BETHESDA, MD. — Donohoe Construction Co. has begun construction on the Hilton Garden Inn Bethesda, located on Waverly Street in Bethesda. The hotel, with 216 rooms, as restaurant and lounge, a fitness center, a pool, a business center and meeting space, will be the new centerpiece of the Air Rights Center, a 715,000-square-foot complex of three office towers complemented by retail space, structured parking and restaurants. Upon completion in late 2009, Donohoe Hospitality Services will manage the hotel. Brennan Beer Gorman & Monk is serving as the project architect.