AN ORDINANCE AMENDING SECTION 11 OF THE ZONING PLAN COMPRISING PORTION OF THE DISTRICT OF ERMITA, UNDER SECTION 2 OF ORDINANCE NO. 2830, OTHERWISE KNOWN AS THE ZONIFICATION ORDINANCE, AS AMENDED, BY CONVERTING THE WHOLE BLOCK BOUNDED BY LUIS GUERRERO STREET, ALHAMBRA STREET, T. W. KALAW STREET AND U. N AVENUE, FROM CLASS ''A'' RESIDENTIAL ZONE TO COMMERCIAL ZONE.