Developers just build places for people to live and work. Like the house you live in. They could build a lot more in places like San Francisco and Palo Alto.

Developers just build places for people to live and work. Like the house you live in. They could build a lot more in places like San Francisco and Palo Alto. Yes, it's a bit more expensive, but that's a pretty minimal component of the price at 2/3/4 stories. The real problem that prevents building up and in is rampant NIMBYism.