the photo to go to the full size view on Facebook.
Or check out the new Hippodrome Theatre page I just put together for more data and photos.