Cal. Prob. Code § 16355

A trustee shall allocate to principal:

(a) To the extent not allocated to income under this chapter, assets received from a transferor during the transferor’s lifetime, a decedent’s estate, a trust with a terminating income interest, or a payer under a contract naming the trust or its trustee as beneficiary.

(b) Subject to any contrary rules in this article and in Articles 5.1 (commencing with Section 16350) and 5.3 (commencing with Section 16360), money or other property received from the sale, exchange, liquidation, or change in form of a principal asset, including realized profit.

(c) Amounts recovered from third parties to reimburse the trust because of disbursements described in paragraph (7) of subdivision (a) of Section 16371 or for other reasons to the extent not based on the loss of income.

(d) Proceeds of property taken by eminent domain, but a separate award made for the loss of income with respect to an accounting period during which a current income beneficiary had a mandatory income interest is income.

(e) Net income received in an accounting period during which there is no beneficiary to whom a trustee may or must distribute income.

(f) Other receipts allocated to principal as provided in Article 5.3 (commencing with Section 16360).