Paul-
The unfinished box is the prototype of the building’s stair box. The actual building is about 800 feet long and has several stair boxes along the street-side elevation. The real stairboxes are 3 window columns wide- I made it at 2 window columns wide so it would not overwhelm the main elevation. The footprint of Downtown Building #1 is 9” square. The first floor is recessed to the same depth as the top floor.