A builder floor apartment is a residential unit in a low-rise independent building that has a few other flats. The number of floors is generally two-four. Such a floor can be developed by the builder on its own or in collaboration with the land owner. It is a section of a villa.
A slum is a highly populated urban residential area consisting mostly of closely packed, decrepit housing units in a situation of deteriorated or incomplete infrastructure, inhabited primarily by impoverished persons.It is a part of the city where the housing quality is bad and living conditions are poor.