I don't think that's true at all. Do you have data to support it? Everything I've seen indicates that most large cities do have a significant percentage of vaca

I don't think that's true at all. Do you have data to support it? Everything I've seen indicates that most large cities do have a significant percentage of vacant land ( https://www.tandfonline.com/doi/abs/10.1080/13574809.2016.1167589 https://www.tandfonline.com/doi/abs/10.1080/13574809.2016.11... ) and that cities like Seattle, SF, NYC, etc are indeed unique in their geographic constraints and total land utilization. What I'm really talking about what I say "geographically constrained" is the elasticity of housing supply. Cities like Seattle, SF and NYC have less elastic housing supply in part because of their current land utilization and geographic constraints hemming in new development. That's a pretty well understood phenomenon.