While the City Attorney’s Office looks into the possible impacts to San Francisco from a California Supreme Court ruling that will prevent Los Angeles from enforcing its city mandates for affordable rental housing, Board of Supervisors President David Chiu put together a resolution “urging” the state legislation to act on behalf of low-income residents, not landlords.  The Costa Hawkins Act allows landlords to set initial rental rates; the recent ruling in the Palmer/Sixth Street Properties vs. City of Los Angeles said a city law requiring that some units be priced below market rates violated the state law.  Chiu’s resolution, which will come before the board on Tuesday, requests that California lawmakers amend Costa Hawkins to exempt local affordable-housing ordinances.