The provisions of this chapter shall apply to all land and all owners of land within the incorporated limits of the city and shall be applicable not only to private persons, agencies, and organizations, but also to all public agencies and organizations to the full extent that such provisions may now or hereafter be enforceable in connection with the activities of any such public agency or organization. In their interpretation and application, the provisions of this chapter shall be held to be minimum requirements. (Amended during the March 2009 supplement.)