AN ORDINANCE AMENDING SECTION 4 OF THE ZONING PLAN EMBRACING PORTIONS OF THE DISTRICTS OF TONDO, STA. CRUZ, BINONDO, QUIAPO AND SAMPALOC, UNDER SECTION 2 OF ORDINANCE NO. 2830, OTHERWISE KNOWN AS ZONIFICATION ORIDNANCE, AS AMENDED, BY CONVERTING THAT PORTION OF GASTAMBIDE STREET, FROM SAN ANTON TO LEGARDA, FROM RESIDENTIAL "B" ZONE TO "COMMERCIAL" ZONE.