Your story may be apocryphal. I live in Peru and the unfinished aspect is rather the result of the extended period (we are talking years) it takes poor families to build their houses and also from the fact that the vertical growth of the house reflects the growth of the family: the children as they become adults build and live on the second floor, the grandchildren on the third etc. These houses are always getting upgrades as the families grow and round up money and therefore are never finished. You can always see the metal rods sticking out of the cement columns because they always plan to add another floor. (Housing in Peru is mostly built on cement and bricks, except the poorest people, because of earthquakes).