D.C. Code § 2-1104

The Congress further declares that the officers, departments, agencies, and instrumentalities of the executive branch of the federal government and the Mayor of the District of Columbia and the other officers, agencies, and instrumentalities of the District of Columbia, and other agencies of government within the Washington metropolitan region are invited and encouraged to engage in an intensive study of the final report and recommendation of the Joint Committee on Washington Metropolitan Problems with a view to submitting to the Congress the specific recommendations of each of the agencies of government specified.