California Code, Insurance Code - INS § 1192.6

(a) An insurer, except an insurer authorized to transact mortgage guaranty insurance as defined in Section 119, may invest in a mortgage, mortgage-backed bond, or a mortgage participation, pass-through, conventional pass-through, trust or participation certificate, which is secured by or represents an undivided interest in any loan secured by real property if the loan is a permitted investment for the insurer or in a pool of those loans if each is a permitted investment for an insurer;  and for which there exists, at the time of making the investment, a resale market.

(b) If the loan or pools of loans have been transferred or contributed by an insurer to a corporation, all the voting securities of which are owned by the insurer, then the mortgage, mortgage-backed bond, or mortgage participation, pass-through, conventional pass-through, trust or participation certificate secured by or representing an undivided interest in the loan or pool of loans shall not be revalued solely due to that transfer.  Any subsequent transfer to an affiliate from the wholly owned subsidiary shall be valued at the lower of book value or market value.