Building beyond a few floors gets a lot more expensive than several shorter buildings, both to build and to maintain. You gotta lift all the construction materials and workers, you gotta make foundations and lower walls a lot stronger, you need more floor space for stairs and elevators. You need extra pumps for water, and wastewater pipes need “steps” because a poop that falls down 20 floors can do some real damage.
Once the building is made, you need more energy to run the elevators and to pump water up.
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