Building height, including parapets and roof surfaces, but not including roofscape features, mechanical equipment, elevator shafts, chimneys, vents and stacks, rainwater-harvesting structures, limited recreation or building amenities, and the like, shall not exceed 54 feet. When the side of a building is adjacent, in whole or in part, to other districts or streets or alleys that abut other districts, an outside wall over 42 feet in height, including parapets, mechanical equipment, minor roof surfaces, other minor structural elements, elevator shafts, chimneys, vents and stacks, and the like, but not including roofscape features limited recreation or building amenities, must be at least 10 feet behind the face of the outermost wall below it (averages may be used for irregular surfaces). In all cases, the height of mechanical equipment, elevator shafts, chimneys, vents and stacks, and the like, shall be minimized, screened in an aesthetically appropriate manner, and hidden from street view and adjacent buildings of equal or greater height as much as possible. All mechanical equipment, elevator shafts, chimneys, vents and stacks, and the like shall be fully screened from all vantage points, including the street and adjacent buildings of equal or greater height, in a manner compatible with the architectural style of the building. The screening shall not impair the functioning of the equipment. Individuals and parties undertaking construction or renovation projects may consider a more detailed roofscape plan that includes visually appealing elements that screen mechanical equipment while incorporating limited recreation or building amenities, including green roofs and rooftop gardens, patios, terraces, and decks.