View from the tallest building in the Western Hemisphere

Here's another one from Rajneesh, thanks again boss !!

The location is the same- Sears Tower, the view is different. They say you haven't seen Chicago if you have not been here, what a building !!!

Here's the link to purchase tickets online for the observatory
http://www.theskydeck.com/

An old one - why is it a building when its already built ?