Zones are planned building plots that are empty at first but then populated by buildings depending on the type and density of the zone. Areas of land can be zoned as residential, commercial or industrial areas in various densities where the city will begin to grow. Agriculture is a separate industrial zone-type, unlike previous versions of "SimCity", enabling farms to grow regardless of high land value, so long as demand exists for agriculture and agricultural zones have been provided. Zones are now automatically aligned towards roads and most buildings must be adjacent to a road in order to function properly; streets are automatically created when zoning on large tracts of land.