Housing comes in 3 types (rectangular block zones, free zone, and individual zone), 4 wealth levels (Unqualified Workers, Qualified Workers, Executives, and Elites), and 3 densities (low and medium with the footprint of 40mx40m and high with the footprint of 60mx60m). By default all low density housing holds 1 worker, medium density housing holds 2 workers, and high density holds 5 workers. Housing is not always full so houses can have fewer workers than they have capacity.