Single room occupancy (more commonly abbreviated to SRO) is a form of housing that is typically aimed at residents with low or minimal incomes who rent small, furnished single rooms with a bed, chair, and sometimes a small desk. SRO units are rented out as permanent residence and/or primary residence to individuals, within a multi-tenant building where tenants share a kitchen, toilets or bathrooms. SRO units range from 7 to 13 square metres (80 to 140 sq ft). In some instances, contemporary units may have a small refrigerator, microwave, or sink.