Automobile rental establishments, as listed in Use Group 8, are permitted, provided that:

(a)        in C2 Districts, the number of automobiles that may be stored in such establishments shall not exceed 150 spaces;

(b)        in C4, C6 and C8 Districts, the number of automobiles that may be stored in such establishments shall not exceed 225 spaces; and

(c)        in M1, M2 and M3 Districts, the number of automobiles that may be stored in such establishments shall not exceed 300 spaces.