The commission may require one or more of the following in instances where the proposed development appears to create special problems of traffic, landscaping or economic feasibility:
A. Circulation studies, prepared by a traffic engineer, showing the movement of vehicular and pedestrian traffic within the planned development, and to and from existing thoroughfares. Special engineering features and/or traffic regulation devices needed to facilitate or ensure safety of circulation may be required;
B. A landscaping and tree planting plan, prepared by a landscape architect;
C. An economic feasibility report or market analysis, prepared by a qualified economist. (Ord. 1000 § 52.55(I), 1955)