^completely depends on the materials and engineering.
Generally speaking a concrete residential highrise is 7-8" slabs, office are 9-10" and hotels somewhere in between.
Anticipated loading requirements also play a part and change these numbers.
Parking slabs are thicker, up to 12" but have far more rebar.
however, it depends on column spacing and the such as well
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"The destructive effects of automobiles are much less a cause than a symptom of our incompetence at city building" - Jane Jacobs 1961ish
Wake me up when I can see skyscrapers
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