A private organization (except a political party or committee constituted for the election of federal officials), whether or not organized for profit and whether or not any of its income inures to the benefit of any person, that performs services or conducts activities in the United States Capitol Buildings or Grounds is subject to a special audit of its accounts for each year in which it performs those services or conducts those activities. The Comptroller General shall conduct the audit and report the results of the audit to the Senate and the House of Representatives.