Here, there has to be a notice of intent signed immediately stating that the current IEP is (or isn't) being accepted as is with a significant change (being the district change) and any other needed changes. The date for re-writing it can be the annual date, we are past that for Q but it is being drafted, he moved right when the new IEP was to be written so not really anything we could do. I haven't had to do that much but when we had new kids come to our school as a transfer (charter school) we did the same, accepted the IEP as written (with only significant changes related to how our program was run, like DAPE provided in a different way etc.) and then within six weeks we chose to meet and rewrite to make sure the IEP fit (since the change was usually due to some issue and they wanted to update it and make it fit the things we had to offer).... Not sure of the legal time though, is it on writeslaw? Can you call the state dept of ed?