How do I know what is common area?

Typically, common area is the entire development or project except the separate interests. It is not the same in every condominium project or planned development and it is not possible to know what is “common area” and what is “separate interest” just by looking at the project. It is necessary to look at the CC&Rs and sometimes the condominium plan, if any, to determine the boundaries of the separate interests and the common area.