Good points. I'm curious if there's anywhere world-wide that's tried land swaps on a large scale. Maybe Japan? In the sense of "I give you my house + lot (and

Good points. I'm curious if there's anywhere world-wide that's tried land swaps on a large scale. Maybe Japan? In the sense of "I give you my house + lot (and my neighbors do), you give me back X units in the more dense development you replace them with." I read on an article here that China does something similar, but that was more geared around transit right of ways and farmland, vs increasing density in low density urban areas. As you pointed out, California seems like it needs a carrot and a stick. A carrot, to financially incentivize existing homeowners to be part of the solution. And a stick, to discourage the worst tendencies of sit-on-it-forever.