Approval of Preliminary Plan. When all comments and recommendations from appropriate agencies or departments have been received or within 45 days after receiving the application as provided for in this title, whichever date shall occur first, the City staff shall place the preliminary plan on the agenda of the next scheduled meeting of the Planning Commission and notify the applicant of the meeting date and time. Following consideration of the preliminary plan, the replies from other agencies and departments and such other testimony offered, the Planning Commission shall schedule a hearing within 45 days. At the conclusion of the hearing, the Planning Commission shall approve, conditionally approve, disapprove for cause or, when further information is required, postpone a decision on the preliminary plan. Unless appealed, the decision of the Planning Commission shall become effective on the thirty-first day after rendered. The approval or conditional approval is valid for two years from the effective date of that approval.