I'm glad you pointed this out. I've had this thought floating around in my head for a long while. The only affordable high-density cities I can think of are in

I'm glad you pointed this out. I've had this thought floating around in my head for a long while. The only affordable high-density cities I can think of are in Thailand, Africa, and maybe Eastern Europe? I think NYC is our best comparison though... it's actually much more expensive per square foot to buy in Manhattan than it is in SF, and the rental prices are approximately the same.