Volgus, actually I had mentioned having an observation deck in the base of the spire way back on page 6 of this thread.
Regarding LEED certification:
A building designing can be “scored” it as it relates to the LEED certification. The highest score you can get is 69 points. The certifications work like this for new construction:
LEED certified: 26 – 32 points
LEED Silver certified: 33 – 38 points
LEED Gold certified: 39 – 51 points
LEED Platinum: 52 – 69 points
A building can obtain points based on things like renewable energy, passive and active solar design, photovoltaics (converting light into electricity) and other technologies.
Passive solar design is used to sustain a comfortable building temperature during the entire day regardless of where the sun is. This science is a bit more detailed then you would normally think. For example, the technology used to make the ACC LEED certified in Philadelphia may be quite different then the technology used for the same building in Miami, or Las Vegas. Positioning, placement, size, normal climate temperature all go into this.
For those that are interested, here is a cool link that explains how the use of concrete can add to obtaining LEED certification. It includes some detailed links that explain some more about the point system. It is very interesting reading.
I think that the Comcast building may the tallest LEED certified building in the US. The American Commerce Center would certainly be among the tallest LEED certified buildings globally but I do not know where it would place. It would be interesting to see something like a top 10 tallest LEED certified buildings. Anyone? Anyone?