1. The standard maximum height for main buildings shall be thirty feet; provided, that vertical sidewalls and columns may not exceed twenty-two feet; and provided further, that these standard maximum heights may be increased, but in no event to exceed thirty-four feet for main buildings nor to exceed twenty-eight feet for vertical sidewalls and columns, as follows:

2. Accessory structures: see chapter 17.40.

3. Detached garages: see chapter 17.40.

4. Consistent with the sidewall height limit for the R-1A zone, dormers that exceed or are otherwise built above the sidewall height limit for the structure, as measured from the extension of the eave line across the width of the dormer, shall be developed consistent with the following standards (see figures 17.32.040-1a (Dormers) and 17.32.040-1b (Excessive Dormers)).

a. The maximum combined length of all dormers on a side or elevation of a building shall not exceed fifty percent of the total length of the respective side or elevation of the building to which they are associated (see figure 17.32.040-1b (Excessive Dormers)).

b. The face of the dormer shall be a minimum of two feet below the ridge line (see figure 17.32.040-2 (Dormer Height and Placement)).

1. Structures, open on all sides, with substantially open roofs (e.g., trellis) (see figure 17.32.040-3 (Substantially Open Roof)), with the following provisions:

a. No more than one side of the structure shall be attached to the main building and no more than one side of the structure may be enclosed by small structural features (e.g., outdoor kitchens/barbeques, fire pits/fireplaces, cabinets); provided, that on the side with the structural feature at least fifty percent of the side is still open (see figure 17.40.040-2 (Attached Trellis Exempt from Floor Area Requirement); or

2. Roofed areas completely open on two or more sides up to five percent of the maximum allowed floor area for the lot plus five hundred square feet (e.g., awning, patio cover, covered walk).

1. Main building, interior, and corner lots: sixty feet minimum; provided, however, on lots of record prior to adoption of Ordinance No. 146 (April 16, 1946) with a depth of less than two hundred feet, the front and rear yards shall each be thirty percent of the lot depth with a minimum of thirty feet; provided further, where main building heights are between thirty feet and thirty-four feet, the front and rear yards shall be increased by a ratio of five feet for each one-foot increase in height.

2. Accessory structures: as provided in chapter 17.40.

3. The property owned by the City and County of San Francisco, known as the Hetch Hetchy property, over which the owner of adjacent property with contiguous frontage has reserved surface rights, may be utilized by the adjacent property owner for setback calculation purposes. The adjacent property owner may calculate setbacks to the original property line prior to the acquisition by the City and County of San Francisco, or, in the case of properties subdivided after that date, to the centerline of the Hetch Hetchy property.

4. Second Dwelling Units. As provided in chapter 17.52.

1. The property owned by the City and County of San Francisco, known as the Hetch Hetchy property, over which the owner of adjacent property with contiguous frontage has reserved surface rights, may be utilized by the adjacent property owner for setback calculation purposes. The adjacent property owner may calculate setbacks to the original property line prior to the acquisition by the City and County of San Francisco, or, in the case of properties subdivided after that date, to the centerline of the Hetch Hetchy property.

2. Second Dwelling Units. Minimum side yard requirements are as provided in chapter 17.52.

1. There is no limitation on the maximum number of kitchens for the main dwelling.

2. One kitchen may be within an approved second dwelling unit that is located within the main dwelling building setback lines. (Ord. 627 § 1, 2017; Ord. 591 §§ 2, 3, 2010; Ord. 582 § 1 (Exh. A (part)), 2009)