Global accounting firm Grant Thornton signed a 36,100-square-foot renewal with Piedmont Office Realty Trust at 60 Broad St. (pictured) in Manhattan. The firm will continue to occupy the entire 24th and 25th floors for another five years.The 39-story, 1 million-square-foot office tower, renovated in 2003, is located in the Financial District submarket. The property is fully occupied. Mitchell Barnett, David Malawer and Andrew Peretz of Cushman & Wakefield Inc. represented Grant Thornton. Piedmont Office Realty Trust was represented by Anthony Stapleton, Eric Sarner and Sheila Nayson of Cogswell Realty Group L.L.C. and George Wells of Piedmont.