London-bases architecture firm Chetwoods won the bid to build some massive buildings in Wuhan, China. They call the creations the Phoenix Towers. The taller of the two towers is planned to be one kilometer high, which comes out to 3280 feet in something that you can wrap your head around.
The two Phoenix Towers, which will take up 750,000 square feet of floor space, will rise from a 47-hectare plot on an island in the middle of a lake, and have excellent environmental credentials. The tallest tower will contain filtration systems that will clean both the water in the lake and purify the surrounding air, as well as solar energy panels on the side that will feed power to a solar plant.
It says there is 750,000 square feet of floor space, but looking at this image it seems to me like the usable space will be pretty minimal compared to the total space of the building. Someday I hope to visit it and critique it in person.