[ttflee]

It could be a design and what you were missing is a glass facade that would align its missing symmetry.

[sct202]

This would make sense based on this picture : https://upload.wikimedia.org/wikipedia/commons/1/14/Tencent_... There are a lot of angled windows on one side that would be awkward looking without the facade.

[tim333]

Here's a photo of the thing pre facade http://2016.ctbuh.org/wp-content/uploads/2016/03/Tencent1.jp...