The term “Common Interest Development” (or “CID”) describes a form of real estate. This is where each owner holds exclusive rights to portions of the property called a unit or lot, and shared rights to portions of the property called the common area or common elements. The most numerous forms of CIDs are the condominium and the planned development. The two other types of CIDs, the stock cooperative and the community apartment, are far less common and are not discussed here.