Less than half of the over 11,500 acres on the old Gettysburg Battlefield have been preserved for posterity thus far. The Civil War Trust (a division of the American Battlefield Trust) and its partners have acquired and preserved of the battlefield in more than 30 separate transactions since 1997. Some of these acres are now among the 4,998 acres of the Gettysburg National Military Park. In 2015, the Trust made one of its most important and expensive acquisitions, paying $6 million for a four-acre parcel that included the stone house that Confederate Gen. Robert E. Lee used as his headquarters during the battle. The Trust razed a motel, restaurant and other buildings within the parcel to restore Lee's Headquarters and the site to their wartime appearance, adding interpretive signs. It opened the site to the public in October 2016.