About two years ago Chad Oppenheim Architecture + Design announced plans for COR, a revolutionary green high-rise in the Design District. The building would incorporate wind turbines, photovoltaic panels, and solar hot water generation, and feature a hyperefficient exo-skeleton. It was originally supposed to be finished by 2009. Well, not much has happened with it since they released the breathtaking 3-D renderings, but it's still on its way, hopefully.
Inhabitat says, "The project is still on-the-boards but facing delays."
Right now probably wouldn't be the best time to search for tenants for a 25-story building anyway, but it'd be a shame if the project didn't come to fruition. It was one of the few projects that had us excited. Oppenhiem's website lists a new estimated completion date of 2011, so there's hope.