I agree with you about the mortgage interest deduction. I'm not saying renters have outsized political power; they have, more likely, undersized political power. I'm saying very narrowly that in the market for multifamily building construction, people that need more bedrooms are an important market force, one the market has to pay attention to.

The whole 1bdr vs. 3bdr thing is a total sideshow; the actual issue, again, is SFZ.