Putatively for safety reasons - to facilitate evacuations. Furthermore, this is why the LA skyline is rectangular and flat-topped in result.
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TIL that for fourty years, until 2014, Los Angeles *required* buildings above a certain height to install a helipadhttps://www.google.com/amp/www.latimes.com/local/cityhall/la-me-skyline-roofs-20140930-story,amp.html …
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I assumed this was a requirement in Tokyo too but apparently those are all voluntary:https://www.bloomberg.com/news/articles/2016-05-19/why-tokyo-has-the-most-rooftop-helipads-and-doesn-t-use-them …
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As VTOL flight becomes cheaper and ubiquitous, this may be seen as genius.
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It's 10 years away, and has been for a century.
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Almost there...
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