IANAL, but it sounds to me that it no longer meets the definition of school under either the federal or state laws.
18 USC § 921 Definitions
(a) As used in this chapter—
(25) The term “
school zone[/font][/font]” means—
(A) in, or on the grounds of, a public, parochial or private school; or
(B) within a distance of 1,000 feet from the grounds of a public, parochial or private school.
(26) The term “
school[/font][/font]” means a school which provides elementary or secondary education, as determined under State law.[/font][/font]
(1) It is unlawful for a person to carry onto, or to possess on, public or private elementary or secondary school premises, school-provided transportation, or areas of facilities while being used exclusively by public or private schools: