A rooming house, also called a "multi-tenant house", is a "dwelling with multiple rooms rented out individually", in which the tenants share bathroom and kitchen facilities. Rooming houses are often used as housing for low-income people, as rooming houses (along with Single Room Occupancy units in hotels) are the least expensive housing for single adults. Rooming houses are usually owned and operated by private landlords. Rooming houses are better described as a "living arrangement" rather than a specially "built form" of housing; rooming houses involve people who are not related living together, often in an existing house, and sharing a kitchen, bathroom, and in some cases a living room or dining room. While there are purpose-built rooming houses, these are rare.