I would imagine so, but I'm no engineer, obviously. So I'd be more than happy to see the standards spelled out in the future, in code. And there's differences in "green" roof systems to consider as well. An extensive roof has a different characteristic than a intensive one. I'd think that the only way any kind of green roof on Cobo is an extensive one.

Here's a good PDF laying out certain restrictions if you are interested.
http://www.cityofberkeley.info/uploa...f%20System.pdf