Look, "available land" means "land that is not used". It is clear that more flexible zoning laws allows for easier re-use, if there are abandoned old warehouse

Look, "available land" means "land that is not used". It is clear that more flexible zoning laws allows for easier re-use, if there are abandoned old warehouses and other limitations (height of buildings) do not exist, then this may contribute to more availability and lower prices, but you need many, many converted old warehouses to make a dent in availability, and not necessarily large availability drives prices down. Differences in zoning laws have a relatively high impact in places where there is plenty of available, unused, land.