Take 10,000 hideous plain beige detached houses. Replace 2000 with 20 big buildings. 2000 with 200 small buildings, 2000 with row houses, 2000 with duplexes and

Take 10,000 hideous plain beige detached houses. Replace 2000 with 20 big buildings. 2000 with 200 small buildings, 2000 with row houses, 2000 with duplexes and quadplexes and leave 2000 as houses (but remove the hoa). Now they can all look at a large park, and still only take up half the space.