Housewife May and her three children were overjoyed last September when they moved into a 200 sq ft subdivided flat in Kwai Tsing, a Hong Kong district with one of the city’s lowest average monthly household incomes. For years, the 50-year-old single parent had lived in a squatter hut with her son and two daughters, where they had to climb hundreds of stairs daily. They later moved into a 100 sq ft subdivided flat before securing their current place. Located on the 15th floor of a lift-equipped...