Building codes prohibit this in many places, i.e. the taller the buildings, the more free space is required between them (for light, safety etc.). https://en.wi

Building codes prohibit this in many places, i.e. the taller the buildings, the more free space is required between them (for light, safety etc.). https://en.wikipedia.org/wiki/Floor_area_ratio https://en.wikipedia.org/wiki/Floor_area_ratio