Living quarters are structurally separate and independent places of abode. They (a) may have been constructed, built, converted or arranged for human habitation, provided that they are not at the time of the census used World Health Organization [WHO]lly for other purposes and that, in the case of non-conventional housing units and collective living quarters, they are occupied at the time of the census; or (b) though not intended for habitation, were in use for such a purpose at the time of the census [Department of Economic and Social Affairs [DESA]]