Where is the world's largest building?

Question

I'm confused as to whether it is in Tokyo, Hong-Kong or Dubai.

Answer 1

The world's LARGEST building, by number of square feet, is the Pentagon.

The world's TALLEST building is currently the Taipei 101 tower in Taipei, Taiwan. (Although the Sears tower in Chicago is even taller if you include the height of the antenna, but that's kind of cheating, isn't it.)

However, the tallest building will be the Burj Dubai tower in Dubai, once it is completed. Until someone else builds one that's even taller.