“School building” as used in this article means and includes any building used, or designed to be used, for elementary or secondary school purposes and constructed, reconstructed, altered, or added to, by the state or by any city or city and county, or by any political subdivision, or by any school district of any kind within the state, or by any regional occupational center or program created by or authorized to act by an agreement under joint exercise of power, or by the United States government, or any agency thereof.