A cooperative apartment house, also known as a co-op, is a housing arrangement where residents own shares in the building and have the right to live in a specific unit. Some synonyms for cooperative apartment house include co-op apartment, co-op building, cooperative housing, shared-ownership housing, and mutual housing. Each of these terms refers to a housing model that emphasizes shared ownership and decision-making among residents. Whether it's a co-op apartment or a shared-ownership housing project, the focus remains on creating a sense of community and shared responsibility among residents while offering affordable homes in urban areas. Ultimately, the term used may vary based on location and cultural context, but the underlying principles remain the same: cooperative living and shared ownership.