Proposed changes in exterior architectural features shall be in harmonious relationship to the remainder of the structure and to the surrounding area. Unity and compatibility with adjacent structures is to be achieved to the maximum extent possible. Areas of review shall include the scale and general size of the structure or structures in relationship to the existing surroundings, specifically, the structure's overall height, width, street frontage, number of stories, roof type, facade openings (windows, doors, etc.) and architectural details.