In C1, C2 or C3 Districts, the City Planning Commission may permit automotive service stations, auto repair establishments, public parking garages or public parking lots. As a condition for permitting such use, the Commission shall make the following findings:

(a)        that such use is so located as to draw a minimum of vehicular traffic to and through local streets in nearby residential areas;

(b)        that such use has adequate reservoir space at the vehicular entrance to accommodate a minimum of 10 cars or 20 percent of the spaces so provided, whichever amount is less; and

(c)        that, where roof parking is permitted, such roof parking is so located as not to impair the essential character or future use or development of adjacent areas.

The Commission may prescribe appropriate conditions and safeguards to minimize adverse effects on the character of the surrounding area, including limitations on signs or requirements for the shielding of floodlights or for setback of any roof parking areas from lot lines.