; 22 U.S.C. 290h et seq.), $30,000,000, to remain available until September 30, 2020, of which not to exceed $2,000 may be available for representation expenses: Provided , That funds made available to grantees may be invested pending expenditure for project purposes when authorized by the Board of Directors of the United States African Development Foundation (USADF): Provided further, That interest earned shall be used only for the purposes for which the grant was made: Provided further, That notwithstanding section 505(a)(2) of the African Development Foundation Act ( 22 U.S.C. 290h–3(a)(2) ), in exceptional circumstances the Board of Directors of the USADF may waive the $250,000 limitation contained in that section with respect to a project and a project may exceed the limitation by up to 10 percent if the increase is due solely to foreign currency fluctuation: Provided further, That the USADF shall submit a report to the appropriate congressional committees after each time such waiver authority is exercised: Provided further , That the USADF may make rent or lease payments in advance from appropriations available for such purpose for offices, buildings, grounds, and quarters in Africa as may be necessary to carry out its functions: Provided further , That the USADF may maintain bank accounts outside the United States Treasury and retain any interest earned on such accounts, in furtherance of the purposes of the African Development Foundation Act: Provided further , That the USADF may not withdraw any appropriation from the Treasury prior to the need of spending such funds for program purposes. Department of the treasury International affairs technical assistance For necessary expenses to carry out the provisions of section 129 of the Foreign Assistance Act of 1961, $30,000,000, to remain available until September 30, 2021, of which not more than $6,000,000 may be used for administrative expenses: Provided , That amounts made available under this heading may be made available to contract for services as