One of the private schools I was considering for DD last year is closing at the end of this school year so I can relate to your concern about school closure because where we live, we might not be able to transfer to another good private school all that easily.

However, I'd be very hesitant to send any children with unusual abilities to a school that has an anti-acceleration policy. One thing for certain is that gifted children's needs change very quickly. Ideally, you'd want a school that is willing to be flexible to meet your child's needs.

It sounds like you live in a large city with many educational options. Have you looked into less mainstream options? Are there any charter Montessori schools or other child-centered alternatives?