The taller the building the deeper (and more expensive) the foundations, as it needs to hold up more weight.
The type of soil also affects how high a building can go.
Also, in a lot of countries there are rules about how many floors you can have without lifts (eg in HK, you can have stairs if there are 5 floors, but 6 and over needs to have lifts). This makes it more expensive to build and maintain.
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