How would you design/build a permaculture city?

I know this is a big topic, but stick with me.

This is just for brainstorming and dreaming purposes. Everything starts with ideas.

Let’s say that you had 50,000 square miles to work with (about the size of the core of Seattle). And let’s say demand for living there was an assumed given.

In your area (or in mine, the PNW):

What materials would you build out of for housing?

What options would you favor for public transit?

Would you build underground to save surface space, or do green roofs?

What kind of industries do you think would be feasible for supporting people financially?

PNW - the first factor I'd plan for is Earthquake proof. We're going to have many people who will be homeless if the Cascadian Subduction lets go, so lets make sure any new housing can cope. If that means taking lessons from the Japanese, let's do it. If it means we can't be totally permie, I'll accept that because the current option is a lot of embodied energy in houses that will be wasted because we know they will only "save lives", not "survive the shaking and still be safe housing".