The plan commission shall have the following powers:
(A) To prepare and recommend to the council a comprehensive plan of public improvements looking to the present and future development of the city, such plan after its adoption by the council, to be known as the official plan of the city. The commission may thereafter, from time to time, recommend any changes in the official plan. The plan may include reasonable requirements in reference to streets, alleys and public grounds in unsubdivided lands within the corporate limits and in contiguous territory outside of and distant not more than one and one-half (11/2) miles from such limits and not included in any city, village, or incorporated town, such requirements to be effective whenever such lands shall be subdivided after the adoption of the plan.
(B) To prepare and recommend to the council and board of local improvements, from time to time, plans for specific improvements in pursuance of the official plan.
(C) To give aid to the officials of the city charged with the direction of projects for improvements embraced within the official plan, to further the making of such improvements and generally to promote the realization of the official plan. (1950 Code)