California Code, Corporations Code - CORP § 1153

(a) After the approval, as provided in Section 1152, of a plan of conversion by the board and the outstanding shares of a corporation, the converting corporation shall cause the filing of all documents required by law, including, in the case of a corporation converting into a foreign corporation or foreign other business entity, the laws of the state or place of organization of the foreign corporation or foreign other business entity, to effect the conversion and create the converted entity, which documents shall include a certificate of conversion or a statement of conversion as required by Section 1155, and the conversion shall thereupon be effective, or, in the case of a corporation converting into a foreign corporation or foreign other business entity, shall be effective in accordance with the laws of the state or place of organization of the foreign corporation or foreign other business entity.

(b) A copy of the statement of partnership authority, certificate of limited partnership, or articles of organization, or certificate of conversion complying with Section 1155, duly certified by the Secretary of State on or after the effective date, is conclusive evidence of the conversion of the corporation.