The Commission may sell or otherwise dispose of any playground and recreational facilities no longer needed for public use and use the proceeds of the sale or other disposition for the construction, acquisition, or improvement of any other playground or recreational facilities in the metropolitan district. The Commission also may exchange with the United States of America, the State of Maryland, or any other public body or agency any land held or acquired by the Commission in its own name or in the name of the State of Maryland for playground or recreational facilities, except park lands acquired by the Commission pursuant to an agreement with the National Capital Planning Commission, for any other land held or acquired by the United States, the State of Maryland, or any other public body or agency, and, in the sole discretion of the Commission, deemed to be as more suitable for playground and recreational purposes than the land held by it and offered in exchange. The exchange may be accompanied by a partial cash consideration moving either to or from the Commission; and any exchange, effected as aforesaid, shall be deemed and is declared to be an acquisition of land for the public uses hereinabove in this title defined.