Ordinance amending the Planning Code to 1) allow neighborhood-serving Social Service and Philanthropic Facility uses in Chinatown Mixed Use Districts with conditional use authorization; 2) change the provision for abandonment of a use that exceeds a use size maximum in Chinatown Mixed Use Districts; 3) allow re-establishment of a nonconforming use size in Chinatown Mixed Use Districts under certain circumstances; 4) change the use size limit and use size maximum in the Chinatown Community Business District; 5) exempt Institutional Community uses and Legacy Business Restaurants in Chinatown Mixed Use Districts from use size limits; 6) allow lot mergers under certain conditions in the Polk Street Neighborhood Commercial District; and 7) exclude the portion of Powell Street south of Union Street from the North Beach Financial Service, Limited Financial Service, and Business or Professional Service Subdistrict; affirming the Planning Department’s determination under the California Environmental Quality Act; and making findings of consistency with the General Plan and the eight priority policies of Planning Code Section 101.1, and public necessity, convenience, and general welfare findings pursuant to Planning Code, Section 302.