California Corporations Code > Corp. Code §7340. Resignation or Expiration of Membership
(a) A member may resign from membership at any time, although the articles or bylaws may require reasonable notice before the resignation is effective.
(b) This section shall not relieve the resigning member from any obligation for charges incurred, services or benefits actually rendered, dues, assessments or fees, or arising from contract, a condition to ownership of land, an obligation arising out of the ownership of land, or otherwise, and this section shall not diminish any right of the corporation to enforce any such obligation or obtain damages for its breach.
(c) A membership issued for a period of time shall expire when such period of time has elapsed unless the membership is renewed.