(a) Off-street parking and loading facilities in existence on the effective date of this Ordinance and located on the same lot as the building or use served shall not hereafter be reduced below, or if already less than, shall not be further reduced below, the requirements for a similar new building or use under the provisions of this Ordinance.
(b) Any area once designated as required off-street parking or loading shall never be changed to any other use unless and until equal facilities are provided elsewhere.