; rental of buildings in the District of Columbia; restoration of leased premises; moving governmental agencies (including space adjustments and telecommunications relocation expenses) in connection with the assignment, allocation, and transfer of space; contractual services incident to cleaning or servicing buildings, and moving; repair and alteration of federally owned buildings, including grounds, approaches, and appurtenances; care and safeguarding of sites; maintenance, preservation, demolition, and equipment; acquisition of buildings and sites by purchase, condemnation, or as otherwise authorized by law; acquisition of options to purchase buildings and sites; conversion and extension of federally owned buildings; preliminary planning and design of projects by contract or otherwise; construction of new buildings (including equipment for such buildings); and payment of principal, interest, and any other obligations for public buildings acquired by installment purchase and purchase contract; in the aggregate amount of $8,634,574,000, of which— (1) $275,900,000 shall remain available until expended for construction and acquisition (including funds for sites and expenses, and associated design and construction services) as follows: (A) $275,900,000 shall be for the Calexico, California, Calexico West Land Port of Entry; Provided , That each of the foregoing limits of costs on new construction and acquisition projects may be exceeded to the extent that savings are effected in other such projects, but not to exceed 10 percent of the amounts included in a transmitted prospectus, if required, unless advance approval is obtained from the Committees on Appropriations of a greater amount; (2) $679,934,000 shall remain available until expended for repairs and alterations, including associated design and construction services, of which— (A) $286,344,000 is for Major Repairs and Alterations; (B) $312,090,000 is for Basic Repairs and Alterations