Pub. L. 85-584, tit. V, sec. 506

Sec. 506. The Commissioners of the District of Columbia, the Secretary of the Treasury, and the Secretary of the Interior are hereby authorized to delegate, from time to time, to their designated agent or agents, any power or function vested in them by this Act, except those powers and functions vested in them by sections 305 and 504 of this Act.