CERTAIN APARTMENT is a term used to describe a variety of living arrangements. A COOP is a type of apartment building owned by a corporation or association, where the tenants own shares in the corporation that owns the building. A SUBLET is an arrangement in which the tenant of a rental property subleases all or part of the property to another person. Lastly, a LOFT is a large adaptable open space, often converted from an industrial building, which can be used as a living or working space.