Andrés Duany makes a good case for considering density at the scale of the neighborhood rather than the individual building. He states that the types listed above, in the context of a neighborhood reflecting the average United States market for need and choice results in roughly thirds: or one acre of apartments per two acres of townhouses per four acres of single family houses. This delivers a net density of 10 units per acre for a complete neighborhood. Next time you’re faced with a frightened crowd of density opponents, try turning the conversation to types of buildings, and allow that discussion to evolve into addressing the neighborhood as a whole, rather than simply a sum of its individual parcels.
— –Susan Henderson