Unveiled in June 2018, the new 31st-floor Observation Deck atop the CEB Tower in Rosslyn, Va., the tallest building inside the Beltway, is now the highest public space in the metropolitan D.C. area. Designed by Legends, the firm behind projects including One World Observatory in New York City and OUE Skyspace in Los Angeles, the 12,000-square-foot space includes a private event venue for 250, open-air terrace and cafe.