This is a fantastic example of what you can do with a limited budget, but lots of time and ingenuity.
The photographer knows his way around the following things:
- permits, and dealing with multiple building owners/city departments
- small (but powerful) light kits and generators
- a good working team of assistants
- Photoshop, to stitch them all together
What is wonderful about this is that everything he did could have been accomplished in one single shot, but it would have been much more expensive to pull off. This way, you get the money shot, but with much less money.