; and including such funds as may be necessary to support American overseas research centers: Provided, That funds appropriated herein are available for advance payments to independent contractors performing research services or participating in official Smithsonian presentations: Provided further, That the Smithsonian Institution may expend Federal appropriations designated in this Act for lease or rent payments, as rent payable to the Smithsonian Institution, and such rent payments may be deposited into the general trust funds of the Institution to be available as trust funds for expenses associated with the purchase of a portion of the building at 600 Maryland Avenue, SW, Washington, DC, to the extent that federally supported activities will be housed there: Provided further, That the use of such amounts in the general trust funds of the Institution for such purpose shall not be construed as Federal debt service for, a Federal guarantee of, a transfer of risk to, or an obligation of the Federal Government: Provided further, That no appropriated funds may be used directly to service debt which is incurred to finance the costs of acquiring a portion of the building at 600 Maryland Avenue, SW, Washington, DC, or of planning, designing, and constructing improvements to such building: Provided further, That any agreement entered into by the Smithsonian Institution for the sale of its ownership interest, or any portion thereof, in such building so acquired may not take effect until the expiration of a 30 day period which begins on the date on which the Secretary of the Smithsonian submits to the Committees on Appropriations of the House of Representatives and Senate, the Committees on House Administration and Transportation and Infrastructure of the House of Representatives, and the Committee on Rules and Administration of the Senate a report, as outlined in the explanatory statement described in section 4 of the Further Consolidated Appropriations Act, 2020 ( Public Law 116–94