I'm siting here pondering how adding a second stairway to a building makes it economically unfeasible. What kinda crappy buildings are you making where the stairway is that substantial to the cost of the construction?

And in low rise buildings, there's usually a LOT of stairways lol. A typic suburban US apartment complex has a half dozen buildings, and each one has maybe 12 apartments and like 4 stairways.