Why aren't more high-rise buildings using skygardens?
There are only very few examples: Commerzbank, Menara Mesiniaga, Darmala Building Jakarta, Kanchanjunga apartments and therefore does the well-being benefit to the people not outweigh the cost of the allocated space and maintenance, etc.?
Richard, I think you will find that roof-top type gardens have been around since "The Hanging Gardens of Babylon" in ancient Mesopotamia. the problem with highrise roof gardens is that the wind speed increases the higher you go, so that a skyscraper roof garden would need to be totally enclosed.
Plus roof gardens made in the 1930s on some of London's then "highrise" buildings needed walls or hedges on the boundaries of the space to cut down on the sideways wind effect.
Le Corbusier envisaged high level gardens at different levels on his highrise tower blocks, but again the sideways winds makes using such open level spaces not that pleasant to use.
The modern trend is to have multi-level water gardens in a totally enclosed atrium both for highrise office blocks and increasingly in lower level shopping malls.
You could say today's move away from the expressive outside design of architecture to inside design is a return to using caves as human habitats. Maybe architects who design these strange cave atria believe that in the future most humans will be living underground?