The study, reviewing slums and regulation of slums Lagos, Nigeria. Seventy percent of Lagos’ population lives in slums. And although slums exist in most large urban centers of the developing world, Lagos’ situation is unique, not least of all because of the massive numbers of the megacity’s 15 million-strong population that lacks housing and basic services, but also because many of these slum settlements are not upgradable. Also, the scale of disparity between the rich and the poor, the haves and the have-nots, the formal and the informal, is evident not just from the physical urban form of the city, but also the fact that much of the middle-income households cannot afford to buy a house in the city.