On a corner lot in any O-MR Office Mid-Rise Zone District, nothing shall be erected, placed, planted or allowed to grow in such a manner as to materially impede vision between a height of two and one-half (2 1/2) feet and 10 feet above the center-line grades of the intersecting streets in the area bounded by the street lines of such corner lots and a line joining points along said line 30 feet from the point of intersection, nor shall a principal structure be located less than 20 feet from the side street line. All sight rights, where applicable, shall be subject to County of Bergen and Department of Transportation approvals.