(I assume you made your comment as I was editing)Wow! Why was production ceased? At least-I'm assuming so?
I believe it was because of budget cuts, deferred maintenance or the zoo going out of elephants altogether until they can devote 15 acres of land to such a project. (Personally rather than seeing orangutans in the Great Ape Passage, I would rather see them in the Monsoon Forest section taking up Grizzly Gulch).