California Code, Probate Code - PROB § 2570

(a) The guardian or conservator, after authorization by order of the court, may invest the proceeds of sales and any other money of the estate as provided in the order.

(b) To obtain an order of the court authorizing a transaction under subdivision (a) of this section, the guardian or conservator, the ward or conservatee, or any other interested person may file a petition with the court.

(c) Notice of the hearing on the petition shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1. The court may order that the notice be dispensed with.

(d) The court may require such proof of the fairness and feasibility of the transaction as the court determines is necessary.

(e) If the required showing is made, the court may make an order authorizing the transaction and may prescribe in the order the terms and conditions upon which the transaction shall be made.