Whenever any structure is proposed to be erected, enlarged or altered on any property in any residence district or in the business district to be used for a permitted institutional, either conventional or limited-income multi-unit residential, public utility, park, playground, private recreation club, agricultural, horticultural, municipal use or conditional use, a site plan shall be submitted to the Planning Board which shall conduct a hearing thereon as provided by law, and no construction permit shall be issued prior to Planning Board approval of the site plan.