Buildings that are three stories or taller and wider than 30 feet shall be designed to differentiate the ground floor, middle body (i.e., all of the floors between the ground floor and top floor or cornice/parapet cap), and the top floor or cornice/parapet cap. Each of these elements shall be distinguished from one another through the use of all of these techniques: variation in building modulation for a minimum of 70 percent of the length of the facade through changes in wall planes that protrude or recess with a minimum dimension of three feet; variation in facade materials through the use of at least two of the following: size, texture, pattern, or color; and variation in fenestration, through the following: incorporating a step-back, recession or projection with a minimum depth of three feet, and a change in surface area occupied by windows, doors, balconies, or trim by a minimum of 15 percent.