When, in any city of the first class, any real estate owned by or under the care, custody and control of the county park commission is included within or adjoins the location of an existing public road or street, the county park commission may dedicate so much of that real estate as it may determine to be for the public interest, to public use as a public road or street, by the adoption of an appropriate resolution, and by filing with the county clerk or register of deeds, as the case may be, a copy of the resolution and a map of so much of the real estate owned by, or under the care, custody and control of the county park commission, as may be necessary to show the part intended to be so dedicated. Such dedication shall not be made unless the governing body of the city in which the real estate is situate shall, by resolution, consent thereto.