There are very rapidly diminishing returns to that. As soon as you add just one more floor, you lose a lot of space to stairs. Then you need a stronger foundati

There are very rapidly diminishing returns to that. As soon as you add just one more floor, you lose a lot of space to stairs. Then you need a stronger foundation, pipes have to push water up farther so those systems need to be reinforced and the walls need to be stronger. Add a third floor and the costs go up a lot more. Once you are into the really big buildings, say skyscrapers, it's not unusual that 40% of the area is taken up by elevators, HVAC systems, supporting infrastructure. Looking at industry data, e.g. https://ccorpinsights.com/costs-per-square-foot/ https://ccorpinsights.com/costs-per-square-foot/ we can see that construction costs per livable square foot go from $300 for single story to $600 for midrise to $800 for highrise.