The Planning Commission shall within 30 days after the public hearing review the preliminary development plan to determine if it is consistent with the intent and purpose of this Zoning Code; whether the proposed development advances the general welfare of the community and neighborhood; and whether the benefits, combination of various land uses, and the interrelationship with the land uses in the surrounding area justify the deviation from standard district regulations. The Commission's approval in principle of the preliminary development plan shall be necessary before an applicant may submit a final development plan. Approval in principle shall not be construed to endorse a precise location of uses, configuration or parcels, or engineering feasibility. The Planning Commission may seek assistance in making its recommendation from the County or Regional Planning Commission or any other appropriate source.