I had lived in this kind of appartment when I was a child.
A 10-metre-square appartment usually housed a family of 4 to 6.
The rent was about HK$14 (US$1.8) a month
but the monthly average family income was HK$150 (US$19) at that time.
A private kitchen, a bathroom and even a water tap were considered luxuries.
Instead, public facilities were available on each floor.
Foreign tourists visiting the apartment complexes referred to them as "prisons".

As the living standard improved, this kind of 7-storied building
is gradually replaced by bigger and modern housing estates.
Because the government is going to demolish Shek Kip Mei Estate,
resettlement estates will be vanished in the coming years.