When I went home to Chicago, I took some photographs of the city where we could potentially place our project. Though I've taken photographs around other locations in downtown, the images in Millennium Park seemed the most fitting. The photos seen below are in the Chase Promenade North, where there's large amounts of empty space (Cloud Gate is close by).
these are yet to be edited...
Below is a vector rendition of the structure
The measurements of the overall form is 30' by 30'. The cylinder in the middle is 20' x 20'.
Here are the other photos of large, expansive spaces in downtown Chicago: