Corp. Code, § 9925

When any corporate agent for service of process has been designated prior to January 1, 1980, and such designation of agent included a name of a city, town or village wherein the corporate agent maintained an office, service on such agent may be effected at any office of the agent set forth in the certificate of the corporate agent filed pursuant to Section 6213 of the new public benefit corporation law (applicable to public benefit corporations and, subject to Section 9660, to religious corporations), Section 8213 of the new mutual benefit corporation law, Section 1505 of the Corporations Code, or filed pursuant to Section 3301.5, 3301.6, 6403.5, or 6403.6 of the Corporations Code as in effect prior to January 1, 1977.