If by reason of any grant to any municipality, political subdivision, or district, or by reason of any charter of any city or county, any of the powers and duties which are granted to or imposed upon the commission in relation to lands described in this article can not be exercised by the commission within any municipality, political subdivision, or district, or any portion thereof, then such powers and duties are to that extent granted to and imposed upon such municipality, political subdivision or district, to be exercised and performed by, or under the authority of, the legislative or other governing body thereof, but where any such lands have been granted to any municipality or other governmental agency in trust or for limited purposes or upon conditions, nothing in this chapter shall affect or extend such trusts or purposes or modify or affect such conditions.