California Code, Civil Code - CIV § 4145

(a) “Exclusive use common area” means a portion of the common area designated by the declaration for the exclusive use of one or more, but fewer than all, of the owners of the separate interests and which is or will be appurtenant to the separate interest or interests.

(b) Unless the declaration otherwise provides, any shutters, awnings, window boxes, doorsteps, stoops, porches, balconies, patios, exterior doors, doorframes, and hardware incident thereto, screens and windows or other fixtures designed to serve a single separate interest, but located outside the boundaries of the separate interest, are exclusive use common area allocated exclusively to that separate interest.

(c) Notwithstanding the provisions of the declaration, internal and external telephone wiring designed to serve a single separate interest, but located outside the boundaries of the separate interest, is exclusive use common area allocated exclusively to that separate interest.