Each residential unit within a specific plan development shall have at least 200 cubic feet of usable, enclosed, weatherproofed and lockable storage space for the exclusive use of the unit owner. Such space must be over and above normal interior storage space such as guest, linen or clothes closets or food pantries. The location dimensions and usability of such space shall be determined by the Community Development Department, except that private storage space shall not be divided between two or more locations. If such space is located within a common area within the project, the property owner's association shall be responsible for the care and maintenance of the exterior surface of the space. Private storage space can be waived by the City Council at the request of the applicant providing a reasonable alternative is proposed.