For all purposes herein provided for such counties, the commission in its own name may make all necessary rules, regulations, commitments, contracts, agreements or other provisions and apply for and receive in the name of the county or its own name, either directly or through any other body, organization, or agent, any assistance or money or obtain a loan or loans, and pledge the property acquired for any moneys that may be available from the United States government or the state in carrying out the purposes of sections 64.350 to 64.390 and shall cooperate with any city or county and with any official or unofficial body of the federal government, state of Missouri or other states, or counties within or without the state, in the preparation and carrying out of any plans or developments or acquisitions of property whenever such systems or improvements may be of benefit to the people of such county; provided, however, that no real estate shall be acquired within the territory embraced in any public park district already organized and authorized by law, except with the consent of the official body in charge thereof.