 If the buildings in this layout were detached houses, they would be priced in the top range of the market.But instead, the buildings are divided into 2, 3, 4 or 6, creating duplex, triplex, quadruplex or sextuplex units.As the buildings are divided, the land area and the built-up area become smaller; the number of units in the layout and the density of the development go up to rival that obtained in terrace house developments.