om the conversion of an existing one- family dwelling, by the interior structural alteration thereof or by the addition of not more than 250 square feet of floor area thereto, into two or more dwelling units and all such newly created dwelling units are rental units. (Added by Ord. No. 157,220, Eff. 12/11/82.) (u) Senior Independent Housing / Assisted Living Care Housing / Housing Development Occupied By Disabled Persons. (Amended by Ord. No. 178,063, Eff. 12/30/06.) Except for Skilled Nursing Care Housing and Alzheimer’s / Dementia Care Housing, the number of parking spaces required for Senior Independent Housing, Assisted Living Care Housing, or a housing development occupied by disabled persons as set forth below, may be reduced to 50 percent of the number otherwise required by this subdivision if all of the following requirements are met: (1) Each dwelling unit or guest room in the development shall be occupied by at least one person who is disabled or 62 years of age or older, except for management or maintenance personnel who are required to live on the premises. For purposes of this paragraph, a disabled person is a person who has: (a) physical or mental disabilities, which seriously restricts that person from operating a motor vehicle; (b) is expected to be of long, continued and indefinite duration; (c) substantially impedes their ability to live independently; and (d) is of a nature that the ability to live independently could be improved by more suitable housing conditions. (2) There shall also be provided at least ten square feet of indoor recreation space and at least 50 square feet of usable open space for each dwelling unit in the development, both of which shall be available and accessible to all residents of the development. The open space may be located on the ground, on terraces or on rooftops, shall be landscaped or developed for active or passive recreation and may include roofed recreation areas, swimming pools, or unenclosed porches where not otherwise prohibited. The open space may include walkways, but shall not include land used for required front or side yards, private streets, driveways, passageways, parking, loading or service areas.