Real property owned by a corporation or association
which is organized exclusively for bible, tract, benevolent, missionary,
infirmary, public playground, scientific, literary, bar association,
medical society, patriotic or historical purposes, or for two or more
such purposes, and used exclusively for carrying out thereupon one
or more such purposes either by the owning corporation or association
shall be taxable pursuant to the provisions of § 420-b of
the Real Property Tax Law.