There is a formal definition of "skyscraper", which comprises a steel frame supporting curtain walls. Buildings below 100 feet never qualify in practice. Since

There is a formal definition of "skyscraper", which comprises a steel frame supporting curtain walls. Buildings below 100 feet never qualify in practice. Since half of San Francisco has zoning heights below 50 feet and even more onerous unit limits, it's safe to say that the housing supply could be radically expanded without any skyscrapers. For a general criterion, I think that double the local median building height would be a good line, though at least 3 stories should always be allowed anywhere with affordability issues.