Skyscrapers seem a waste and vulnerability compared to the traditional 10 story style brick, or preferably stone, buildings typical in cities before skyscrapers. Some are bigger than 10 stories, and they can be built earthquake safe same as skyscrapers, the first earthquake safe designs of which that I'm aware of happened after the San Francisco area earthquake some time around the turn of the 20th century that leveled the large buildings. But I'm sure there were prior methods probably dating to antiquity in the middle east and elsewhere.

One method was to build a sort of pool over the build area, a solid container, with sand and the like inside, and building on top of that, vibrations would be absorbed by the sand. There are other methods too but they can be employed by both skyscrapers and masonary buildings.

As to size, the city hall building in philadelphia is the larges I believe, a magnificent building, with statues at levels going up with William Penn at the top. Ornate and decorative too, very unlike the brutalist architecture of today's city leaders. Compare the subway of any european capital city, from moscow to paris, to new york or DC's subway. Our leaders have no style, all the money for overinflated contrancts, and more money than any, but none for style or art built into it.