Building height limit: 45 feet, measured as required by the definition of "building height" in this chapter. However, if the applicant provides certifications from the Harrington Park Fire Department, the Harrington Park Ambulance Corps, and the Harrington Park Police Department, that provisions have been made to permit them to adequately and fully service these buildings (especially during emergencies), the building height limit shall be 70 feet measured in the same manner as described above. In the case of the Fire Department, the certification must affirmatively state that, and describe how, they can both fight a fire on the top floor of the building and rescue people from upper floors if normal means of pedestrian egress are not available. All buildings except for accessory buildings shall have a minimum height of 15 feet. All roofs shall be free of towers, portable equipment, outdoor storage, stacks and the like. All roofs shall have no accessory structures located thereon other than vents, cupolas, elevator towers, chimneys, HVAC equipment or ventilators, all of which shall be properly screened from off-site views. It is the intention of this provision to prevent the impairment of views, as well as the obstruction of the passage of light and air.