The Planning and Zoning Commission shall have only the following powers and duties:
1. Administrative Review. The Commission shall have powers to recommend the boundaries of various original districts and appropriate regulations and restrictions to be enforced therein, to hold public hearings concerning various zoning restrictions and to recommend to the City Council amendments, supplements, changes or modifications of zoning ordinances adopted by the City. In addition, said Commission shall have all powers granted a zoning commission under Chapter 414 of the Code of Iowa. The review of site plans shall be considered one of the administrative review functions of the Planning and Zoning Commission.
2. Administrative Studies. The Commission where empowered by City Council shall have full power and authority to make, or cause to be made, such surveys, studies, maps, plans or charts of the whole or any portion of such City or of any land outside thereof which, in the opinion of the Commission, bears relation to a Comprehensive Plan and shall bring to the attention of the City Council and may publish its studies and recommendations.
3. Division of Property Review. All plans, plats or re-plats of subdivisions or re-subdivisions of land embraced in the City or adjacent thereto, laid out in lots or plats with the streets, alleys or other portions of the same intended to be dedicated to the public in such City, shall first be submitted to the Planning and Zoning Commission and its recommendations obtained before approval by the City Council.
4. Major Infrastructure Review. No plan for any major street, park, parkway, boulevard, trafficway, riverfront or other major public improvement affecting the Comprehensive Plan shall be finally approved by the City or the character of location thereof determined to the public in such City, until it is submitted to the Planning and Zoning Commission and its recommendations obtained before approval by City Council.