sky scrappers are nothing but just a work around or an easy fix to problems faced by major cities like Mumbai or may be Shanghai where population is increasing but due to scarcity of land proportionate new houses can not be made available causing high property prices!
sky scrapper may be a good option but can be dangerous at time if local municipality is not equipped with sophisticated and quick reaction technology and equipment to deal with natural or man made calamities like earth quake, fire, bomb blast etc....with power responsibility increases...!