3. Bullitt Center, Seattle
Not all futuristic buildings look like something out of a science fiction movie. In fact, some are futuristic based on their function more than anything. The Bullitt Center is one such building. It does involve a lot of mirrored glass, but the real magic is what happens inside and around it.
The office building is energy and carbon neutral, using a green roof to filter gray water and rain. Solar panels power the entire six floors of the building and a rainwater capture system on the roof makes this building nearly sustainable.