California Code, Corporations Code - CORP § 12702

Any subject corporation that existed on the first day of January 1873, was formed under the laws of this state, and which has not already elected to continue its existence under the prior law, may at any time elect to continue its existence under the provisions of this code applicable thereto, (a) by the unanimous vote of all its directors, (b) by the vote of the members representing a majority of the voting power of the corporation at an election held at any annual meeting of the members or at any meeting called by the directors for the express purpose of considering this subject, or (c) by action of the directors upon the written consent of the members representing a majority of the voting power of the corporation.

A certificate of the action of the directors, signed by the directors and the secretary, shall be filed in the office of the Secretary of State when the election is made by the unanimous vote of the directors or upon the written consent of the members.  A certificate of the proceedings of the meeting of the members when the election is made at any such meeting, signed by the chairperson and secretary of the meeting and a majority of the directors, shall be filed in the office of the Secretary of State.  Thereafter, the corporation shall continue its existence under the provisions of this code which are applicable thereto, and shall possess all the rights and powers, and shall be subject to all the obligations, restrictions, and limitations, prescribed thereby.