Is There A Limit To How Tall Buildings Can Get?

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The Burj Khalifa in Dubai is 828 meters tall. Bold builders in China want to go 10 meters higher later this year with a 220-story pre-fab tower that can be constructed in a baffling 90 days. And then, in 2018, the Kingdom Tower in Jeddah, Saudi Arabia will go significantly farther, with a proposed height of at least 1,000 meters.
Will this race ever stop? Not in the foreseeable future, at least. But there has to be some sort of end point, some highest possible height that a building can reach. There will eventually be a world's tallest building that is unbeatably the tallest, because there has to be an upper limit.