Yard (setback), side: none required, except if interior windows are provided, it shall be not less than 15 feet wide. When the lot adjoins a lot in a residential zone along its side lot line, and provided that such adjacent lot has not been recommended for the C-O Zone or a general or sectional proposed zoning plan duly adopted by the Town, there shall be a side yard having a minimum width equal to the height of the adjoining office building zone structure, but not less than 25 feet. At least 10 feet of this side yard shall be planted as a screen using suitable materials as approved by the Town. On corner lots, the side building line shall be the same as the front building lines of the majority of lots fronting on the same street, except that the side building line shall be no less than 50 feet from the center line of an abutting street or highway. All side yards shall be landscaped.