Here are a couple of comparison shots I was finally able to piece together.
Below: The Baine Building at 6601-6609 Hollywood Blvd in the 1930s.
Looks like it was a B of A.
usc digital library
Below: The Baine Building at 6601-6609 Hollywood Blvd. today.
unknown
I'd love to rent that little room at the top on the left hand side.