The 20k figure would be referring to the development, which would be several "blocks" (i.e. independent buildings crammed next to each other). The average hous

The 20k figure would be referring to the development, which would be several "blocks" (i.e. independent buildings crammed next to each other). The average household size is still 3 (bit lower in public housing) with average living space per person of ~140 square feet. Keep in mind that those 140 square feet are measured based on the outside of the building!