The planned district development approach is greatly encouraged. It is the intent of these regulations that subdivision review be carried out simultaneously with the review of planned district zoning applications under Chapter 1159 of the Zoning Ordinance. The subdivision regulations may be modified to the degree necessary to accomplish the objective and standards required for planned districts. Nothing within this section, however, shall exempt the developer from the requirements of subdivision plat approval as specified in this chapter. Subdivision regulations modified to the degree necessary to accomplish the objectives and standards required for planned districts must be approved by Council at the time of Council planned district approval.