The average U.S. housing costs $240,000. But in San Francisco, a two-bedroom apartment costs around $750,000 to build. The costs of construction in SF are 13% higher than in New York, 60% more expensive than Chicago, and 75% more than in Houston. But why is it SO expensive? For starters, the price of land and labor in California is insanely higher than other states. In SF, a construction worker...