I wont do the whole thing but I will give you an idea of what I referring to.
The first thing is to remove any unwanted imagery from the original.
Align (outer edges) and overlay another image to the original. Reduce opacity.
Using the Pen Tool, create a template form the above step.
Reduce the templates opacity. The template is just for reference points later.
Using the Pen Tool or the Polygonal Lasso Tool, create or outline the section of building to the left. The color is sampled from the original and fill the outlined section with sampled color.
Repeat for the right side and the middle section.
I also placed a layer below the these for the light white lines of the triangle. Sample the light lines for color.
Once done, I combined the layers and added a mask to blend them to the original photo...
As I said, I won't finish this to completion, but you get the general idea!
I would just continue in this manner until complete. Don't forget to add details.
