Trustee System Fund and amounts herein appropriated shall be available in such amounts as may be necessary to pay refunds due depositors: Provided further, That, notwithstanding any other provision of law, fees deposited into the Fund as discretionary offsetting collections pursuant to section 589a of title 28, United States Code (as limited by section 589a(f)(2) of title 28, United States Code), shall be retained and used for necessary expenses in this appropriation and shall remain available until expended: Provided further, That to the extent that fees deposited into the Fund as discretionary offsetting collections in fiscal year 2024, net of amounts necessary to pay refunds due depositors, exceed $257,000,000, those excess amounts shall be available in future fiscal years only to the extent provided in advance in appropriations Acts: Provided further, That the sum herein appropriated from the general fund shall be reduced (1) as such fees are received during fiscal year 2024, net of amounts necessary to pay refunds due depositors, (estimated at $230,000,000) and (2) to the extent that any remaining general fund appropriations can be derived from amounts deposited in the Fund as discretionary offsetting collections in previous fiscal years that are not otherwise appropriated, so as to result in a final fiscal year 2024 appropriation from the general fund estimated at $0. SALARIES AND EXPENSES, FOREIGN CLAIMS SETTLEMENT COMMISSION For expenses necessary to carry out the activities of the Foreign Claims Settlement Commission, including services as authorized by section 3109 of title 5, United States Code, $2,600,000. FEES AND EXPENSES OF WITNESSES For fees and expenses of witnesses, for expenses of contracts for the procurement and supervision of expert witnesses, for private counsel expenses, including advances, and for expenses of foreign counsel, $270,000,000, to remain available until expended, of which not to exceed $16,000,000 is for construction of buildings for protected witness safesites