How did large old mansions in central Lima become crowded inner-city housing?

Since the 1930s, the former residential zone of central Lima has undergone significant modifications, leading to the transformation of spacious colonial-era mansions into crowded inner-city housing.1

As wealthier residents moved to suburban areas like Miraflores, these large mansions were subdivided to accommodate as many as 50 families each. These densely populated areas, known as tugurios, corralones, or callejones, became primary housing for immigrants arriving from the countryside who were seeking to establish themselves in the city's economy and society. Consequently, these zones often suffer from very poor sanitary conditions.12