Chapter 1183 inclusive, shall apply to all Districts. Except as provided in Section 1183.13, no building or structure shall be erected, substantially altered, or its use changed unless permanently maintained off-street parking and loading spaces have been provided in accordance with the provisions of this Ordinance.
(a) The provisions of this Chapter, except where there is a change of use, shall not apply to any existing building or structure. Where the new use involves no additions or enlargements, there shall be provided as many of such spaces as may be required by this Ordinance.
(b) Whenever a building or structure constructed after the effective date of this Zoning Code (Ordinance 2305, passed December 21, 1965) is changed or enlarged in floor area, number of employees, number of dwelling units, seating capacity or otherwise to create a need for an increase of ten percent (10%) or more in the number of existing parking spaces, additional parking spaces shall be provided on the basis of the enlargement or change.
(c) Whenever a building or structure existing prior to the effective date of this Zoning Code (Ordinance 2305, passed December 21, 1965) is enlarged to the extent of fifty percent (50%) or more in floor area or in the area used, number of employees, number of housing units, seating capacity, or otherwise, said building or structure shall then and thereafter comply with the full parking requirements set forth herein.