If a psychiatric hospital is owned and maintained by the county, and it becomes necessary either to enlarge the hospital by the building of additions or extensions, or to erect additional buildings for the accommodation of the patients, the board of chosen freeholders or governing body of the county may, upon a resolution or ordinance, as appropriate, to be adopted by the affirmative votes of two-thirds of the full authorized membership of the board, build additions, extensions, additional building or buildings, and properly fit, furnish, and equip them.
N.J.S. § 30:9-4