405.2 Revise this section as follows:
405.2 Repairs to damaged buildings. Repairs to damaged buildings shall comply with this section. Unless otherwise approved by the Building Official, all structural damage shall be repaired. Repairs to buildings or structures which have sustained substantial structural damage to lateral force resisting elements shall comply with the minimum lateral force design requirements of Section 304.4 or with the code under which the building or structure was designed, whichever is more restrictive.
Damage may be caused by events or a combination of events, including, but not limited to, fire, explosion, structural pest or wood-destroying organism attack, earthquake, wind storm, vehicular impact, ground subsidence or failure, or the collapse or dislodgement of any portion of any adjacent building or structure. The removal or alteration of structural elements as part of the work described in an approved building permit application shall not be considered to be “damage.”
405.2.1.2 Add the following section:
405.2.1.2 Other damage. For damage less than substantial structural damage that is not Disproportionate Earthquake Damage, repairs shall be allowed that restore the building to its predamage state, based on material properties and design strengths applicable at the time of original construction. New structural members and connections used for this repair shall comply with the detailing provisions of this code for new buildings of similar structure, purpose and location.
405.2.2 Add the following as a second paragraph:
405.2.2 Disproportionate earthquake damage.
Permit applications for required rehabilitation work shall be submitted to the Department within one year after the earthquake, and the work shall be completed as specified in Table B of San Francisco Building Code Section 106A.4.4.
405.2.3.1 Revise this section as follows:
405.2.3.1 Evaluation. The building shall be evaluated by a registered design professional, and the evaluation findings shall be submitted to the code official within 60 days of completion of the evaluation. The evaluation shall establish whether the damaged building, if repaired to its predamage state, would comply with the provisions of this code for wind and earthquake loads. Evaluation for earthquake loads shall be required if the substantial structural damage was caused by or related to earthquake effects or if the building is in Seismic Design Category C, D, E or F.
Wind loads for this evaluation shall be those prescribed in San Francisco Building Code Section 1609. Earthquake loads for this evaluation, if required, shall be according to section 304.4.