The provisions of section R.S. 54:4-3.6 shall not be construed to disallow a college, school, academy, or seminary which is accorded exemption from taxation as a nonprofit organization under the section from leasing a building or a portion thereof, or a portion of its property which is regularly utilized for tax exempt purposes, to an organization or business during seasonal periods when such building or property is not being utilized by the college, school, academy or seminary in furtherance of tax exempt purposes, provided that:
N.J.S. § 54:4-3.6d