A rooming house, also called a "multi-tenant house", is a "dwelling with multiple rooms rented out individually", in which the tenants share kitchen and often bathroom facilities. Rooming houses are often used as housing for low-income people, as rooming houses 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 a living room or dining room. Rooming houses in this way are similar to group homes and other roommate situations. While there are purpose-built rooming houses, these are rare.