WASHINGTON, DC-The leasehold on an East End building, Carroll Square, has traded for $121.4 million. The 178,000-square-foot, class A building, located at 975 F St., NW, is being acquired by GLL Partners from Seaton Benkowski & Partners. GLL Partners is assuming an existing loan on the 10-story property. HFF’s Stephen Conley, Jim Meisel, Dek Potts and Andrew Weir represented the seller in the transaction.