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Ordinance No. Page 6 of 12 existing living area that is converted to an accessory dwelling unit or to a portion of an accessory dwelling unit. Height of the attached accessory dwelling unit is measured vertically from the average elevation of the natural grade or finished grade, whichever is lower, of the ground covered by the accessory dwelling unit to the highest point of the structure including parapet or to the coping of a flat roof, to the deck line of a mansard roof, or to the mean height between eaves and ridges for a hip, gable, or gambrel roof. Accessory dwelling units are limited to two stories. An accessory dwelling unit proposed on the second story shall not exceed 25 feet in height and shall meet the objective standards for second-story accessory dwelling units identified in Section 18.106.060(C)(2). B. The gross floor area of an attached accessory dwelling unit shall not exceed 50% of the gross floor area of the existing main dwelling unit, with a maximum increase in floor area of 850 square feet if the accessory dwelling unit is a studio or one-bedroom unit or 1,000 square feet if the accessory dwelling unit is two or more bedrooms. Accessory dwelling units that result from conversion of existing space may exceed these size limits. The gross floor area of the existing main dwelling unit is to be calculated based on the size of the unit prior to the accessory dwelling unit/conversion. In no case shall this requirement necessitate an accessory dwelling unit to be less than: (1) a 150 - square-foot efficiency unit; (2) 850 square feet if the accessory dwelling unit is a studio or one-bedroom unit; or (3) 1,000 square feet if the accessory dwelling unit is two or more bedrooms. C. An accessory dwelling unit that does not meet all of the Statewide Exemption Accessory Dwelling Unit Standards defined in Section 18.106.020 shall comply with applicable floor area ratio maximums, minimum open space requirements, and any other applicable d evelopment regulations established by this section and the zoning district or planned unit development in which the property is located. D. Except as modified by this chapter, all other regulations embodied in the zoning of the property for main dwellings shall apply to the development of attached accessory dwelling units. (Ord. 1885 § 2, 2003; Ord. 2080 § 2, 2013; Ord. 2161 § 1, 2017; Ord. 2213 § 2, 2021; Ord. 2277, 5/7/2024) § 18.106.045. Standards for detached accessory dwelling units —Height limitations, setbacks, open space, and other regulations. Detached accessory dwelling units shall meet the requirements in Section 18.106.060 of this chapter and the following requirements: A. Detached accessory dwelling units shall not exceed 16 feet in height, except that: (1) an accessory dwelling unit that is the result of the conversion of an existing accessory structure may retain the height of the accessory structure even if the structure is greater than 16 feet; and (2) detached accessory structures greater than 16 feet in height may be proposed as part of a new planned unit development. Height for all detached accessory dwelling units is measured from the lowest grade adjacent to the structure to the highest ridge or top of the structure; (3) a detached accessory dwelling unit on an existing or proposed single-family or multi-family dwelling unit that is within one-half mile walking distance of a major transit stop or high quality transit corridor, as defined in Section 21155 of the Public Resources Code shall not exceed 18 feet in height plus an additional two feet in height to accommodate a roof pitch on the accessory dwelling unit that is aligned with the roof pitch of the primary dwelling unit; and (4) a detached accessory dwelling unit on a lot with an existing or proposed multi- family multi-story dwelling shall not exceed 18 feet in height. B. All detached accessory dwelling units shall be located a minimum of four feet from side and rear property lines, except in the case where an accessory dwelling unit Page 76 of 348