"Business" standing to challenge amendments = The Admin Comm'n Blinks
However, the AC didn't find that the ALJ was wrong. Instead, it determined that because another petitioner had standing, the standing of Citizens for Proper Planning was legally irrelevant and didn't need to be decided. It then went on to say that the issue is "debatable" (oh, please!) and asked the Legislature for guidance.
Here's the Final Order (thanks to Larry Sellers for forwarding it to me).