Any person who violates § 18.2-46.2 (i) upon the property, including buildings and grounds, of any public or private elementary, secondary, or postsecondary school or institution of higher education; (ii) upon public property or any property open to public use within 1,000 feet of such school property; (iii) on any school bus as defined in § 46.2-100; or (iv) upon the property, including buildings and grounds, of any publicly owned or operated community center or any publicly owned or operated recreation center is guilty of a felony punishable as specified in § 18.2-46.2, and shall be sentenced to a mandatory minimum term of imprisonment of two years to be served consecutively with any other sentence. A person who violates subsection A of § 18.2-46.3 upon any property listed in this section is guilty of a Class 5 felony, except that any person 18 years of age or older who violates subsection A of § 18.2-46.3 upon any property listed in this section, when such offense is committed against a juvenile, is guilty of a Class 4 felony. Any person who violates subsection B of § 18.2-46.3 upon any property listed in this section is guilty of a Class 4 felony. It is a violation of this section if the person violated § 18.2-46.2 or 18.2-46.3 on the property described in clauses (i) through (iii) regardless of where the person intended to commit such violation.