There's a huge gulf between "single-occupancy houses" and "concrete jungles". Inner-city Paris is mostly apartment buildings and a far cry from a "concrete jungle" (despite being the highest-density western metropolis), Tokyo's outer special wards mix small appartment buildings and single-occupancy houses and are no "concrete jungles" either.

Just because you house multiple families in the same building does not mean you head straight for highrise central or ultra high-density concrete slabs.