Reinvesting in California's JusticeSystem: A Three-Year Blueprint for a fully functioning Judicial Branch note the following for the proposed two new chambers for 4/2:
Appellate Court Justices ($2.3 million) — Due to increased workload, two additional appellate court justices are needed in Division Two of the Fourth Appellate District. The Judicial Council seeks funding for the two new positions at an estimated cost of $2.3 million for the first year, and $2.1 million annually in ongoing costs.
So, a million a year for a justice, research attorneys, other staff, facilities, etc. seems to be the answer.