The purpose of this article is to subject certain
real property, heretofore partially or wholly exempt from taxation
and hereinafter specified, to the imposition of service charges and
special ad valorem levies and special assessments as the same are
defined in the Real Property Tax Law and as authorized by §§ 400
and 420 of the Real Property Tax Law, such sections being added thereto
by Chapter 417 of the Laws of 1971.