In computing the number of spaces required in Section 1157.04, the following rules shall govern:
(a) "Floor area" means the gross floor area of the specified use.
(b) Where fractiona1 spaces result, the parking spaces required shall be construed to be the next highest number.
(c) In the case of a use not specifically mentioned above, the requirements for off- street parking facilities for a use which is so mentioned and to which said use is similar, as determined by Planning Commission, shall apply.
(d) In the case of mixed uses, the total requirements for off-street parking facilities shal1 be the sum of the requirements for the various uses, computed separately. Off-street parking facilities for one use, shall not be considered as providing required parking facilities for any other use.
(e) Whenever a building or use constructed or established after the effective date of this Zoning Ordinance (April 3, 1985) is changed or enlarged in floor area, number of dwelling units, seating capacity or otherwise, so as to create a need for an increase in the number of required parking spaces, such increase in parking spaces shall be computed on the basis of the enlargement or change in compliance with the parking requirements set forth herein.
(f) Whenever a building or use which existed prior to the effective date of this Zoning Ordinance (April 3, 1985) is changed or enlarged in floor area, number of dwelling units, seating capacity or otherwise, so as to create a need for an increase in the number of required parking spaces, such increase in parking spaces shall be computed on the basis of the enlargement or change in compliance with the parking requirements set forth herein.