Cal. Civ. Code § 2924e

(a) The beneficiary or mortgagee of any deed of trust or mortgage on real property either containing one to four residential units or given to secure an original obligation not to exceed three hundred thousand dollars ($300,000) may, with the written consent of the trustor or mortgagor that is either effected through a signed and dated agreement which shall be separate from other loan and security documents or disclosed to the trustor or mortgagor in at least 10-point type, submit a written request by certified mail to the beneficiary or mortgagee of any lien which is senior to the lien of the requester, for written notice of any or all delinquencies of four months or more, in payments of principal or interest on any obligation secured by that senior lien notwithstanding that the loan secured by the lien of the requester is not then in default as to payments of principal or interest.
The request shall be sent to the beneficiary or mortgagee, or agent which it might designate for the purpose of receiving loan payments, at the address specified for the receipt of these payments, if known, or, if not known, at the address shown on the recorded deed of trust or mortgage.
(b) The request for notice shall identify the ownership or security interest of the requester, the date on which the interest of the requester will terminate as evidenced by the maturity date of the note of the trustor or mortgagor in favor of the requester, the name of the trustor or mortgagor and the name of the current owner of the security property if different from the trustor or mortgagor, the street address or other description of the security property, the loan number (if available to the requester) of the loan secured by the senior lien, the name and address to which notice is to be sent, and shall include or be accompanied by the signed written consent of the trustor or mortgagor, and a fee of forty dollars ($40). For obligations secured by residential properties, the request shall remain valid until withdrawn in writing and shall be applicable to all delinquencies as provided in this section, which occur prior to the date on which the interest of the requester will terminate as specified in the request or the expiration date, as appropriate. For obligations secured by nonresidential properties, the request shall remain valid until withdrawn in writing and shall be applicable to all delinquencies as provided in this section, which occur prior to the date on which the interest of the requester will terminate as specified in the request or the expiration date, as appropriate. The beneficiary or mortgagee of obligations secured by nonresidential properties that have sent five or more notices prior to the expiration of the effective period of the request may charge a fee up to fifteen dollars ($15) for each subsequent notice. A request for notice shall be effective for five years from the mailing of the request or the recording of that request, whichever occurs later, and may be renewed within six months prior to its expiration date by sending the beneficiary or mortgagee, or agent, as the case may be, at the address to which original requests for notice are to be sent, a copy of the earlier request for notice together with a signed statement that the request is renewed and a renewal fee of fifteen dollars ($15). Upon timely submittal of a renewal request for notice, the effectiveness of the original request is continued for five years from the time when it would otherwise have lapsed. Succeeding renewal requests may be submitted in the same manner. The request for notice and renewals thereof shall be recorded in the office of the county recorder of the county in which the security real property is situated. The rights and obligations specified in this section shall inure to the benefit of, or pass to, as the case may be, successors in interest of parties specified in this section. Any successor in interest of a party entitled to notice under this section shall file a request for that notice with any beneficiary or mortgagee of the senior lien and shall pay a processing fee of fifteen dollars ($15). No new written consent shall be required from the trustor or mortgagor.
(c) Unless the delinquency has been cured, within 15 days following the end of four months from any delinquency in payments of principal or interest on any obligation secured by the senior lien which delinquency exists or occurs on or after 10 days from the mailing of the request for notice or the recording of that request, whichever occurs later, the beneficiary or mortgagee shall give written notice to the requester of the fact of any delinquency and the amount thereof.
The notice shall be given by personal service, or by deposit in the mail, first-class postage paid. Following the recording of any notice of default pursuant to Section 2924 with respect to the same delinquency, no notice or further notice shall be required pursuant to this section.
(d) If the beneficiary or mortgagee of any such senior lien fails to give notice to the requester as required in subdivision (c), and a subsequent foreclosure or trustee’s sale of the security property occurs, the beneficiary or mortgagee shall be liable to the requester for any monetary damage due to the failure to provide notice within the time period specified in subdivision (c) which the requester has sustained from the date on which notice should have been given to the earlier of the date on which the notice is given or the date of the recording of the notice of default under Section 2924, and shall also forfeit to the requester the sum of three hundred dollars ($300). A showing by the beneficiary or mortgagee by a preponderance of the evidence that the failure to provide timely notice as required by subdivision (c) resulted from a bona fide error notwithstanding the maintenance of procedures reasonably adapted to avoid any such error shall be a defense to any liability for that failure.
(e) If any beneficiary or mortgagee, or agent which it had designated for the purpose of receiving loan payments, has been succeeded in interest by any other person, any request for notice received pursuant to this section shall be transmitted promptly to that person.
(f) Any failure to comply with the provisions of this section shall not affect the validity of a sale in favor of a bona fide purchaser or the rights of an encumbrancer for value and without notice.
(g) Upon satisfaction of an obligation secured by a junior lien with respect to which a notice request was made pursuant to this section, the beneficiary or mortgagee that made the request shall communicate that fact in writing to the senior lienholder to whom the request was made. The communication shall specify that provision of notice pursuant to the prior request under this section is no longer required.