Elec. Code, § 7403

(a) In the City and County of San Francisco, the county central committee shall be elected from the two Assembly districts located in the city and county and shall consist of 25 members. Whichever of the two Assembly districts consists of the majority of the registered Republicans in the city and county shall elect 13 members plus one additional member for every 4 percent of the registered Republicans in the district above a majority of the registered Republicans in the city and county. The remainder of the members shall be elected from the Assembly district that consists of the minority of the registered Republicans in the city and county.

(b) Both of the following shall apply for purposes of this section:

(1) “Registered Republican” means any voter in the city and county who has expressed a preference for the Republican Party on his or her affidavit of registration pursuant to Sections 2150, 2151, and 2152 as of the 154th day prior to the first direct primary election after any redistricting of Assembly district boundaries.

(2) The City and County of San Francisco Department of Elections, or any comparable successor agency, shall calculate the percentage of the total registered Republicans in each Assembly district in the city and county.

(c) Notwithstanding any other provision of law, for the June 5, 2012, statewide primary election, signers of nomination papers for candidates for the county central committee shall be voters who disclosed a preference, pursuant to Section 2151, for the Republican Party and who are residents in the County of San Francisco, regardless of whether they are residents of the district in which the candidate is to be voted on.