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3202.3.1 Replace this section as follows:
3202.3.1 Awnings, canopies, marquees and signs. Awnings, canopies, marquees and signs shall be constructed so as to support applicable loads as specified in Chapter 16. Canopies shall be allowed only over entrance doorways and only for Occupancy Groups A, B, F-1, M, S-1, S-2 and R. Canopies may be constructed as awnings and with the same limitations except that:
1. The maximum width shall be 10 feet (3.048 m); and
2. The maximum extension over public sidewalk may be to a point 2 feet (0.61 m) from the curb; and
3. The outer column support shall be located in the outer one-third of the sidewalk.
3202.3.2 Replace this section as follows:
3202.3.2 Windows, balconies, architectural features and mechanical equipment.
A 3-foot (0.914 m) projection shall be permitted for bay and oriel windows when the clearance above grade is at least 10 feet (3.048 m) and the width of the sidewalk is greater than 9 feet (2.74 m). Where the sidewalk width is 9 feet (2.74 m) or less, the projection shall not exceed 2 feet (0.61 m).
For all other appendages, a 2-foot (0.61 m) projection is permitted when the clearance above grade is at least 10 feet (3.048 m). The projection may be increased 1 inch (25.4 mm) for each additional foot of clearance over 10 feet (3.048 m), to a maximum of 4 feet (1.219 m).
3202.3.4 Add the following after the first paragraph as follows:
A covered pedestrian walkway may be constructed over a street between buildings of only Types I-A and I-B construction. Permission from the Board of Supervisors and approval of the Department of Public Works and Planning Commission is required. The pedestrian walk-way shall comply with the following conditions:
1. The pedestrian walkway shall be equipped with an automatic sprinkler system. The supporting structure shall be three-hour fire-resistive construction. Columns located within 8 feet (2.438 m) of the curb, or otherwise vulnerable to vehicle impact, shall either be designed for such impact or protected from the impact.
2. The openings in the exterior walls of the buildings at the ends of the pedestrian walkway shall be protected by 1½ hour fire assemblies.
3203 Add a section as follows:
3203.1 General. Sidewalks shall be constructed in accordance with the Public Works Code.
Sidewalks over excavated areas shall be supported on noncombustible construction with 3-hour fire-rated protection. The sidewalk shall be waterproofed by use of a hot mopped asphalt membrane or other approved means.
3203.2 Openings in Sidewalks.
3203.2.1 Sidewalk trapdoor. Every basement extending under the sidewalk shall have an approved sidewalk trapdoor. The minimum size of the trapdoor opening shall be 4 feet by 4 feet (1.219 m by 1.219 m). However, trapdoors shall not be required where the basement is provided with an automatic sprinkler system.
3203.2.2 Sidewalk elevators. All openings hereafter constructed in sidewalks for sidewalk elevators shall be located in the outer half of the sidewalks, next to the curb. The outer edges of the openings shall be not more than 30 inches (762 mm) from the outer line of the curb. The length of the sides of the openings at right angles to the curb shall not exceed one-half of the width of the sidewalk and in no case shall it exceed 5 feet (1.524 m).
3203.2.3 Any other purpose. Openings on the sidewalks for any other purpose, if placed outside the property line, shall be covered with approved gratings having a maximum opening between bars of ½ inch (12.7 mm), or with covers having a rough surface, and rabbeted flush with the sidewalk. When a cover is placed in any sidewalk, it shall be placed as near as practicable to the line of the curb. All spaces under sidewalks shall be thoroughly ventilated.
3203.2.4 Framing. All framing supporting only the sidewalk opening shall be of noncombustible material.
3203.2.5 Guards. Metal guards will be required for openings in sidewalks in accordance with the Police Code.
3203.3 Electrical Transformers. No portion of any electrical transformer pad shall be constructed, nor electrical transformer installed on the surface of any portion of any public sidewalk.