Sayami - u too an engineer/architect? For your information, Taipei 101 is the tallest building in the world amongst the one that actually exist. Amongst projects in pipeline, South Korea is planning one that would be around 120 metres (as far as I can recall) taller than Taipei 101 somewhere in an island in the eastern coast but it would be way-way wider and spacious as the foundation conditions will require it to be more-or-less of a pyramid type. It had been talked about in a conference some time ago although now I searched a lot but still could not find any link to it. On top of that, the tallest building in the world is actually going to be constructed, and is in the design stages now, in Noida, Uttar Pradesh, India . Given the fact that it will be 710 meters tall (and taller by good 200 metres over the current tallest building in the world), it will definitely hold its crown for a good deal of time. The proposed NT building in Nepal, I guess, could still likely compete based on the "top of the building from Mean Sea Level" but not from the "height of structure from the foundation bed". Or maybe they can still make a building in Solukhumbu if they really are going for a game. Links of the Noida, UP building in India, - http://www.guardian.co.uk/international/story/0,3604,1447712,00.html and - http://www.projectsmonitor.com/detailnews.asp?newsid=8951 Keep building...