High Quality Content by WIKIPEDIA articles! Constitution Center (formerly known as the David Nassif Building) is an office building located at 400 7th Street SW in Washington, D.C. It is 140 feet (43 m) high and has 10 floors. Covering an entire city block, it is the largest privately owned office building in the District of Columbia. Current tenants include the United States Securities and Exchange Commission and the Office of the Comptroller of the Currency.