So it starts dropping in 04-05 and really slides off a cliff in 09-10 and never recovers. The worst year on record for under 400k unit construction was last year, and it's not the worst year on record for total unit construction by a long shot. Meanwhile the top-end stuff picks up in 2011-2012 and has never been higher than last year. Seems to me like a reasonable hypothesis to guess something changed and it had to do with the great recession.
They are bigger. You're right about that. But that has been trending up at a constant rate since about '85, largely because the top end was getting that much bigger, so I think the high-end is really skewing the averages. And, of course, when you're building 80% high end, is it the chicken or the egg? It might be a game of maximizing relative to lot cost. But why the sharp change over the last decade? Why weren't they maximizing the same way in the early aughts? I admit, I don't got all the answers here. The data just suggests to me that there's something more than just zoning and building codes at play. Maybe a lot of somethings.

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