Waldorf Astoria, known for effortless luxury rooted in elegant service, has arrived in Washington, D.C. in one of Pennsylvania Avenue’s most iconic buildings. The nation’s Old Post Office, an architectural treasure noted for its historic grandeur and listed on the National Registry of Historic Places, is newly reimagined as Waldorf Astoria Washington DC, the new home for the most consequential events, groundbreaking meetings, and unforgettable experiences.  Events: With 38,000 square-feet of event space, Waldorf Astoria Washington DC offers unique options for prestigious meetings and social gatherings, including the opulent 13,200-square-foot ballroom which can accommodate up to 1,300 guests for a standing reception.