(a) No person, by means of fire or explosion, shall knowingly cause or create a substantial risk of physical harm to any Park District property without the consent of the Park District.
(b) (1) No person, by means of fire or explosion, shall knowingly cause or create a substantial risk of physical harm to any structure of another that is not an occupied structure;
(2) It is an affirmative defense to a charge under subsection (b)(1) of this section that the defendant acted with the consent of the other person.
(ORC 2909.03)