Many years ago there were two bookstores in Hollywood that I would frequent. One, just east of Cahuenga on Hollywood Blvd, was Gilbert's Books. This was a full bookstore that offered both new and used books. It also had a large selection of occult books, some of which were quite unusual and rare. I've heard that Israel Regardie used to quietly hang out there, listening amusedly to what some self-styled experts would say concerning those occult books.
When going book shopping in Hollywood, I'd hit Gilbert's first. It was a slightly further trip than to the second store, but its prices on rare and used books were more reasonable. The second store, Cherokee Books, was also on Hollywood