The green glass look seems to have evolved from HM's 10th and Market design. I hope there are not too many more look alike colors and textures in towers in San Francisco. Skylines look much more interesting and dynamic with greater varieties of height, color, materials, shapes and design. It is great that San Francisco is finally getting away from the light colored pastel, non-glass look that has typified the city for most of the 20th century, but too much similar green glass is not so good either.
For those of us Trekkers, Trekkies and SF skyscraper fans out there, look here:
http://www.st-v-sw.net/STSWcities-sanfran.html
The Towering Inferno movie was written and filmed in the early 1970's, when many thought San Francisco was heading towards being one of the greatest skylines in the world. This was about the same time protests against tall buildings in San Francisco was also at its most active. It is interesting that the gap between fantasy and approximate reality is taking about 40 years (1974-2014), or about the same time it is taking for many of those former protesters to reach retirement age.