Are skyscrapers in the US mostly fully occupied or are many floors empty?

There are many skyscrapers in the US, especially in cities like New York, Chicago, or Miami. Many of them feature the logos of large corporations, suggesting they serve as headquarters. But I wonder: Are these buildings really almost fully occupied, or are many floors empty? Besides, when I imagine how many people could theoretically work…

What is the architectural difference between Chicago and New York City?

Hello, When I compare the cities of Chicago and New York City in terms of construction, I admit that they do have a certain similarity. Chicago New York City What might be the biggest differences between Chicago and New York City from an architectural point of view? PS: Please no troll or joke posts!