In 2010, federal agencies reported about 3.35 billion square feet of building space to the FRPP: 79 percent of the reported building space was federally owned, 17 percent was leased, and 4 percent was otherwise managed. The data indicated that the agencies used most of the space-about 64 percent-as offices, warehouses, housing, hospitals, and laboratories. The five agencies we reviewed-GSA, DOE, Interior, VA, and USDA-reported owning or leasing more than 866 million square feet of building space, or about 25 percent of the total reported square footage for all agencies.