As of fiscal year 2015, the federal judiciary paid over $1 billion in rent to the General Services Administration (GSA) for court-related space. GAO previously found that the judiciary faced challenges managing increasing space and rental costs, including for the U.S. Courts of Appeals. GAO was asked to review the judiciary's space reduction efforts, focusing on appellate space. This report examines: (1) the policies and practices that guide space use decisions for federal courts of appeals; (2) trends in rent, space occupied, and use of appellate space; and (3) actions taken to reduce or improve use of appellate space, including any related challenges and the extent to which the judiciary has shared information to support such efforts. GAO reviewed statutes, GSA and judicial policies and guidance, and information on projects to reduce appellate space; analyzed GSA's billing data on the judiciary from fiscal years 2009 through 2015; and visited 7 appellate courthouses, selected to include those in diverse locations with a variety of caseloads. GAO also interviewed officials in all 12 regional judicial circuits, AOUSC (the judiciary's administrative arm), GSA's central office, and GSA's 11 regional offices.