; and (C) an identification of items of special congressional interest. 406. Except as otherwise specifically provided by law, not to exceed 50 percent of unobligated balances remaining available at the end of fiscal year 2019 from appropriations made available for salaries and expenses for fiscal year 2019 in this Act, shall remain available through September 30, 2020, for each such account for the purposes authorized: Provided , That a request shall be submitted to the House and Senate Committees on Appropriations for approval prior to the expenditure of such funds: Provided further , That these requests shall be made in compliance with reprogramming guidelines under section 405 of this Act. 407. No funds in this Act may be used to support any Federal, State, or local projects that seek to use the power of eminent domain, unless eminent domain is employed only for a public use: Provided , That for purposes of this section, public use shall not be construed to include economic development that primarily benefits private entities: Provided further , That any use of funds for mass transit, railroad, airport, seaport or highway projects, as well as utility projects which benefit or serve the general public (including energy-related, communication-related, water-related and wastewater-related infrastructure), other structures designated for use by the general public or which have other common-carrier or public-utility functions that serve the general public and are subject to regulation and oversight by the government, and projects for the removal of an immediate threat to public health and safety or brownfields as defined in the Small Business Liability Relief and Brownfields Revitalization Act ( Public Law 107–118 ) shall be considered a public use for purposes of eminent domain. 408. None of the funds made available in this Act may be transferred to any department, agency, or instrumentality of the United States Government, except pursuant to a transfer made by, or transfer authority provided in, this Act or any