The fact there are a lot of jobs there is no relevant. So does places like Irvine but homes in Irvine fail in comparison to Newport and home prices in Irvine do not affect prices in Newport.
The oppisite is true. Home prices in San Diego can have an effect though on Temecula and all other areas.
That makes no sense. If they are related one way then they are related both ways. SD cannot affect Temecula with out the converse being true.