The purpose of this subdivision shall be to enable municipalities and counties to join in the formation of regional planning commissions whose duty it shall be to prepare a coordinated plan for the development of a region, taking into account present and future needs with a view toward encouraging the most appropriate use of land, such as for agriculture, forestry, industry, commerce, and housing; the facilitation of transportation and communication; the proper and economic location of public utilities and services; the development of adequate recreational areas; the promotion of good civic design; and the wise and efficient expenditure of public funds. The aforesaid plan shall be made in order to promote the health, safety, morals and general welfare of the region and its inhabitants. To promote these purposes the office of planning and development shall delineate planning regions for the state so that each municipality of the state will fall within a delineated region and shall have the opportunity of forming or joining the regional planning commission for that planning region. In determining these regions the office shall consider such factors as community of interest and homogeneity, existing metropolitan and regional planning agencies, patterns of communication and transportation, geographic features and natural boundaries, extent of urban development, relevancy of the region for provision of governmental services and functions and its use for administering state and federal programs, the existence of physical, social and economic problems of a regional character, and other related characteristics. To accommodate changing conditions, the office may adjust the boundaries of the planning regions, after consultation with the respective regional planning commissions.