There is only so much land where people actually want to live. Governments put restrictions on what can be built. It might end up costing $20 to build a 100-story apartment complex, but if the government says buildings can only be five stories high or you have to only build single family homes it doesn't matter.
> It might end up costing $20 to build a 100-story apartment complex, but if the government says buildings can only be five stories high or you have to only build single family homes it doesn't matter.
And that's the point. The problem isn't caused by automation, it's caused by zoning restrictions.