; for all necessary expenses for surveys and studies, construction, operation, and general and administrative support in connection with facilities and activities under the care of the Architect of the Capitol, including the Botanic Garden; for electrical substations of the Capitol, Senate and House office buildings, and other facilities under the jurisdiction of the Architect of the Capitol; for furnishings and office equipment; for official reception and representation expenses of not more than $5,000, to be expended as the Architect of the Capitol may approve