A typical two bedroom in Shanghai is $870k [1]. Homes in Chongqing China are more expensive than in Columbus Ohio [2] -- yet wages are about 1/5th ($9k/yr in Chongqing vs $46k/yr in Columbus) [3]
[1] http://fortune.com/2017/07/18/china-beijing-property-housing...
[2] https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou...
[3] https://www.statista.com/statistics/278350/average-annual-sa...
Also, earthquake protection makes SF based buildings more expensive to build, especially as they grow tall.
China has a massive housing imbalance. The skyscrapers are being purchased as investments by the newly rich and are out of reach to low/middle income folks. Also, not all those skyscrapers are good quality. In our condo on the 37th floor, we had to have the bathroom flooring completely redone because there were leaks all over the place. This building was built like 5 year ago! In addition, when you walk around the construction sites of those new skyscraper projects, you see those countryside workers crowded into hastily constructed dorms, 4 or 5 people in one tiny room. You can see them sitting around eating their small portion of rice and veggies. It is definitely a sight that would make most “living wage” Americans cringe...
My wife grew up in China and she loathes skyscrapers. We bought a single family home here in the USA with a nice size backyard and she has the happiest wife in the world. She often goes in our backyard just to sit and watch the squirrels. She also has a piano which she can play any time of the day. In China, neighbors complain when start playing your piano in those crowded skyscrapers....
I have an unproven hypothesis that most people on the planet would love their own single family home like we have here in the US. They aren't living in those dense urban areas because it is hip and cool. They are living there because they have no choice.
My guess is that if we re-zoned the Bay Area and replaced 1/4 of the current single family homes with 3-to-6-story apartment buildings we could cover several decades of regional housing demand and push housing prices down by 50%.