Be designed for and occupied by not more than twenty-four (24) units per building, and shall be not more than one hundred ninety (190) feet in length in its longest dimension, without terminating or providing a ninety (90) degree angle, nor exceed fifty (50) feet in length without a change in façade architecture, including at least a twenty-five (25%) percent change in setback, facade color, texture, design, etc., to bring about a varied composition.