Willis Tower in Chicago, Illinois

grabcad

I visited the former Sears Tower in 1999 (Floor 103). Now I modeled and I offer it to anyone. You can read more about this impressive building on Wikipedia. I included here a picture from Wikipedia to suggest the concept of building. Actually, the base of building is a square of 3x3 cells. Each cell is 75x75 feet, and the height of cell is 4100 mm (ca. 13 ft 51/2 in). Try to model it and to render for yourself the construction.Enjoy!