California Code, Probate Code - PROB § 17404

(a) The transfer of the trust property to a trustee in another jurisdiction, or the transfer of the place of administration of the trust to another jurisdiction, will promote the best interests of the trust and those interested in it, taking into account the interest in the economical and convenient administration of the trust.

(b) The transfer will not violate the trust instrument.

(c) Any new trustee to whom the trust property is to be transferred is qualified, willing, and able to administer the trust or trust property under the trust instrument.