5000 people per square kilometer is only 20 people per acre, and any standard rowhouse neighborhood has 14 lots per acre, so this is only 1.4 people per house,

5000 people per square kilometer is only 20 people per acre, and any standard rowhouse neighborhood has 14 lots per acre, so this is only 1.4 people per house, a much lower density than you would get with large families or with multistory apartment buildings. A lot of cities that fail to meet this density are only because their legal limits also include a lot of essentially undeveloped land as well.