Oh, me. I just posted to 30 something -- you ladies are being hard on this heavily medicated moderator this morning with-gray areas. lol
Your situation is 2 laws collide in my opinion.
IEP students have the same rights as all other students +. However, the IEP (placement) is not a place/location per se unless a particular campus or location is written into the IEP.
It's my understanding that school districts are at liberty to provide IEP services on whatever campus they choose -- again, unless the IEP is specific about the particular location/campus the "placement/IEP" will be carried out.
If you want to transfer your child to another campus, I'd send a letter via Certified Mail requesting a transfer to that campus.
Now, this is where OCR/504 could kick in. IEP students may not be segregated to a specific campus (there are some caveats to this). So if the transfer school is basically the same as the present school, the sd better have a really good reason for not allowing the transfer.
In case you are not aware, all IEP students are covered under Section 504. (The reverse is not true.)