Cal. Code Regs. tit. 18, § 5323.4
(b) A valid and complete petition must:
(5) Be signed by the petitioner or by an authorized representative. If the petition is signed by an agent, including an attorney licensed to practice law in the State of California, the agent must be authorized by the petitioner before the time the petition is filed. Both the petitioner's mailing address and the agent's mailing address must be provided in the petition. The following language must be contained in the signature block of the petition:
I certify (or declare) under penalty of perjury under the laws of the State of California that the foregoing and all information herein, including any accompanying statements or documents, is true, correct, and complete to the best of my knowledge and belief and that I am: (1) an officer, partner, or employee of the petitioner authorized to sign this petition; (2) an agent authorized by the petitioner; or (3) an agent who is any attorney licensed to practice law in the State of California, State Bar No. __________, who has been retained by the petitioner and has been authorized by the petitioner to file this petition.
(6) Be accompanied by a statement of authorization, if required as specified herein, or as specified in section 5323.8, Duplicate Petitions. If the petition is signed by an agent, other than an attorney licensed to practice law in the State of California, a statement of authorization, as described herein, or a power of attorney, as defined in chapter 5, General Board Hearing Procedures, is required. A statement of authorization must be in writing and must include the following information:
Note: Authority cited: Section 15606, Government Code; and Section 11651, Revenue and Taxation Code. Reference: Sections 741, 744, 747 and 11340, Revenue and Taxation Code.
1. New section filed 1-7-2008; operative 2-6-2008 (Register 2008, No. 2).