Rooftop bulkheads, elevator penthouses, water towers, fire towers, hose towers, cooling towers, air-cooled or evaporative condensers, air-cooled or evaporative-cooled closed circuit coolers, exhaust fans or other air-conditioning or heating equipment, flagpoles, radio or television aerial, provided that such features and equipment are set back from the edge of the roof at least one foot for each one foot by which such features and equipment exceed the maximum height otherwise specified for the district in which they are located. Such features and equipment in the aggregate shall not occupy more than 10% of the area of the roof of a building, shall be consolidated into no more than two locations on the roof and shall be visually screened with a material compatible with the color and texture of the building walls or otherwise camouflaged.