The City Plan Commission shall have power to control the design and location of works of art which are, or may become, the property of the City; the plan, design and location of public buildings, harbors, bridges, viaducts, street fixtures and other structures and appurtenances having to do with the beauty and convenience of the City; the removal, relocation, extension and platting of streets, parks and other public places, and of new areas; and the preparation of plans for the future physical development of the City.