I suspect not being surrounded by other buildings helped. In my own experience of having helped get a building built, it was made clear to me that logistics is a huge component of the process. Here you can see that the identical nature of the floors allows for teams to work in parallel. While floors are added above, the interior is worked on below.
Now they want to build the world’s tallest building in just 90 days.
BSB chief executive officer Zhang Yue (张跃) said the company plans to break ground on Sky City in November 2012, and that the tower will be completed in January 2013.